Specification for flanges and bolting for pipes, valves and fittings
BS 10:2009
raising standards worldwide™
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BSI British Standards
BS 10:2009 BRITISH STANDARD
Publishing and copyright informationThe BSI copyright notice displayed in this document indicates when the document was last issued.
© BSI 2009
ISBN 978 0 580 61296 1
ICS 23.040.60
The following BSI references relate to the work on this standard: Committee reference PSE/15 Draft for comment 08/30174939 DC
Publication historyFirst published as BS 10-1:1947, BS 10-2:1926, BS 10-3:1929, BS 10-4:1931
and BS 10-5:1932First published as BS 10, December 1962Second (present) edition, April 2009
Amendments issued since publication
Date Text affected
BRITISH STANDARD
© BSI 2009 • i
BS 10:2009
ContentsForeword iii1 Scope 12 Normative references 13 Design temperature and pressure 24 Designation 25 Flange dimensions 26 Flange materials 37 Attachment of flanges 48 Hydraulic testing of flange joints 49 Certification 410 Low temperature flanges and bolting 6
AnnexesAnnex A (informative) Information to be supplied by the purchaser 33Annex B (informative) Minimum requirements of steel to be used for flanges in Table A to Table H 34Annex C (normative) Bolts and nuts 37
Bibliography 41
List of figuresFigure 1 – Shaped stud bolt (see C.4) 25Figure 2 – Application diagram for bolts and stud-bolts: carbon and flanges 26Figure 3 – Steel or copper alloy plain flange 28Figure 4 – Steel boss flange 29Figure 5 – Integrally forged or cast steel flange for valves only 30Figure 6 – Steel welding neck flange (see Table D to Table T) 31Figure 7 – Integrally cast iron flanges (see Table F and Table H) 32
List of tablesTable 1 – Flange materials – minimum requirements 3Table 2 – Temperature/pressure ratings for carbon steel flanges [see Annex B] 5Table A – Dimensions of plain, boss, integrally cast or forged flanges (for ratings see Table 2 and Annex B) 7Table D – Dimensions of plain, boss, integrally cast or forged and welding neck flanges (for ratings see Table 2 and Annex B) 9Table E – Dimensions of plain, boss, integrally cast or forged, and welding neck flanges (for ratings see Table 2 and Annex B) 12Table F – Dimensions of plain, boss, integrally cast or forged, and welding neck flanges (for ratings see Table 2 and Annex B) 14Table H – Dimensions of plain, boss, integrally cast or forged, and welding neck flanges (for ratings see Table 2 and Annex B) 16Table J – Dimensions of plain, boss, integrally cast or forged, and welding neck flanges (for ratings see Table 2 and Annex B) 18Table K – Dimensions of plain, integrally cast or forged, and welding neck flanges (for ratings see Table 2 and Annex B) 19Table R – Dimensions of plain, integrally cast or forged, and welding neck flanges (for ratings see Table 2 and Annex B) 21Table S – Dimensions of plain, integrally cast or forged, and welding neck flanges (for ratings see Table 2 and Annex B) 22Table T – Dimensions of plain, integrally cast or forged, and welding neck flanges (for ratings see Table 2 and Annex B) 24Table B.1 – Grey cast iron properties 34Table B.2 – Temperature/pressure ratings for grey cast iron and malleable cast iron flanges [see Clauses 5g) and 5h)] 35
BS 10:2009
ii • © BSI 2009
BRITISH STANDARD
Table B.3 – Temperature/pressure ratings for copper alloy flanges sizes 1⁄2 in to 3 in (inclusive) [see Clause 5j)] 35Table B.4 – Temperature/pressure ratings for copper alloy flanges sizes over 3 in [see Clause 5f)] 36Table C.1 – Application of bolts and stud-bolts [see Figure 2a) and Figure 2b)] 37Table C.2 – Materials, dimensions and finish of bolts, stud-bolts and nuts 39
Summary of pagesThis document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 42, an inside back cover and a back cover.
BRITISH STANDARD
© BSI 2009 • iii
BS 10:2009
Foreword
Publishing information
This British Standard is published by BSI and came into effect on 30 April 2009. It was prepared by Technical Committee PSE/15, Flanges. A list of organizations represented on this committee can be obtained on request to its secretary.
Supersession
This British Standard supersedes BS 10:1962, which is withdrawn.
Information about this document
It should be noted that, apart from cast iron flanges, the hydraulic test pressure applied to a flange joint is limited to one-and-a-half times the highest rated pressure of the flange (see Clause 8).
This is a full revision of the standard, and introduces the following principal changes:
• Materials have been updated;
• The standard has been re-arranged to reflect the most common used materials and types in service;
• Review of tables:
BS 10 flanges have been in use since 1904 and have been developed continuously to meet increasing pressure and temperature requirements. At the time of this revision, flange joints with carbon steel pipe flanges for high temperatures and pressures to the British Standard tables have been in service throughout the world for periods equal to the economic life of primary plant. The tables have therefore remained in the standard for guidance.
NOTE When it is required to convert the figures in this standard from imperial units into metric units it is recommended that the conversion factors and the table of conversion contained in BS 350, “Conversion factors and tables”, be used. Attention is also drawn to BS 2856, “Precise conversion of inch and metric sizes on engineering drawings”. (Use 1 in = 25 mm when converting to metric dimensions.)
Presentational conventions
The provisions of this standard are presented in roman (i.e. upright) type. Its requirements are expressed in sentences in which the principal auxiliary verb is “shall”.
Commentary, explanation and general informative material is presented in smaller italic type, and does not constitute a normative element.
Contractual and legal considerations
This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.
Compliance with a British Standard cannot confer immunity from legal obligations.
BS 10:2009
iv • © BSI 2009
BRITISH STANDARD
This page deliberately left blank
BRITISH STANDARD
© BSI 2009 • 1
BS 10:2009
1 ScopeThis British Standard specifies requirements for a series of carbon steel, alloy steel, cast iron and copper alloy flanges, and also appropriate bolts and nuts, for use with pipes, valves and fittings containing steam, oil, compressed air or water.
NOTE 1 The use of flanges complying with this standard for temperatures below −17.8 °C (0 °F) should be agreed between purchaser and manufacturer. These flanges may also be used on pipes, valves and fittings carrying other fluids for which the same requirements for safety and joint tightness are appropriate.
The applicability relationship between temperature and pressure for the above materials is specified for each table of flanges in Table 2 and Annex B.
NOTE 2 The types of gasket, and gasket materials, and the surface finish of the jointing face are matters for agreement between the purchaser and the manufacturer. When a raised jointing face is specified the outside diameter of the gasket should extend at least to the outside diameter of the raised face. For steel flanges when a raised jointing face is not specified, the gasket should be within the bolt holes.
2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
BS 21, Specification for pipe threads for tubes and fittings where pressure-tight joints are made on the threads (metric dimensions)
BS 84, Parallel screw threads of Whitworth form – Requirements
BS 916, Specification for black bolts screws and nuts – Hexagon & square, with B.S.W. threads, and partly machined bolts, screws & nuts, hexagon & square with B.S.W. or B.S.F. threads
BS 1580-1, Unified screw threads – Part 1: Screw threads with diameters 1⁄4 in and larger – Requirements
BS 1769, Specification for unified black hexagon bolts, screws and nuts – (UNC and UNF threads) – heavy series
BS 3410, Specification for metal washers for general engineering purposes
BS EN 10090, Wrought steels in the form of bars, billets, and forgings, up to 6 in ruling section, for automobile and general engineering purposes – En series
BS EN 10025-2, Hot rolled products of structural steels – Part 2: Technical delivery conditions for non-alloy structural steels
BS EN 10222-2, Steel forgings for pressure purposes – Part 2: Ferritic and martensitic steels with specified elevated temperature properties
BS EN 13480 Parts 1-5, Metallic industrial piping
BS EN 14324, Brazing – Guidance on the application of brazed joints
BS EN 10204, Metallic products —˜– Types of inspection documents
BS 10:2009
2 • © BSI 2009
BRITISH STANDARD
3 Design temperature and pressure3.1 The design temperature and pressure shall be stated by the purchaser. The tables provided in this standard are for guidance only and are based on historical data contained in previous revisions of this standard. If verification is required, this shall be the responsibility of the purchaser. One method of verification that could be used is BS EN 1591-1.
3.2 Where there is an appropriate application standard the purchaser shall ensure that the design temperature and pressure stated conform to the requirements of that standard.
NOTE The temperature-pressure ratings given in Table 2 and Annex B are design temperatures and pressures.
3.3 The pressure ratings, with the exception of those in the second column in Table B.2, shall be applied to installations subject to moderate shock such as might occur in an efficiently designed and operated boiler feed main.
3.4 Where a system might be subject to more severe shock, the purchaser shall make a suitable allowance when stating the design pressure or the flange table.
4 DesignationFlange sizes shall be designated by the nominal bores of their respective pipes as given in the first and last column of each table.
5 Flange dimensions
5.1 GeneralFlange dimensions shall conform to those specified in the appropriate tables and Figure 3 to Figure 7.
NOTE The thicknesses and diameters of flanges specified are minima.
5.2 Raised jointing faces for steel flanges only (see Figure 3 to Figure 6)NOTE 1 Raised jointing faces specified in Table H, Table J and Table K are recommended only for steel flanges.
If a raised jointing face is required on a steel flange specified in Table A, Table D, Table E and Table F, the diameter shall be 1⁄4 in less than the diameter of the inscribed circle touching the bolt holes.
NOTE 2 Raised jointing faces are not specified in Table H, Table J and Table K because it is not customary to use them on these flanges.
Raised jointing faces as specified in Table R, Table S and Table T shall be used.
5.3 Flange thicknesses (see Figure 3 to Figure 7)NOTE 1 The thickness (T) specified in the tables includes a raised jointing face having a height not exceeding 1⁄16 in. Where there is no raised face, T is the thickness of the flange. If the height of the raised jointing face is more than 1⁄16 in, the thickness (T) is increased by an equivalent amount.
The backs of integrally cast steel flanges shall be machined.
BRITISH STANDARD
© BSI 2009 • 3
BS 10:2009
NOTE 2 This machining may be either by spot-facing at the bolt holes or by back-facing at the option of the manufacturer (see Figure 5). The backs of other flanges may be left unmachined at the option of the manufacturer unless otherwise specified by the purchaser.
After machining, the thickness of the flange shall be not less than the thickness specified.
5.4 Flange drillingUnless otherwise specified by the purchaser all bolt holes shall be drilled, shall be equally spaced on the bolt pitch circle diameter, and in the case of integral flanges the bolt holes shall be drilled off centres.
For 1⁄2 inch and 5⁄8 inch bolts, the diameters of the holes shall be 1⁄16 inch larger than the diameters of the bolts, except that for cast iron flanges with 5⁄8 inch bolts the holes can be 1⁄8 inch larger than the diameters of the bolts. For 3⁄4 inch bolts and larger, the diameter of the holes shall be not greater than 1⁄8 inch larger than the diameters of the bolts in all cases.
6 Flange materials6.1 Steel flanges either forged, stamped or plate shall be manufactured from materials conforming to the minimum requirements as set out in Table 1.
NOTE Alternative materials can be used providing that the mechanical properties at operating temperature are not inferior to those given in the specifications set out in Table 1.
Table 1 Flange materials – minimum requirements
Flange table Temperature range −17.8 °C to 427 °C inc. (0 °F to 800 °F inc.)
A to J inclusive BS EN 10025-2, S235JR
K to T inclusive BS EN 10025-2, S275JR BS EN 10222-2, P245GH
NOTE For the minimum requirements of steel that can be used for flanges in Table A to Table H inclusive for temperatures from −17.8 °C (0 °F) to 260 °C (500 °F), see Annex B.
6.2 Flanges shall be free from laminations and surface defects.
6.3 Where welding neck flanges are made from wrought steel the direction of the fibres of the material in the neck shall be parallel to the longitudinal axis of the flange.
6.4 If the purchaser requires certificates of the process, chemical analysis of the specified elements and physical properties of the materials, this shall be stated on the order.
6.5 When the purchaser requires the individual flange he has ordered to be marked to identify the materials used, the system of marking to be employed shall be the subject of agreement between the purchaser and the manufacturer.
BS 10:2009
4 • © BSI 2009
BRITISH STANDARD
7 Attachment of flanges7.1 The method of securing flanges (other than integral flanges) to pipes and fittings supplied complete by manufacturers shall be in accordance with the appropriate application standard. Where there is no appropriate application standard, the methods of attachment shall be the subject of agreement between the purchaser and the manufacturer.
NOTE Where there is no appropriate application standard, the methods shown in BS EN 13480, Parts 1 to 5 and BS EN 12449 should be regarded as minimum requirements.
7.2 If flanges are to be supplied loose, they shall, unless otherwise specifically called for by the purchaser, be prepared for attachment to pipes as follows.
a) Steel flanges.
1) Boss flanges, sizes 6 in and smaller, screwed in accordance with BS 21.
2) Boss flanges, sizes 7 in to 12 in machined in the bore to slip over the outside diameter of the pipe or fitting; suitable for welding.
3) Plain flanges 1⁄2 in thick and thicker, machined in the bore; suitable for welding-on to form one of the types in the appropriate application standard as required by the purchaser. The purchaser shall specify the type of preparation required.
4) Welding neck flanges, machined in the bore to a diameter to be specified by the purchaser, and suitably bevelled for welding to pipes or fittings.
b) Copper alloy flanges. Machined in the bore to slip over the outside diameter of the pipe or fitting; suitable for fusion welding (where applicable).
8 Hydraulic testing of flange joints8.1 This standard does not specify the hydraulic test pressures for flanged pipes or components, details of which shall be obtained from the appropriate standards which specify test pressures for pipes or components but in any case, the test pressure to be applied to the joint shall not exceed one-and-a-half times the highest rated pressures for steel and copper alloy flanges, and twice the highest rated pressures for cast iron flanges.
8.2 Where flanged assemblies are not covered by any standard specifying test pressures but incorporate flanges conforming to this standard, or where any assembly is to be used for duties of a special nature, the test pressure shall be agreed between the purchaser and the manufacturer.
9 CertificationThe flange manufacturer shall use respective procedures to ensure material traceability and to avoid material exchange and shall be able to provide retrospective certification for the base material used. Certificates shall be provided in accordance with BS 10204, ENType 2.1 as a minimum but the purchaser may also request a 2.2 or 3.1 certificate at their option.
BRITISH STANDARD
© BSI 2009 • 5
BS 10:2009
Tab
le 2
Te
mp
erat
ure
/pre
ssu
re r
atin
gs
for
carb
on
ste
el fl
ang
es [
see
An
nex
B]
Tab
leTe
mp
erat
ure
°C
Max
imu
m
hyd
rau
lic
test
p
ress
ure
(l
bf/
in2 )
−17
.8 t
o
121.
1−
17.8
to
23
2.2
260.
028
7.8
315.
634
3.3
371.
139
942
7
Tem
per
atu
re °
F
0 to
250
0 to
450
500
550
600
650
700
750
800
Pres
sure
(lb
f/in
2 )
A50
A)
25 B
)—
——
——
——
75
D—
100
9585
8070
6555
5015
0
E—
200
185
170
155
140
130
115
100
300
F—
300
280
255
235
215
195
170
150
450
H—
500
465
430
395
355
320
285
250
750
J—
700
650
600
550
500
450
400
350
1 05
0
K—
900
835
770
705
645
580
515
450
1 35
0
R—
1 20
01
115
1 03
094
585
577
068
560
01
800
S—
1 80
01
670
1 54
51
415
1 28
51
155
1 03
090
02
700
T—
2 80
02
600
2 40
02
200
2 00
01
800
1 60
01
400
4 20
0
NO
TE
Inte
rmed
iate
val
ues
ab
ove
450
°F (
232.
2°C
) m
ay b
e o
bta
ined
by
linea
r in
terp
ola
tio
n.
A)
It is
cu
sto
mar
y in
th
e g
as in
du
stry
to
lim
it t
he
use
of
Tab
le A
flan
ges
to
wo
rkin
g g
as p
ress
ure
s n
ot
exce
edin
g 3
0 lb
f/in
2 . It
is r
eco
mm
end
ed t
hat
th
is li
mit
atio
n b
e al
so
app
lied
to
co
mp
ress
ed a
ir.B
) Th
is r
atin
g a
pp
lies
to t
emp
erat
ure
s ab
ove
121
.1 °
C (
250
°F)
up
to
an
d in
clu
din
g 2
32.2
°C
(45
0 °F
) an
d d
oes
no
t ap
ply
to
flan
ge
size
s ab
ove
36
in.
BS 10:2009
6 • © BSI 2009
BRITISH STANDARD
10 Low temperature flanges and boltingCOMMENTARY ON CLAUSE 10Alternative materials may be used provided that the mechanical properties at operating temperature are not inferior to those given in the specifications referred to below.
Flanges and bolting for low temperature duty shall conform to the following minimum requirements.
a) Steel flanges either plate, stamped, forged or cast and bolting material intended for use with pipes in accordance with BS 3603. Pressure ratings for these shall be stated by the purchaser.
b) Where copper alloy flanges to this standard are used for temperatures down to −200 °C (−328 °F), pressure ratings for these flanges shall be stated by the purchaser. Guidance is provided in Table B.3 or Table B.4, temperature range −17.8 °C to 121.1 °C (0 °F to 250 °F), and is based on historical data contained in previous revisions of this standard.
NOTE 9% aluminium bronze to BS 2032 is a suitable bolting material for the above low temperature range, but other copper alloys may be used by agreement between the purchaser and the supplier.
BRITISH STANDARD
© BSI 2009 • 7
BS 10:2009
Tab
le A
D
imen
sio
ns
of
pla
in, b
oss
, in
teg
rally
cas
t o
r fo
rged
flan
ges
(fo
r ra
tin
gs
see
Tab
le 2
an
d A
nn
ex B
)
Flan
ge
size
d
esig
nat
ion
(n
om
inal
b
ore
of
pip
e)
Ap
pro
xim
ate
ou
tsid
e d
iam
eter
of
stee
l pip
e A
)
Dia
met
er
of
flan
ge
Bo
lt c
ircl
e d
iam
eter
No
. of
bo
lts
Dia
met
er
of
bo
lts
B)
Dim
ensi
on
s o
f b
oss
(Fi
g 4
) C
)Th
ickn
ess
of
flan
ge
Bo
ss
len
gth
Dia
met
er
at s
mal
l en
d o
f b
oss
Max
imu
m
dia
met
er
at r
oo
t o
f b
oss
Gre
y ca
st ir
on
in
teg
rally
ca
st o
r sc
rew
ed o
n
wit
h b
oss
Mal
leab
le
cast
iro
n
scre
wed
on
w
ith
bo
ss
Co
pp
er a
lloy
cast
or
wro
ug
ht
inte
gra
l or
bo
ss
or
pla
in (
Fig
. 3)
Wro
ug
ht
stee
l in
teg
ral o
r p
lain
(F
ig. 3
) o
r b
oss
(F
ig. 4
)
HL
PN
OA
BE
T 1T 2
T 3T 4
inin
inin
inin
inin
inin
inin
27 ⁄3
23
3 ⁄42
5 ⁄84
1 ⁄2 3⁄8
1 5 ⁄1
61
1 ⁄2 1⁄2
3 ⁄16
1⁄4
3⁄16
D)
3⁄4
1 1 ⁄1
64
2 7 ⁄8
41 ⁄2
7⁄16
1 1 ⁄2
1 3 ⁄4
1⁄2
3 ⁄16
1⁄4
3⁄16
D)
11
11⁄32
4 1 ⁄2
3 1 ⁄4
41 ⁄2
7⁄16
1 7 ⁄8
2 1 ⁄1
6 1⁄2
3 ⁄16
5⁄16
3⁄16
D)
1 1 ⁄4
1 11
⁄164
3 ⁄43
7 ⁄16
41 ⁄2
7⁄16
2 3 ⁄1
62
9 ⁄32
5⁄8
1 ⁄4 5⁄16
1⁄4
D)
1 1 ⁄2
1 29
⁄325
1 ⁄43
7 ⁄84
1 ⁄2 1⁄2
2 7 ⁄1
62
3 ⁄4 5⁄8
1 ⁄4 3⁄8
1⁄4
D)
22
3 ⁄86
4 1 ⁄2
45 ⁄8
1⁄2
2 15
⁄163
1 ⁄8 5⁄8
5 ⁄16
3⁄8
5⁄16
D)
2 1 ⁄2
36
1 ⁄25
45 ⁄8
5⁄8
3 9 ⁄1
63
21⁄32
11 ⁄1
65 ⁄1
6 7⁄16
5⁄16
D)
33
1 ⁄27
1 ⁄45
3 ⁄44
5 ⁄8 5⁄8
4 3 ⁄1
64
13⁄32
11 ⁄1
63 ⁄8
1⁄2
3⁄8
D)
3 1 ⁄2
48
6 1 ⁄2
45 ⁄8
11 ⁄1
64
11⁄16
5 1 ⁄8
3⁄4
3 ⁄8 9⁄16
3⁄8
D)
44
1 ⁄28
1 ⁄27
45 ⁄8
3⁄4
5 1 ⁄4
5 1 ⁄2
3⁄4
3 ⁄8 5⁄8
3⁄8
D)
55
1 ⁄210
8 1 ⁄4
45 ⁄8
3⁄4
6 5 ⁄1
66
3 ⁄4 3⁄4
1 ⁄2 1
1 ⁄16
1⁄2
66
1 ⁄211
9 1 ⁄4
45 ⁄8
3⁄4
7 5 ⁄1
67
3 ⁄4 1
3 ⁄16
1 ⁄2 1
1 ⁄16
1⁄2
6 5 ⁄8
77
5 ⁄812
10 1 ⁄4
85 ⁄8
7⁄8
8 3 ⁄8
8 3 ⁄4
13 ⁄1
6—
3⁄4
1⁄2
88
5 ⁄813
1 ⁄411
1 ⁄28
5 ⁄8 7⁄8
9 1 ⁄2
10 7⁄8
— 3⁄4
1⁄2
99
5 ⁄814
1 ⁄212
3 ⁄48
5 ⁄81
10 1 ⁄2
11 1 ⁄8
7⁄8
— 3⁄4
5⁄8
1010
3 ⁄416
148
3 ⁄41
1 ⁄16
11 3 ⁄4
12 3 ⁄1
6 1
5 ⁄16
— 3⁄4
5⁄8
1212
3 ⁄418
168
3 ⁄41
1 ⁄813
3 ⁄414
3 ⁄16
15 ⁄1
6—
7⁄8
3⁄4
1314
19 1 ⁄4
17 1 ⁄4
83 ⁄4
——
— 1
5 ⁄16
— 7⁄8
3⁄4
1415
20 3 ⁄4
18 1 ⁄2
87 ⁄8
——
—1
—1
7⁄8
1516
21 3 ⁄4
19 1 ⁄2
87 ⁄8
——
—1
—1
7⁄8
16—
22 3 ⁄4
20 1 ⁄2
127 ⁄8
——
—1
1 ⁄16
—1
7⁄8
1718
2421
3 ⁄412
7 ⁄8—
——
1 1 ⁄1
6—
1 1 ⁄1
6 7⁄8
18—
25 1 ⁄4
2312
7 ⁄8—
——
1 1 ⁄1
6—
1 1 ⁄1
6 7⁄8
1920
26 1 ⁄2
2412
7 ⁄8—
——
1 1 ⁄8
—1
1 ⁄8 7⁄8
20—
27 3 ⁄4
25 1 ⁄4
127 ⁄8
——
—1
1 ⁄8—
1 1 ⁄8
1
2122
2926
1 ⁄212
7 ⁄8—
——
1 1 ⁄8
—1
1 ⁄81
BS 10:2009
8 • © BSI 2009
BRITISH STANDARD BRITISH STANDARD
© BSI 2009 • 9
BS 10:2009Ta
ble
A
Dim
ensi
on
s o
f p
lain
, bo
ss, i
nte
gra
lly c
ast
or
forg
ed fl
ang
es (
for
rati
ng
s se
e Ta
ble
2 a
nd
An
nex
B)
(co
nti
nu
ed)
Flan
ge
size
d
esig
nat
ion
(n
om
inal
b
ore
of
pip
e)
Ap
pro
xim
ate
ou
tsid
e d
iam
eter
of
stee
l pip
e A
)
Dia
met
er
of
flan
ge
Bo
lt c
ircl
e d
iam
eter
No
. of
bo
lts
Dia
met
er
of
bo
lts
B)
Dim
ensi
on
s o
f b
oss
(Fi
g 4
) C
)Th
ickn
ess
of
flan
ge
Bo
ss
len
gth
Dia
met
er
at s
mal
l en
d o
f b
oss
Max
imu
m
dia
met
er
at r
oo
t o
f b
oss
Gre
y ca
st ir
on
in
teg
rally
ca
st o
r sc
rew
ed o
n
wit
h b
oss
Mal
leab
le
cast
iro
n
scre
wed
on
w
ith
bo
ss
Co
pp
er a
lloy
cast
or
wro
ug
ht
inte
gra
l or
bo
ss
or
pla
in (
Fig
. 3)
Wro
ug
ht
stee
l in
teg
ral o
r p
lain
(F
ig. 3
) o
r b
oss
(F
ig. 4
)
HL
PN
OA
BE
T 1T 2
T 3T 4
inin
inin
inin
inin
inin
inin
22—
3027
1 ⁄212
1—
——
1 3 ⁄1
6—
1 3 ⁄1
61
2324
3128
1 ⁄212
1—
——
1 3 ⁄1
6—
1 3 ⁄1
61
24—
32 1 ⁄2
29 3 ⁄4
121
——
—1
3 ⁄16
—1
3 ⁄16
1
2626
33 1 ⁄4
30 3 ⁄4
161
——
—1
1 ⁄4—
—1
2728
34 1 ⁄4
31 3 ⁄4
161
——
—1
1 ⁄4—
—1
2930
36 1 ⁄4
33 3 ⁄4
201
——
—1
1 ⁄4—
—1
30—
37 1 ⁄4
34 3 ⁄4
201
——
—1
1 ⁄4—
—1
3334
40 1 ⁄2
3820
1—
——
1 1 ⁄4
——
1 1 ⁄8
3536
42 1 ⁄2
4024
1—
——
1 1 ⁄4
——
1 1 ⁄8
36—
43 1 ⁄2
4124
1—
——
1 3 ⁄8
——
1 1 ⁄8
3940
46 1 ⁄2
4424
1—
——
1 3 ⁄8
——
1 1 ⁄8
4243
49 1 ⁄2
4728
1—
——
1 3 ⁄8
——
1 1 ⁄4
45—
52 3 ⁄4
50 1 ⁄4
281
——
—1
1 ⁄2—
—1
1 ⁄4
4849
55 3 ⁄4
53 1 ⁄4
281
——
—1
1 ⁄2—
—1
1 ⁄4
5455
63 1 ⁄4
60 1 ⁄4
321
1 ⁄4—
——
1 3 ⁄4
——
1 3 ⁄8
6061
70 1 ⁄4
6732
1 1 ⁄4
——
—1
7 ⁄8—
—1
1 ⁄2
6667
1 ⁄476
1 ⁄273
1 ⁄432
1 1 ⁄4
——
—2
1 ⁄8—
—1
5 ⁄8
7273
1 ⁄483
79 1 ⁄2
361
3 ⁄8—
——
2 3 ⁄8
——
1 3 ⁄4
A)
(H)
For
avai
lab
ility
of
stee
l pip
e si
zes,
ref
er t
o B
S EN
102
16, B
S EN
102
17. S
ee B
S 46
22 a
nd
BS
4722
fo
r o
uts
ide
dia
met
ers
of
cast
iro
n p
ipes
. See
BS
EN 1
2449
fo
r th
e si
zes
of
cop
per
pip
es f
or
use
wit
h c
op
per
allo
y fl
ang
es u
p t
o 8
in b
ore
.B
) (O
) Fo
r 1 ⁄2
in a
nd
5 ⁄8 in
bo
lts,
th
e d
iam
eter
s o
f th
e h
ole
s sh
all b
e 1 ⁄1
6 in
larg
er t
han
th
e b
olt
s an
d f
or
3 ⁄4 in
bo
lts
and
siz
es a
bo
ve, t
he
dia
met
ers
shal
l be
no
t m
ore
th
an 1 ⁄8
in la
rger
th
an t
he
bo
lts.
Fo
r ca
st ir
on
flan
ges
th
e d
iam
eter
s o
f th
e b
olt
ho
les
may
be
1 ⁄8 in
larg
er t
han
th
e b
olt
s o
f si
zes
5 ⁄8 in
an
d a
bo
ve.
For
7 ⁄8 in
bo
lts
and
siz
es a
bo
ve, t
he
dia
met
ers
shal
l be
no
t m
ore
th
an 1 ⁄8
in la
rger
th
an t
he
bo
lts.
C)
(A, B
an
d E
) Ta
per
s ar
e n
ot
spec
ified
bu
t sh
all b
e su
ch t
hat
th
e m
axim
um
dia
met
ers
at r
oo
t o
f b
oss
are
no
t ex
ceed
ed.
D)
(T4)
It is
imp
ract
icab
le t
o u
se t
hic
knes
s le
ss t
han
1 ⁄2 in
exc
ept
for
bo
ss a
nd
inte
gra
l flan
ges
.
BS 10:2009
8 • © BSI 2009
BRITISH STANDARD BRITISH STANDARD
© BSI 2009 • 9
BS 10:2009
Tab
le D
D
imen
sio
ns
of
pla
in, b
oss
, in
teg
rally
cas
t o
r fo
rged
an
d w
eld
ing
nec
k fl
ang
es (
for
rati
ng
s se
e Ta
ble
2 a
nd
An
nex
B)
Flan
ge
size
des
-ig
nat
ion
(n
om
inal
b
ore
of
pip
e)
Ap
pro
x-im
ate
ou
tsid
e d
iam
-et
er o
f st
eel
pip
e A
)
Dia
m-
eter
of
flan
ge
Bo
lt
circ
le
dia
m-
eter
No
. o
f b
olt
s
Dia
m-
eter
of
bo
lts
B)
Dim
ensi
on
s o
f b
oss
(F
ig 4
) C
)D
imen
sio
ns
of
nec
ks f
or
cast
ir
on
(Fi
g. 7
)
Dim
ensi
on
s o
f st
eel w
eld
ing
n
ecks
(Fi
g. 6
)Th
ickn
ess
of
flan
ge
Bo
ss
len
gth
Dia
m-
eter
at
smal
l en
d
of
bo
ss
Max
i-m
um
d
iam
-et
er a
t ro
ot
of
bo
ss
Dia
m-
eter
at
larg
e en
d
of
nec
k
Len
gth
o
f ta
per
Dia
m-
eter
at
larg
e en
d
of
nec
k
Dia
m-
eter
at
smal
l en
d o
f n
eck
D)
Tota
l le
ng
th
of
nec
k
Len
gth
o
f ta
per
Gre
y ca
st ir
on
in
te-
gra
lly
cast
or
scre
wed
o
n w
ith
b
oss
Co
pp
er
allo
y ca
st o
r w
rou
gh
t in
teg
ral
or
bo
ss
or
pla
in
(Fig
. 3)
Wro
ug
ht
stee
l in
teg
ral
or
pla
in
(Fig
. 3)
or
bo
ss
(Fig
. 4)
or
wel
din
g
nec
k (F
ig. 6
) (e
xcep
t fo
r va
lves
)
Cas
t st
eel
inte
gra
l o
r p
lain
(F
ig. 3
) o
r b
oss
(Fi
g. 4
) o
r w
eld
ing
n
eck
(Fig
. 6)
(exc
ept
for
valv
es)
Forg
ed
or
cast
st
eel
inte
gra
l (F
ig. 5
) (f
or
va
lves
o
nly
)
HD
PN
OA
BE
CG
JK
LM
T 1T 3
T 5T 6
T 9in
inin
inin
inin
inin
inin
inin
inin
inin
inin
in1 ⁄2
27⁄32
3 3 ⁄4
2 5 ⁄8
41 ⁄2
3 ⁄81
5 ⁄16
1 1 ⁄2
——
1 1 ⁄1
67 ⁄8
7⁄8
5⁄8
1⁄2
1⁄4
3 ⁄16
E) 3⁄8
E) 3⁄8
3 ⁄41
1 ⁄16
42
7 ⁄84
1 ⁄27 ⁄1
61
1 ⁄21
3 ⁄4—
—1
5 ⁄16
1 3 ⁄3
2 7⁄8
5⁄8
1⁄2
1⁄4
3 ⁄16
E) 3⁄8
E) 3⁄8
11
11⁄32
4 1 ⁄2
3 1 ⁄4
41 ⁄2
7 ⁄16
1 7 ⁄8
2 1 ⁄1
6—
—1
11⁄16
1 3 ⁄8
7⁄8
5⁄8
1⁄2
5⁄16
3 ⁄16
E) 3⁄8
E) 3⁄8
1 1 ⁄4
1 11
⁄164
3 ⁄43
7 ⁄16
41 ⁄2
7 ⁄16
2 3 ⁄1
62
9 ⁄32
——
1 15
⁄161
23⁄32
1 5⁄8
5⁄8
5⁄16
1 ⁄4 E)
1⁄2
1⁄2
1 1 ⁄2
1 29
⁄325
1 ⁄43
7 ⁄84
1 ⁄21 ⁄2
2 7 ⁄1
62
3 ⁄4—
—2
5 ⁄16
1 15
⁄161
1 ⁄8 3⁄4
5⁄8
3⁄8
1 ⁄4 E)
1⁄2
1⁄2
22
3 ⁄86
4 1 ⁄2
45 ⁄8
1 ⁄22
15⁄16
3 1 ⁄8
——
2 3 ⁄4
2 13
⁄321
1 ⁄8 3⁄4
11 ⁄1
6 3⁄8
5 ⁄16
E) 9⁄16
9⁄16
2 1 ⁄2
36
1 ⁄25
45 ⁄8
5 ⁄83
9 ⁄16
3 21
⁄32—
—3
1 ⁄43
1 ⁄32
1 1 ⁄4
7⁄8
11 ⁄1
6 7⁄16
5 ⁄16
E) 9⁄16
9⁄16
33
1 ⁄27
1 ⁄45
3 ⁄44
5 ⁄85 ⁄8
4 3 ⁄1
64
13⁄32
——
43
17⁄32
1 3 ⁄8
1 3⁄4
1⁄2
3 ⁄8 E)
9⁄16
9⁄16
3 1 ⁄2
48
6 1 ⁄2
45 ⁄8
11⁄16
4 11
⁄165
1 ⁄8—
—4
1 ⁄24
1 ⁄16
1 3 ⁄8
1 3⁄4
9⁄16
3 ⁄8 E)
9⁄16
9⁄16
44
1 ⁄28
1 ⁄27
45 ⁄8
3 ⁄45
1 ⁄45
1 ⁄2—
—5
1 ⁄84
9 ⁄16
1 5 ⁄8
1 1 ⁄4
3⁄4
5⁄8
3 ⁄8 E)
11 ⁄1
6 1
1 ⁄16
55
1 ⁄210
8 1 ⁄4
85 ⁄8
3 ⁄46
5 ⁄16
6 3 ⁄4
——
65
9 ⁄16
1 3 ⁄4
1 1 ⁄4
13 ⁄1
6 1
1 ⁄16
1 ⁄2 1
1 ⁄16
11 ⁄1
6
66
1 ⁄211
9 1 ⁄4
85 ⁄8
3 ⁄47
5 ⁄16
7 3 ⁄4
——
7 1 ⁄4
6 9 ⁄1
61
7 ⁄81
1 ⁄4 1
3 ⁄16
11 ⁄1
61 ⁄2
11 ⁄1
6 1
1 ⁄16
6 5 ⁄8
6 23
⁄32
77
5 ⁄812
10 1 ⁄4
85 ⁄8
7 ⁄88
3 ⁄48
3 ⁄4—
—8
1 ⁄47
23⁄32
21
3 ⁄8 7⁄8
3⁄4
1 ⁄2 3⁄4
3⁄4
88
5 ⁄813
1 ⁄411
1 ⁄28
5 ⁄87 ⁄8
9 1 ⁄2
10—
—9
1 ⁄28
23⁄32
21
3 ⁄8 7⁄8
3⁄4
1 ⁄2 3⁄4
3⁄4
99
5 ⁄814
1 ⁄212
3 ⁄48
5 ⁄81
10 1 ⁄2
11 1 ⁄8
——
10 5 ⁄8
9 3 ⁄4
2 1 ⁄4
1 1 ⁄2
7⁄8
3⁄4
5 ⁄8 3⁄4
3⁄4
1010
3 ⁄416
148
3 ⁄41
1 ⁄16
11 3 ⁄4
12 3 ⁄1
6—
—11
1 ⁄210
7 ⁄82
1 ⁄21
3 ⁄41
3⁄4
5 ⁄8 3⁄4
3⁄4
1212
3 ⁄418
1612
3 ⁄41
1 ⁄813
3 ⁄414
3 ⁄16
——
13 1 ⁄2
12 29
⁄322
3 ⁄42
1 7⁄8
3 ⁄4 7⁄8
7⁄8
1314
19 1 ⁄4
17 1 ⁄4
123 ⁄4
——
——
—15
14 5 ⁄3
22
7 ⁄82
1 ⁄81
7⁄8
3 ⁄4 7⁄8
7⁄8
1415
F)20
3 ⁄418
1 ⁄212
7 ⁄8—
——
——
1615
5 ⁄32
2 7 ⁄8
2 1 ⁄8
1 1 ⁄8
17 ⁄8
11
1516
21 3 ⁄4
19 1 ⁄2
127 ⁄8
——
——
—17
16 3 ⁄1
63
2 1 ⁄4
1 1 ⁄8
17 ⁄8
11
BS 10:2009
10 • © BSI 2009
BRITISH STANDARD BRITISH STANDARD
© BSI 2009 • 11
BS 10:2009Ta
ble
D
Dim
ensi
on
s o
f p
lain
, bo
ss, i
nte
gra
lly c
ast
or
forg
ed a
nd
wel
din
g n
eck
flan
ges
(fo
r ra
tin
gs
see
Tab
le 2
an
d A
nn
ex B
) (c
on
tin
ued
)
Flan
ge
size
des
-ig
nat
ion
(n
om
inal
b
ore
of
pip
e)
Ap
pro
x-im
ate
ou
tsid
e d
iam
-et
er o
f st
eel
pip
e A
)
Dia
m-
eter
of
flan
ge
Bo
lt
circ
le
dia
m-
eter
No
. o
f b
olt
s
Dia
m-
eter
of
bo
lts
B)
Dim
ensi
on
s o
f b
oss
(F
ig 4
) C
)D
imen
sio
ns
of
nec
ks f
or
cast
ir
on
(Fi
g. 7
)
Dim
ensi
on
s o
f st
eel w
eld
ing
n
ecks
(Fi
g. 6
)Th
ickn
ess
of
flan
ge
Bo
ss
len
gth
Dia
m-
eter
at
smal
l en
d
of
bo
ss
Max
i-m
um
d
iam
-et
er a
t ro
ot
of
bo
ss
Dia
m-
eter
at
larg
e en
d
of
nec
k
Len
gth
o
f ta
per
Dia
m-
eter
at
larg
e en
d
of
nec
k
Dia
m-
eter
at
smal
l en
d o
f n
eck
D)
Tota
l le
ng
th
of
nec
k
Len
gth
o
f ta
per
Gre
y ca
st ir
on
in
te-
gra
lly
cast
or
scre
wed
o
n w
ith
b
oss
Co
pp
er
allo
y ca
st o
r w
rou
gh
t in
teg
ral
or
bo
ss
or
pla
in
(Fig
. 3)
Wro
ug
ht
stee
l in
teg
ral
or
pla
in
(Fig
. 3)
or
bo
ss
(Fig
. 4)
or
wel
din
g
nec
k (F
ig. 6
) (e
xcep
t fo
r va
lves
)
Cas
t st
eel
inte
gra
l o
r p
lain
(F
ig. 3
) o
r b
oss
(Fi
g. 4
) o
r w
eld
ing
n
eck
(Fig
. 6)
(exc
ept
for
valv
es)
Forg
ed
or
cast
st
eel
inte
gra
l (F
ig. 5
) (f
or
va
lves
o
nly
)
HD
PN
OA
BE
CG
JK
LM
T 1T 3
T 5T 6
T 9in
inin
inin
inin
inin
inin
inin
inin
inin
inin
in
16—
22 3 ⁄4
20 1 ⁄2
12 7⁄8
——
——
——
——
—1
1 ⁄81
7⁄8
11
1718
2421
3 ⁄412
7⁄8
——
——
——
——
—1
1 ⁄81
1 ⁄81
1 1 ⁄8
1 1 ⁄8
18—
25 1 ⁄4
2312
7⁄8
——
——
——
——
—1
1 ⁄41
1 ⁄81
1 1 ⁄8
1 1 ⁄8
1920
26 1 ⁄2
2412
7⁄8
——
——
——
——
—1
1 ⁄41
1 ⁄81
1 1 ⁄8
1 1 ⁄8
20—
27 3 ⁄4
25 1 ⁄4
16 7⁄8
——
——
——
——
—1
1 ⁄41
1 ⁄41
1 ⁄81
1 ⁄41
1 ⁄4
2122
2926
1 ⁄216
7⁄8
——
——
——
——
—1
3 ⁄81
1 ⁄41
1 ⁄81
1 ⁄41
1 ⁄4
22—
3027
1 ⁄216
1—
——
——
——
——
1 3 ⁄8
1 1 ⁄4
1 1 ⁄8
1 1 ⁄4
1 1 ⁄4
2324
3128
1 ⁄216
1—
——
——
——
——
1 3 ⁄8
1 3 ⁄8
1 1 ⁄8
1 3 ⁄8
1 3 ⁄8
24—
32 1 ⁄2
29 3 ⁄4
161
——
——
——
——
—1
3 ⁄81
3 ⁄81
1 ⁄41
3 ⁄81
3 ⁄8
2728
35 3 ⁄4
33 1 ⁄4
201
——
——
——
——
—1
1 ⁄2—
1 3 ⁄8
1 1 ⁄2
1 1 ⁄2
2930
38 1 ⁄4
35 1 ⁄2
201
1 ⁄8—
——
——
——
——
1 1 ⁄2
—1
5 ⁄81
5 ⁄81
1 ⁄2
30—
39 1 ⁄4
36 1 ⁄2
201
1 ⁄8—
——
——
——
——
1 5 ⁄8
—1
5 ⁄81
5 ⁄81
5 ⁄8
3334
4340
201
1 ⁄4—
——
——
——
——
1 5 ⁄8
—1
3 ⁄41
3 ⁄41
5 ⁄8
3536
4542
241
1 ⁄4—
——
——
——
——
1 3 ⁄4
—1
7 ⁄81
7 ⁄81
3 ⁄4
36—
46 1 ⁄4
4324
1 1 ⁄4
——
——
——
——
—1
3 ⁄4—
1 7 ⁄8
1 7 ⁄8
1 3 ⁄4
3940
49 1 ⁄2
46 1 ⁄4
241
1 ⁄4—
——
——
——
——
1 3 ⁄4
—2
21
3 ⁄4
4243
52 1 ⁄2
49 1 ⁄4
281
1 ⁄4—
——
——
——
——
1 7 ⁄8
—2
1 ⁄82
1 ⁄81
7 ⁄8
45—
55 3 ⁄4
52 1 ⁄2
281
1 ⁄4—
——
——
——
——
2—
2 1 ⁄4
2 1 ⁄4
2
4849
58 3 ⁄4
55 1 ⁄2
321
1 ⁄4—
——
——
——
——
2—
2 3 ⁄8
2 3 ⁄8
2
5455
63 1 ⁄4
60 1 ⁄4
361
1 ⁄4—
——
——
——
——
2 1 ⁄4
—2
3 ⁄82
3 ⁄82
1 ⁄4
6061
70 1 ⁄4
6740
1 3 ⁄8
——
——
——
——
—2
3 ⁄8—
2 1 ⁄2
2 1 ⁄2
2 3 ⁄8
BS 10:2009
10 • © BSI 2009
BRITISH STANDARD BRITISH STANDARD
© BSI 2009 • 11
BS 10:2009
Tab
le D
D
imen
sio
ns
of
pla
in, b
oss
, in
teg
rally
cas
t o
r fo
rged
an
d w
eld
ing
nec
k fl
ang
es (
for
rati
ng
s se
e Ta
ble
2 a
nd
An
nex
B)
(co
nti
nu
ed)
Flan
ge
size
des
-ig
nat
ion
(n
om
inal
b
ore
of
pip
e)
Ap
pro
x-im
ate
ou
tsid
e d
iam
-et
er o
f st
eel
pip
e A
)
Dia
m-
eter
of
flan
ge
Bo
lt
circ
le
dia
m-
eter
No
. o
f b
olt
s
Dia
m-
eter
of
bo
lts
B)
Dim
ensi
on
s o
f b
oss
(F
ig 4
) C
)D
imen
sio
ns
of
nec
ks f
or
cast
ir
on
(Fi
g. 7
)
Dim
ensi
on
s o
f st
eel w
eld
ing
n
ecks
(Fi
g. 6
)Th
ickn
ess
of
flan
ge
Bo
ss
len
gth
Dia
m-
eter
at
smal
l en
d
of
bo
ss
Max
i-m
um
d
iam
-et
er a
t ro
ot
of
bo
ss
Dia
m-
eter
at
larg
e en
d
of
nec
k
Len
gth
o
f ta
per
Dia
m-
eter
at
larg
e en
d
of
nec
k
Dia
m-
eter
at
smal
l en
d o
f n
eck
D)
Tota
l le
ng
th
of
nec
k
Len
gth
o
f ta
per
Gre
y ca
st ir
on
in
te-
gra
lly
cast
or
scre
wed
o
n w
ith
b
oss
Co
pp
er
allo
y ca
st o
r w
rou
gh
t in
teg
ral
or
bo
ss
or
pla
in
(Fig
. 3)
Wro
ug
ht
stee
l in
teg
ral
or
pla
in
(Fig
. 3)
or
bo
ss
(Fig
. 4)
or
wel
din
g
nec
k (F
ig. 6
) (e
xcep
t fo
r va
lves
)
Cas
t st
eel
inte
gra
l o
r p
lain
(F
ig. 3
) o
r b
oss
(Fi
g. 4
) o
r w
eld
ing
n
eck
(Fig
. 6)
(exc
ept
for
valv
es)
Forg
ed
or
cast
st
eel
inte
gra
l (F
ig. 5
) (f
or
va
lves
o
nly
)
HD
PN
OA
BE
CG
JK
LM
T 1T 3
T 5T 6
T 9in
inin
inin
inin
inin
inin
inin
inin
inin
inin
in
6667
1 ⁄476
1 ⁄273
1 ⁄440
1 3 ⁄8
——
——
——
——
—2
1 ⁄2—
2 5 ⁄8
2 5 ⁄8
2 1 ⁄2
7273
1 ⁄483
79 1 ⁄2
441
1 ⁄2—
——
——
——
——
2 5 ⁄8
—2
7 ⁄82
7 ⁄82
5 ⁄8
78—
89 1 ⁄2
8644
1 1 ⁄2
——
—82
2 7 ⁄8
——
——
2 3 ⁄4
—3
——
84—
96 3 ⁄4
92 3 ⁄4
441
3 ⁄4—
——
88 1 ⁄4
2 7 ⁄8
——
——
2 7 ⁄8
—3
1 ⁄4—
—
96—
109
1 ⁄410
5 1 ⁄4
521
3 ⁄4—
——
100
3 ⁄43
1 ⁄2—
——
—3
1 ⁄4—
3 5 ⁄8
——
108
—12
1 3 ⁄4
117
3 ⁄456
1 3 ⁄4
——
—11
3 1 ⁄4
4 1 ⁄4
——
——
3 1 ⁄2
—4
——
120
—13
513
0 1 ⁄2
602
——
—12
5 1 ⁄2
4 1 ⁄4
——
——
3 3 ⁄4
—4
1 ⁄2—
—A
) (H
) Fo
r av
aila
bili
ty o
f st
eel p
ipe
size
s, r
efer
to
BS
EN 1
0216
, BS
EN 1
0217
. See
BS
4622
an
d B
S 47
22 f
or
ou
tsid
e d
iam
eter
s o
f ca
st ir
on
pip
es. S
ee B
S EN
124
49 f
or
the
size
s o
f co
pp
er p
ipes
fo
r u
se w
ith
co
pp
er a
lloy
flan
ges
up
to
8 in
bo
re.
B)
(O)
For
1 ⁄2 in
an
d 5 ⁄8
in b
olt
s, t
he
dia
met
ers
of
the
ho
les
shal
l be
1 ⁄16
in la
rger
th
an t
he
bo
lts
and
fo
r 3 ⁄4
in b
olt
s an
d s
izes
ab
ove
, th
e d
iam
eter
s sh
all b
e n
ot
mo
re t
han
1 ⁄8 in
larg
er t
han
th
e b
olt
s. F
or
cast
iro
n fl
ang
es t
he
dia
met
ers
of
the
bo
lt h
ole
s m
ay b
e 1 ⁄8
in la
rger
th
an t
he
bo
lts
of
size
s 5 ⁄8
in a
nd
ab
ove
.Fo
r 7 ⁄8
in b
olt
s an
d s
izes
ab
ove
, th
e d
iam
eter
s sh
all b
e n
ot
mo
re t
han
1 ⁄8 in
larg
er t
han
th
e b
olt
s.C
) (A
. B &
E)
Tap
ers
are
no
t sp
ecifi
ed b
ut
shal
l be
such
th
at t
he
max
imu
m d
iam
eter
s at
ro
ot
of
bo
ss a
re n
ot
exce
eded
.D
) (K
) Th
e d
iam
eter
s ta
bu
late
d a
pp
ly t
o p
ipes
wit
h o
uts
ide
dia
met
ers
in a
cco
rdan
ce w
ith
H. F
or
pip
es d
esig
nat
ed b
y th
eir
bo
res,
dim
ensi
on
K s
hal
l be
such
th
at t
he
dif
fere
nce
bet
wee
n t
he
corr
esp
on
din
g d
iam
eter
s K
an
d H
is m
ain
tain
ed.
E)
(T5
and
T6)
It is
imp
ract
icab
le t
o u
se t
hic
knes
s le
ss t
han
1 ⁄2 in
exc
ept
for
bo
ss a
nd
inte
gra
l flan
ges
.F)
(H
) It
is r
eco
mm
end
ed t
hat
th
is s
ize
for
stee
l pip
es s
ho
uld
be
avo
ided
wh
erev
er p
oss
ible
.
BS 10:2009
12 • © BSI 2009
BRITISH STANDARD BRITISH STANDARD
© BSI 2009 • 13
BS 10:2009Ta
ble
E
Dim
ensi
on
s o
f p
lain
, bo
ss, i
nte
gra
lly c
ast
or
forg
ed, a
nd
wel
din
g n
eck
flan
ges
(fo
r ra
tin
gs
see
Tab
le 2
an
d A
nn
ex B
)
Flan
ge
size
des
-ig
nat
ion
(n
om
inal
b
ore
of
pip
e)
Ap
pro
xi-
mat
e o
uts
ide
dia
met
er
of
stee
l p
ipe
A)
Dia
m-
eter
of
flan
ge
Bo
lt
circ
le
dia
m-
eter
No
. of
bo
lts
Dia
m-
eter
of
bo
lts
B)
Dim
ensi
on
s o
f b
oss
(F
ig.4
) C
)D
imen
sio
ns
of
stee
l wel
din
g n
ecks
(F
ig. 6
)Th
ickn
ess
of
flan
ge
Bo
ss
len
gth
Dia
m-
eter
at
smal
l en
d o
f b
oss
Max
i-m
um
d
iam
-et
er a
t ro
ot
of
bo
ss
Dia
m-
eter
at
larg
e en
d o
f n
eck
D)
Dia
m-
eter
at
smal
l en
d o
f n
eck
Tota
l le
ng
th
of
nec
k
Len
gth
o
f ta
per
Gre
y ca
st ir
on
in
teg
rally
ca
st o
r sc
rew
ed
on
wit
h
bo
ss
Co
pp
er
allo
y ca
st o
r w
rou
gh
t in
teg
ral
or
bo
ss
or
pla
in
(Fig
. 3)
Wro
ug
ht
stee
l in
te-
gra
l or
pla
in
(Fig
. 3)
or
bo
ss (
Fig
. 4)
or
wel
din
g
nec
k (F
ig. 6
) (e
xcep
t fo
r va
lves
)
Cas
t st
eel
inte
gra
l o
r p
lain
(F
ig. 3
) o
r b
oss
(Fi
g. 4
) o
r w
eld
ing
n
eck
(Fig
. 6)
(exc
ept
for
valv
es)
Forg
ed o
r ca
st s
teel
in
teg
ral
(Fig
. 5)
(fo
r va
lves
o
nly
)
HD
PN
OA
BE
JK
LM
T 1T 3
T 5T 6
T 9in
inin
inin
inin
inin
inin
inin
inin
inin
1⁄2
27 ⁄3
23
3 ⁄42
5 ⁄84
1 ⁄2 3⁄8
1 5 ⁄1
61
1 ⁄21
1 ⁄16
7 ⁄8 7⁄8
5⁄8
1⁄2
1⁄4
1⁄4
E) 3⁄8
E) 3⁄8
3⁄4
1 1 ⁄1
64
2 7 ⁄8
41 ⁄2
7⁄16
1 1 ⁄2
1 3 ⁄4
1 5 ⁄1
61
3 ⁄32
7⁄8
5⁄8
1⁄2
1⁄4
1⁄4
E) 3⁄8
E) 3⁄8
11
11⁄32
4 1 ⁄2
3 1 ⁄4
41 ⁄2
7⁄16
1 7 ⁄8
2 1 ⁄1
61
11⁄16
1 3 ⁄8
7⁄8
5⁄8
1⁄2
5⁄16
9⁄32
E) 3⁄8
E) 3⁄8
1 1 ⁄4
1 11
⁄164
3 ⁄43
7 ⁄16
41 ⁄2
7⁄16
2 3 ⁄1
62
9 ⁄32
1 15
⁄161
23⁄32
1 5⁄8
5⁄8
5⁄16
5⁄16
E) 1⁄2
1⁄2
1 1 ⁄2
1 29
⁄325
1 ⁄43
7 ⁄84
1 ⁄2 1⁄2
2 7 ⁄1
62
3 ⁄42
5 ⁄16
1 15
⁄161
1 ⁄8 3⁄4
5⁄8
3⁄8
11 ⁄3
2 E)
1⁄2
1⁄2
22
3 ⁄86
4 1 ⁄2
45 ⁄8
1⁄2
2 15
⁄163
1 ⁄82
3 ⁄42
13⁄32
1 1 ⁄8
3⁄4
3⁄4
3⁄8
3⁄8
E) 9⁄16
9⁄16
2 1 ⁄2
36
1 ⁄25
45 ⁄8
5⁄8
3 9 ⁄1
63
21⁄32
3 1 ⁄4
3 1 ⁄3
21
1 ⁄4 7⁄8
3⁄4
7⁄16
13 ⁄3
2 E)
9⁄16
9⁄16
33
1 ⁄27
1 ⁄45
3 ⁄44
5 ⁄8 5⁄8
4 3 ⁄1
64
13⁄32
43
17⁄32
1 3 ⁄8
1 3⁄4
1⁄2
7⁄16
E) 9⁄16
9⁄16
3 1 ⁄2
48
6 1 ⁄2
85 ⁄8
11 ⁄1
64
11⁄16
5 1 ⁄8
4 1 ⁄2
4 1 ⁄1
61
3 ⁄81
3⁄4
9⁄16
15 ⁄3
2 E)
9⁄16
9⁄16
44
1 ⁄28
1 ⁄27
1 ⁄48
5 ⁄8 3⁄4
5 1 ⁄4
5 1 ⁄2
5 1 ⁄8
4 9 ⁄1
61
5 ⁄81
1 ⁄4 7⁄8
5⁄8
1⁄2
11 ⁄1
6 1
1 ⁄16
55
1 ⁄210
8 1 ⁄4
85 ⁄8
3⁄4
6 5 ⁄1
66
3 ⁄46
5 9 ⁄1
61
3 ⁄41
1 ⁄4 7⁄8
11 ⁄1
6 9⁄16
11 ⁄1
6 1
1 ⁄16
66
1 ⁄211
9 1 ⁄4
83 ⁄4
3⁄4
7 5 ⁄1
67
1 ⁄27
1 ⁄46
9 ⁄16
1 7 ⁄8
1 1 ⁄4
7⁄8
11 ⁄1
6 1
1 ⁄16
11 ⁄1
6 1
1 ⁄16
6 5 ⁄8
6 23
⁄32
77
5 ⁄812
10 1 ⁄4
83 ⁄4
7⁄8
8 3 ⁄8
8 1 ⁄2
8 1 ⁄4
7 23
⁄322
1 3 ⁄8
1 3⁄4
3⁄4
3⁄4
3⁄4
88
5 ⁄813
1 ⁄411
1 ⁄28
3 ⁄4 7⁄8
9 1 ⁄2
9 13
⁄169
1 ⁄28
23⁄32
21
3 ⁄81
3⁄4
3⁄4
3⁄4
3⁄4
99
5 ⁄814
1 ⁄212
3 ⁄412
3 ⁄41
10 1 ⁄2
10 15
⁄1610
5 ⁄89
3 ⁄42
1 ⁄41
1 ⁄21
13 ⁄1
6 1
3 ⁄16
13 ⁄1
6 1
3 ⁄16
1010
3 ⁄416
1412
3 ⁄41
1 ⁄16
11 3 ⁄4
12 3 ⁄1
611
1 ⁄210
7 ⁄82
1 ⁄21
3 ⁄41
7⁄8
7⁄8
7⁄8
7⁄8
1212
3 ⁄418
1612
7 ⁄81
1 ⁄813
3 ⁄413
15⁄16
13 1 ⁄2
12 29
⁄322
3 ⁄42
1 1 ⁄8
11
11
1314
19 1 ⁄4
17 1 ⁄4
127 ⁄8
——
—15
14 5 ⁄3
22
7 ⁄82
1 ⁄81
1 ⁄81
11
1
1415
F)20
3 ⁄418
1 ⁄212
7 ⁄8—
——
1615
5 ⁄32
2 7 ⁄8
2 1 ⁄8
1 1 ⁄4
11
1 ⁄81
1 ⁄81
1516
21 3 ⁄4
19 1 ⁄2
127 ⁄8
——
—17
16 3 ⁄1
63
2 1 ⁄4
1 1 ⁄4
11
1 ⁄41
1 ⁄41
16—
22 3 ⁄4
20 1 ⁄2
127 ⁄8
——
——
——
—1
1 ⁄41
1 1 ⁄4
1 1 ⁄4
1
1718
2421
3 ⁄412
7 ⁄8—
——
——
——
1 3 ⁄8
1 1 ⁄8
1 3 ⁄8
1 3 ⁄8
1 1 ⁄8
18—
25 1 ⁄4
2316
7 ⁄8—
——
——
——
1 3 ⁄8
1 1 ⁄8
1 3 ⁄8
1 3 ⁄8
1 1 ⁄8
BS 10:2009
12 • © BSI 2009
BRITISH STANDARD BRITISH STANDARD
© BSI 2009 • 13
BS 10:2009
Tab
le E
D
imen
sio
ns
of
pla
in, b
oss
, in
teg
rally
cas
t o
r fo
rged
, an
d w
eld
ing
nec
k fl
ang
es (
for
rati
ng
s se
e Ta
ble
2 a
nd
An
nex
B)
(co
nti
nu
ed)
Flan
ge
size
des
-ig
nat
ion
(n
om
inal
b
ore
of
pip
e)
Ap
pro
xi-
mat
e o
uts
ide
dia
met
er
of
stee
l p
ipe
A)
Dia
m-
eter
of
flan
ge
Bo
lt
circ
le
dia
m-
eter
No
. of
bo
lts
Dia
m-
eter
of
bo
lts
B)
Dim
ensi
on
s o
f b
oss
(F
ig.4
) C
)D
imen
sio
ns
of
stee
l wel
din
g n
ecks
(F
ig. 6
)Th
ickn
ess
of
flan
ge
Bo
ss
len
gth
Dia
m-
eter
at
smal
l en
d o
f b
oss
Max
i-m
um
d
iam
-et
er a
t ro
ot
of
bo
ss
Dia
m-
eter
at
larg
e en
d o
f n
eck
D)
Dia
m-
eter
at
smal
l en
d o
f n
eck
Tota
l le
ng
th
of
nec
k
Len
gth
o
f ta
per
Gre
y ca
st ir
on
in
teg
rally
ca
st o
r sc
rew
ed
on
wit
h
bo
ss
Co
pp
er
allo
y ca
st o
r w
rou
gh
t in
teg
ral
or
bo
ss
or
pla
in
(Fig
. 3)
Wro
ug
ht
stee
l in
te-
gra
l or
pla
in
(Fig
. 3)
or
bo
ss (
Fig
. 4)
or
wel
din
g
nec
k (F
ig. 6
) (e
xcep
t fo
r va
lves
)
Cas
t st
eel
inte
gra
l o
r p
lain
(F
ig. 3
) o
r b
oss
(Fi
g. 4
) o
r w
eld
ing
n
eck
(Fig
. 6)
(exc
ept
for
valv
es)
Forg
ed o
r ca
st s
teel
in
teg
ral
(Fig
. 5)
(fo
r va
lves
o
nly
)
HD
PN
OA
BE
JK
LM
T 1T 3
T 5T 6
T 9in
inin
inin
inin
inin
inin
inin
inin
inin
1920
26 1 ⁄2
2416
7⁄8
——
——
——
—1
3 ⁄81
1 ⁄41
1 ⁄21
1 ⁄21
1 ⁄4
20—
27 3 ⁄4
25 1 ⁄4
16 7⁄8
——
——
——
—1
1 ⁄21
1 ⁄41
1 ⁄21
1 ⁄21
1 ⁄4
2122
2926
1 ⁄216
1—
——
——
——
1 1 ⁄2
1 3 ⁄8
1 5 ⁄8
1 5 ⁄8
1 3 ⁄8
22—
3027
1 ⁄216
1—
——
——
——
1 1 ⁄2
1 3 ⁄8
1 3 ⁄4
1 3 ⁄4
1 3 ⁄8
2324
3128
1 ⁄216
1—
——
——
——
1 5 ⁄8
1 3 ⁄8
1 3 ⁄4
1 3 ⁄4
1 3 ⁄8
24—
32 1 ⁄2
29 3 ⁄4
161
1 ⁄8—
——
——
——
1 5 ⁄8
1 1 ⁄2
1 7 ⁄8
1 7 ⁄8
1 1 ⁄2
2728
35 3 ⁄4
33 1 ⁄4
201
1 ⁄8—
——
——
——
1 3 ⁄4
—2
21
3 ⁄4
2930
38 1 ⁄4
35 1 ⁄2
201
1 ⁄4—
——
——
——
1 7 ⁄8
—2
1 ⁄82
1 ⁄81
7 ⁄8
30—
39 1 ⁄4
36 1 ⁄2
201
1 ⁄4—
——
——
——
1 7 ⁄8
—2
1 ⁄82
1 ⁄81
7 ⁄8
3334
4340
201
1 ⁄4—
——
——
——
2—
2 1 ⁄4
2 1 ⁄4
2
3536
4542
241
1 ⁄4—
——
——
——
2—
2 1 ⁄2
2 1 ⁄2
2
36—
46 1 ⁄4
4324
1 1 ⁄4
——
——
——
—2
—2
1 ⁄22
1 ⁄22
3940
49 1 ⁄2
46 1 ⁄4
241
3 ⁄8—
——
——
——
2 1 ⁄8
—2
5 ⁄82
5 ⁄82
1 ⁄8
4243
52 1 ⁄2
49 1 ⁄4
281
3 ⁄8—
——
——
——
2 1 ⁄4
—2
3 ⁄42
3 ⁄42
1 ⁄4
45—
55 3 ⁄4
52 1 ⁄2
281
3 ⁄8—
——
——
——
2 3 ⁄8
—3
32
3 ⁄8
4849
58 3 ⁄4
55 1 ⁄2
321
3 ⁄8—
——
——
——
2 3 ⁄8
—3
1 ⁄83
1 ⁄82
3 ⁄8A
) (H
) Fo
r av
aila
bili
ty o
f st
eel p
ipe
size
s, r
efer
to
BS
EN 1
0216
, BS
EN 1
0217
. See
BS
4622
an
d B
S 47
22 f
or
ou
tsid
e d
iam
eter
s o
f ca
st ir
on
pip
es. S
ee B
S EN
124
49 f
or
the
size
s o
f co
pp
er p
ipes
fo
r u
se w
ith
co
pp
er a
lloy
flan
ges
up
to
8 in
bo
re.
B)
(O)
For
1 ⁄2 in
an
d 5 ⁄8
in b
olt
s, t
he
dia
met
ers
of
the
ho
les
shal
l be
1 ⁄16
in la
rger
th
an t
he
bo
lts
and
fo
r 3 ⁄4
in b
olt
s an
d s
izes
ab
ove
, th
e d
iam
eter
s sh
all b
e n
ot
mo
re t
han
1 ⁄8 in
larg
er t
han
th
e b
olt
s.
For
cast
iro
n fl
ang
es t
he
dia
met
ers
of
the
bo
lt h
ole
s m
ay b
e 1 ⁄8
in la
rger
th
an t
he
bo
lts
of
size
s 5 ⁄8
in a
nd
ab
ove
.Fo
r 7 ⁄8
in b
olt
s an
d s
izes
ab
ove
, th
e d
iam
eter
s sh
all b
e n
ot
mo
re t
han
1 ⁄8 in
larg
er t
han
th
e b
olt
s.C
) (A
. B &
E)
Tap
ers
are
no
t sp
ecifi
ed b
ut
shal
l be
such
th
at t
he
max
imu
m d
iam
eter
s at
ro
ot
of
bo
ss a
re n
ot
exce
eded
.D
) (K
) Th
e d
iam
eter
s ta
bu
late
d a
pp
ly t
o p
ipes
wit
h o
uts
ide
dia
met
ers
in a
cco
rdan
ce w
ith
H. F
or
pip
es d
esig
nat
ed b
y th
eir
bo
res,
dim
ensi
on
K s
hal
l be
such
th
at t
he
dif
fere
nce
bet
wee
n t
he
corr
esp
on
din
g d
iam
eter
s K
an
d H
is m
ain
tain
ed.
E)
(T5
and
T6)
It is
imp
ract
icab
le t
o u
se t
hic
knes
s le
ss t
han
1 ⁄2 in
exc
ept
for
bo
ss a
nd
inte
gra
l flan
ges
.F)
(H
) It
is r
eco
mm
end
ed t
hat
th
is s
ize
for
stee
l pip
es s
ho
uld
be
avo
ided
wh
erev
er p
oss
ible
.
BS 10:2009
14 • © BSI 2009
BRITISH STANDARD BRITISH STANDARD
© BSI 2009 • 15
BS 10:2009Ta
ble
F
Dim
ensi
on
s o
f p
lain
, bo
ss, i
nte
gra
lly c
ast
or
forg
ed, a
nd
wel
din
g n
eck
flan
ges
(fo
r ra
tin
gs
see
Tab
le 2
an
d A
nn
ex B
)
Flan
ge
size
des
-ig
nat
ion
(n
om
inal
b
ore
of
pip
e)
Ap
pro
xi-
mat
e o
uts
ide
dia
met
er
of
stee
l p
ipe
A)
Dia
m-
eter
of
flan
ge
Bo
lt
circ
le
dia
m-
eter
No
. o
f b
olt
s
Dia
m-
eter
of
bo
lts
B)
Dim
ensi
on
s o
f b
oss
(F
ig. 4
) C
)D
imen
sio
ns
of
nec
ks f
or
cast
ir
on
(Fi
g. 7
)
Dim
ensi
on
s o
f st
eel w
eld
ing
nec
ks
(Fig
. 6)
Thic
knes
s o
f fl
ang
e
Bo
ss
len
gth
Dia
m-
eter
at
smal
l en
d o
f b
oss
Max
i-m
um
d
iam
-et
er a
t ro
ot
of
bo
ss
Dia
m-
eter
at
larg
e en
d o
f n
eck
Len
gth
o
f ta
per
Dia
m-
eter
at
larg
e en
d o
f n
eck
Dia
m-
eter
at
smal
l en
d o
f n
eck
D)
Tota
l le
ng
th
of
nec
k
Len
gth
o
f ta
per
Gre
y ca
st ir
on
in
teg
rally
ca
st o
r sc
rew
ed
on
wit
h
bo
ss
Co
pp
er
allo
y ca
st o
r w
rou
gh
t in
teg
ral
or
bo
ss
or
pla
in
(Fig
. 3)
Cas
t o
r w
rou
gh
t st
eel i
nte
-g
ral o
r p
lain
(F
ig. 3
) o
r b
oss
(Fi
g. 4
) o
r w
eld
ing
n
eck
(Fig
. 6)
(exc
ept
for
valv
es)
Forg
ed
or
cast
st
eel
inte
gra
l (F
ig. 5
) (f
or
valv
es
on
ly)
HD
PN
OA
BE
CG
JK
LM
T 1T 3
T 7T 9
inin
inin
inin
inin
inin
inin
inin
inin
inin
1⁄2
27 ⁄3
23
3 ⁄42
5 ⁄84
1⁄2
3⁄8
1 5 ⁄1
61
1 ⁄21
1⁄2
1 1 ⁄1
6 7⁄8
7⁄8
5⁄8
1⁄2
5⁄16
3⁄8
E) 3⁄8
3⁄4
1 1 ⁄1
64
2 7 ⁄8
4 1⁄2
7⁄16
1 1 ⁄2
1 3 ⁄4
1 1 ⁄4
1⁄2
1 5 ⁄1
61
3 ⁄32
7⁄8
5⁄8
1⁄2
5⁄16
3⁄8
E) 3⁄8
11
11⁄32
4 3 ⁄4
3 7 ⁄1
64
5⁄8
7⁄16
1 7 ⁄8
2 1 ⁄1
61
5 ⁄8 1⁄2
1 11
⁄161
3 ⁄81
1 ⁄8 5⁄8
1⁄2
3⁄8
3⁄8
E) 3⁄8
1 1 ⁄4
1 11
⁄165
1 ⁄43
7 ⁄84
5⁄8
7⁄16
2 3 ⁄1
62
1 ⁄22
5⁄8
2 1 ⁄1
61
23⁄32
1 3 ⁄8
3⁄4
5⁄8
3⁄8
1⁄2
1⁄2
1 1 ⁄2
1 29
⁄325
1 ⁄24
1 ⁄84
5⁄8
1⁄2
2 7 ⁄1
62
3 ⁄42
1 ⁄4 5⁄8
2 5 ⁄1
61
15⁄16
1 3 ⁄8
3⁄4
5⁄8
7⁄16
1⁄2
1⁄2
22
3 ⁄86
1 ⁄25
4 5⁄8
1⁄2
2 15
⁄163
21⁄32
3 3⁄4
2 3 ⁄4
2 13
⁄321
3 ⁄8 3⁄4
3⁄4
7⁄16
5⁄8
5⁄8
2 1 ⁄2
37
1 ⁄45
3 ⁄48
5⁄8
5⁄8
3 9 ⁄1
64
13⁄32
3 5 ⁄8
3⁄4
3 3 ⁄8
3 1 ⁄3
21
1 ⁄2 3⁄4
3⁄4
1⁄2
5⁄8
5⁄8
33
1 ⁄28
6 1 ⁄2
8 5⁄8
5⁄8
4 3 ⁄1
65
1 ⁄84
1 ⁄8 3⁄4
43
17⁄32
1 3 ⁄4
1 3⁄4
9⁄16
5⁄8
5⁄8
3 1 ⁄2
48
1 ⁄27
8 5⁄8
11 ⁄1
64
11⁄16
5 21
⁄324
3 ⁄4 7⁄8
4 1 ⁄2
4 1 ⁄1
61
3 ⁄41
7⁄8
5⁄8
3⁄4
3⁄4
44
1 ⁄29
7 1 ⁄2
8 5⁄8
3⁄4
5 1 ⁄4
65
1 ⁄4 7⁄8
5 1 ⁄8
4 9 ⁄1
62
1 1 ⁄4
7⁄8
11 ⁄1
6 3⁄4
3⁄4
55
1 ⁄211
9 1 ⁄4
8 3⁄4
3⁄4
6 5 ⁄1
67
1 ⁄26
1 ⁄21
6 1 ⁄4
5 9 ⁄1
62
1 ⁄41
1 ⁄21
3⁄4
7⁄8
7⁄8
66
1 ⁄212
10 1 ⁄4
12 3⁄4
3⁄4
7 5 ⁄1
68
1 ⁄27
5 ⁄81
7 1 ⁄4
6 9 ⁄1
62
1 ⁄41
1 ⁄21
7⁄8
7⁄8
7⁄8
6 5 ⁄8
6 23
⁄32
77
5 ⁄813
1 ⁄411
1 ⁄212
3⁄4
7⁄8
8 3 ⁄8
9 13
⁄168
5 ⁄81
8 3 ⁄8
7 23
⁄322
1 ⁄41
1 ⁄21
7⁄8
7⁄8
7⁄8
88
5 ⁄814
1 ⁄212
3 ⁄412
3⁄4
7⁄8
9 1 ⁄2
119
5 ⁄81
1 ⁄89
1 ⁄28
23⁄32
2 5 ⁄8
1 3 ⁄4
1 1 ⁄8
11
1
99
5 ⁄816
1412
7⁄8
110
1 ⁄211
15⁄16
10 3 ⁄4
1 1 ⁄8
10 5 ⁄8
9 3 ⁄4
2 7 ⁄8
21
1 ⁄81
1 1 ⁄8
1
1010
3 ⁄417
1512
7⁄8
1 1 ⁄1
611
3 ⁄412
15⁄16
11 3 ⁄4
1 1 ⁄8
11 3 ⁄4
10 7 ⁄8
2 7 ⁄8
21
1 ⁄81
1 1 ⁄8
1
1212
3 ⁄419
1 ⁄417
1 ⁄416
7⁄8
1 1 ⁄8
13 3 ⁄4
15 3 ⁄1
614
1 1 ⁄4
13 7 ⁄8
12 29
⁄323
1 ⁄82
1 ⁄41
1 ⁄41
1 ⁄81
1 ⁄41
1 ⁄8
1314
20 3 ⁄4
13 1 ⁄2
161
——
—15
1 ⁄81
1 ⁄415
1 ⁄414
5 ⁄32
3 3 ⁄8
2 1 ⁄2
1 1 ⁄4
1 1 ⁄8
1 3 ⁄8
1 1 ⁄8
1415
F)21
3 ⁄419
1 ⁄216
1—
——
16 1 ⁄8
1 3 ⁄8
16 1 ⁄4
15 5 ⁄3
23
3 ⁄82
1 ⁄21
3 ⁄81
1 ⁄41
3 ⁄81
1 ⁄4
1516
22 3 ⁄4
20 1 ⁄2
161
——
—17
1 ⁄41
3 ⁄817
1 ⁄416
3 ⁄16
3 3 ⁄8
2 1 ⁄2
1 3 ⁄8
1 1 ⁄4
1 1 ⁄2
1 1 ⁄4
16—
2421
3 ⁄420
1—
——
18 1 ⁄4
1 3 ⁄8
——
——
1 3 ⁄8
1 1 ⁄4
1 5 ⁄8
1 1 ⁄4
1718
25 1 ⁄4
2320
1—
——
19 3 ⁄8
1 1 ⁄2
——
——
1 1 ⁄2
1 3 ⁄8
1 3 ⁄4
1 3 ⁄8
18—
26 1 ⁄2
2420
1 1 ⁄8
——
—20
1 ⁄21
1 ⁄2—
——
—1
1 ⁄21
3 ⁄81
3 ⁄41
3 ⁄8
BS 10:2009
14 • © BSI 2009
BRITISH STANDARD BRITISH STANDARD
© BSI 2009 • 15
BS 10:2009
Tab
le F
D
imen
sio
ns
of
pla
in, b
oss
, in
teg
rally
cas
t o
r fo
rged
, an
d w
eld
ing
nec
k fl
ang
es (
for
rati
ng
s se
e Ta
ble
2 a
nd
An
nex
B)
(co
nti
nu
ed)
Flan
ge
size
des
-ig
nat
ion
(n
om
inal
b
ore
of
pip
e)
Ap
pro
xi-
mat
e o
uts
ide
dia
met
er
of
stee
l p
ipe
A)
Dia
m-
eter
of
flan
ge
Bo
lt
circ
le
dia
m-
eter
No
. o
f b
olt
s
Dia
m-
eter
of
bo
lts
B)
Dim
ensi
on
s o
f b
oss
(F
ig. 4
) C
)D
imen
sio
ns
of
nec
ks f
or
cast
ir
on
(Fi
g. 7
)
Dim
ensi
on
s o
f st
eel w
eld
ing
nec
ks
(Fig
. 6)
Thic
knes
s o
f fl
ang
e
Bo
ss
len
gth
Dia
m-
eter
at
smal
l en
d o
f b
oss
Max
i-m
um
d
iam
-et
er a
t ro
ot
of
bo
ss
Dia
m-
eter
at
larg
e en
d o
f n
eck
Len
gth
o
f ta
per
Dia
m-
eter
at
larg
e en
d o
f n
eck
Dia
m-
eter
at
smal
l en
d o
f n
eck
D)
Tota
l le
ng
th
of
nec
k
Len
gth
o
f ta
per
Gre
y ca
st ir
on
in
teg
rally
ca
st o
r sc
rew
ed
on
wit
h
bo
ss
Co
pp
er
allo
y ca
st o
r w
rou
gh
t in
teg
ral
or
bo
ss
or
pla
in
(Fig
. 3)
Cas
t o
r w
rou
gh
t st
eel i
nte
-g
ral o
r p
lain
(F
ig. 3
) o
r b
oss
(Fi
g. 4
) o
r w
eld
ing
n
eck
(Fig
. 6)
(exc
ept
for
valv
es)
Forg
ed
or
cast
st
eel
inte
gra
l (F
ig. 5
) (f
or
valv
es
on
ly)
HD
PN
OA
BE
CG
JK
LM
T 1T 3
T 7T 9
inin
inin
inin
inin
inin
inin
inin
inin
inin
1920
27 3 ⁄4
25 1 ⁄4
201
1 ⁄8—
——
21 5 ⁄8
1 1 ⁄2
——
——
1 1 ⁄2
1 3 ⁄8
1 3 ⁄4
1 3 ⁄8
20—
2926
1 ⁄224
1 1 ⁄8
——
—22
3 ⁄41
5 ⁄8—
——
—1
5 ⁄81
1 ⁄22
1 1 ⁄2
2122
3027
1 ⁄224
1 1 ⁄8
——
—23
3 ⁄41
5 ⁄8—
——
—1
5 ⁄81
1 ⁄22
1 1 ⁄2
22—
3128
1 ⁄224
1 1 ⁄8
——
—24
3 ⁄41
5 ⁄8—
——
—1
5 ⁄81
1 ⁄22
1 ⁄81
1 ⁄2
2324
32 1 ⁄2
29 3 ⁄4
241
1 ⁄4—
——
25 7 ⁄8
1 3 ⁄4
——
——
1 3 ⁄4
1 5 ⁄8
2 1 ⁄4
1 5 ⁄8
24—
33 1 ⁄2
30 3 ⁄4
241
1 ⁄4—
——
271
3 ⁄4—
——
—1
3 ⁄41
5 ⁄82
1 ⁄41
5 ⁄8
2728
36 3 ⁄4
33 3 ⁄4
241
1 ⁄4—
——
30 1 ⁄4
1 7 ⁄8
——
——
1 7 ⁄8
—2
3 ⁄81
7 ⁄8
2930
3936
241
1 ⁄4—
——
32 1 ⁄2
2—
——
—2
—2
5 ⁄82
30—
4037
281
1 ⁄4—
——
33 1 ⁄2
2—
——
—2
—2
5 ⁄82
3334
4340
321
1 ⁄4—
——
36 1 ⁄2
2 1 ⁄8
——
——
2 1 ⁄8
—2
3 ⁄42
1 ⁄8
3536
45 3 ⁄4
42 1 ⁄2
321
3 ⁄8—
——
38 3 ⁄4
2 1 ⁄4
——
——
2 1 ⁄4
—3
2 1 ⁄4
36—
46 3 ⁄4
43 1 ⁄2
321
3 ⁄8—
——
39 3 ⁄4
2 1 ⁄4
——
——
2 1 ⁄4
—3
2 1 ⁄4
3940
50 1 ⁄4
4736
1 3 ⁄8
——
—43
2 3 ⁄8
——
——
2 3 ⁄8
—3
1 ⁄42
3 ⁄8
4243
53 1 ⁄4
5036
1 3 ⁄8
——
—46
2 1 ⁄2
——
——
2 1 ⁄2
—3
3 ⁄82
1 ⁄2
45—
5753
1 ⁄236
1 1 ⁄2
——
—49
1 ⁄42
5 ⁄8—
——
—2
5 ⁄8—
3 5 ⁄8
2 5 ⁄8
4849
60 1 ⁄4
56 3 ⁄4
401
1 ⁄2—
——
52 1 ⁄2
2 5 ⁄8
——
——
2 5 ⁄8
—3
3 ⁄42
5 ⁄8A
) (H
) Fo
r av
aila
bili
ty o
f st
eel p
ipe
size
s, r
efer
to
BS
EN 1
0216
, BS
EN 1
0217
. See
BS
4622
an
d B
S 47
22 f
or
ou
tsid
e d
iam
eter
s o
f ca
st ir
on
pip
es. S
ee B
S EN
124
49 f
or
the
size
s o
f co
pp
er p
ipes
fo
r u
se w
ith
co
pp
er a
lloy
flan
ges
up
to
8 in
bo
re.
B)
(O)
For
1 ⁄2 in
an
d 5 ⁄8
in b
olt
s, t
he
dia
met
ers
of
the
ho
les
shal
l be
1 ⁄16
in la
rger
th
an t
he
bo
lts
and
fo
r 3 ⁄4
in b
olt
s an
d s
izes
ab
ove
, th
e d
iam
eter
s sh
all b
e n
ot
mo
re t
han
1 ⁄8 in
larg
er t
han
th
e b
olt
s.
For
cast
iro
n fl
ang
es t
he
dia
met
ers
of
the
bo
lt h
ole
s m
ay b
e 1 ⁄8
in la
rger
th
an t
he
bo
lts
of
size
s 5 ⁄8
in a
nd
ab
ove
.C
) (A
. B &
E)
Tap
ers
are
no
t sp
ecifi
ed b
ut
shal
l be
such
th
at t
he
max
imu
m d
iam
eter
s at
ro
ot
of
bo
ss a
re n
ot
exce
eded
.D
) (K
) Th
e d
iam
eter
s ta
bu
late
d a
pp
ly t
o p
ipes
wit
h o
uts
ide
dia
met
ers
in a
cco
rdan
ce w
ith
H. F
or
pip
es d
esig
nat
ed b
y th
eir
bo
res,
dim
ensi
on
K s
hal
l be
such
th
at t
he
dif
fere
nce
bet
wee
n t
he
corr
esp
on
din
g d
iam
eter
s K
an
d H
is m
ain
tain
ed.
E)
(T7)
It is
imp
ract
icab
le t
o u
se t
hic
knes
s le
ss t
han
1 ⁄2 in
exc
ept
for
bo
ss fl
ang
es o
r in
teg
ral fl
ang
es.
F)
(H)
It is
rec
om
men
ded
th
at t
his
siz
e fo
r st
eel p
ipes
sh
ou
ld b
e av
oid
ed w
her
ever
po
ssib
le.
BS 10:2009
16 • © BSI 2009
BRITISH STANDARD BRITISH STANDARD
© BSI 2009 • 17
BS 10:2009Ta
ble
H
Dim
ensi
on
s o
f p
lain
, bo
ss, i
nte
gra
lly c
ast
or
forg
ed, a
nd
wel
din
g n
eck
flan
ges
(fo
r ra
tin
gs
see
Tab
le 2
an
d A
nn
ex B
)
Flan
ge
size
des
-ig
nat
ion
(n
om
inal
b
ore
of
pip
e)
Ap
pro
x-im
ate
ou
tsid
e d
iam
-et
er o
f st
eel
pip
e A
)
Dia
m-
eter
of
flan
ge
Bo
lt
circ
le
dia
m-
eter
No
. o
f b
olt
s
Dia
m-
eter
of
bo
lts
B)
Dim
ensi
on
s o
f b
oss
(F
ig. 4
) C
)D
imen
sio
ns
of
nec
ks f
or
cast
ir
on
(Fi
g. 7
)
Dim
ensi
on
s o
f st
eel w
eld
ing
n
ecks
(Fi
g. 6
)D
iam
eter
o
f ra
ised
fa
ce (
see
Cla
use
4)
(Fig
s 3,
4,
5, 6
)
Thic
knes
s o
f fl
ang
e
Bo
ss
len
gth
Dia
m-
eter
at
smal
l en
d
of
bo
ss
Max
i-m
um
d
iam
-et
er a
t ro
ot
of
bo
ss
Dia
m-
eter
at
larg
e en
d o
f n
eck
Len
gth
o
f ta
per
Dia
m-
eter
at
larg
e en
d
of
nec
k
Dia
m-
eter
at
smal
l en
d o
f n
eck
D)
Tota
l le
ng
th
of
nec
k
Len
gth
o
f ta
per
Gre
y ca
st ir
on
in
te-
gra
lly
cast
or
scre
wed
o
n w
ith
b
oss
Co
pp
er
allo
y ca
st o
r w
rou
gh
t in
teg
ral
or
bo
ss
or
pla
in
(Fig
. 3)
Cas
t o
r w
rou
gh
t st
eel i
nte
-g
ral o
r p
lain
(F
ig. 3
) o
r b
oss
(Fi
g. 4
) o
r w
eld
ing
n
eck
(Fig
. 6)
(exc
ept
for
valv
es)
Forg
ed
or
cast
st
eel
inte
-g
ral
(Fig
. 5)
(fo
r va
lves
o
nly
)
HD
PN
OA
BE
CG
JK
LM
FT 1
T 3T 7
T 9in
inin
inin
inin
inin
inin
inin
inin
inin
inin
1⁄2
27 ⁄3
24
1 ⁄23
1 ⁄44
5⁄8
3⁄8
1 5 ⁄1
61
7 ⁄81
1⁄2
1 3 ⁄1
6 7⁄8
1 1 ⁄8
5⁄8
2 1 ⁄4
5⁄8
3⁄8
1⁄2
1⁄2
3⁄4
1 1 ⁄1
64
1 ⁄23
1 ⁄44
5⁄8
7⁄16
1 1 ⁄2
1 7 ⁄8
1 3 ⁄8
1⁄2
1 3 ⁄8
1 3 ⁄3
21
1 ⁄8 5⁄8
2 1 ⁄4
5⁄8
3⁄8
1⁄2
1⁄2
11
11⁄32
4 3 ⁄4
3 7 ⁄1
64
5⁄8
7⁄16
1 7 ⁄8
2 1 ⁄1
61
3 ⁄4 1⁄2
1 11
⁄161
3 ⁄81
1 ⁄8 5⁄8
2 1 ⁄2
3⁄4
7⁄16
9⁄16
9⁄16
1 1 ⁄4
1 11
⁄165
1 ⁄43
7 ⁄84
5⁄8
7⁄16
2 3 ⁄1
62
1 ⁄22
1 ⁄8 5⁄8
2 1 ⁄1
61
23⁄32
1 3 ⁄8
3⁄4
3 7⁄8
7⁄16
11 ⁄1
6 1
1 ⁄16
1 1 ⁄2
1 29
⁄325
1 ⁄24
1 ⁄84
5⁄8
1⁄2
2 7 ⁄1
62
3 ⁄42
1 ⁄2 5⁄8
2 5 ⁄1
61
15⁄16
1 3 ⁄8
3⁄4
3 1 ⁄4
7⁄8
1⁄2
11 ⁄1
6 1
1 ⁄16
22
3 ⁄86
1 ⁄25
4 5⁄8
1⁄2
2 15
⁄163
21⁄32
3 1 ⁄8
3⁄4
2 3 ⁄4
2 13
⁄321
3 ⁄8 3⁄4
41
1⁄2
3⁄4
3⁄4
2 1 ⁄2
37
1 ⁄45
3 ⁄48
5⁄8
5⁄8
3 9 ⁄1
64
13⁄32
3 3 ⁄4
3⁄4
3 3 ⁄8
3 1 ⁄3
21
1 ⁄2 3⁄4
4 1 ⁄2
1 9⁄16
3⁄4
3⁄4
33
1 ⁄28
6 1 ⁄2
8 5⁄8
5⁄8
4 3 ⁄1
65
1 ⁄84
1 ⁄2 3⁄4
43
17⁄32
1 3 ⁄4
15
1 1 ⁄8
5⁄8
7⁄8
7⁄8
3 1 ⁄2
48
1 ⁄27
8 5⁄8
11 ⁄1
64
11⁄16
5 21
⁄325
1 ⁄8 7⁄8
4 1 ⁄2
4 1 ⁄1
61
3 ⁄41
5 1 ⁄2
1 1 ⁄8
11 ⁄1
6 7⁄8
7⁄8
44
1 ⁄29
7 1 ⁄2
8 5⁄8
3⁄4
5 1 ⁄4
65
5 ⁄8 7⁄8
5 1 ⁄8
4 9 ⁄1
62
1 1 ⁄4
61
1 ⁄4 3⁄4
11
55
1 ⁄211
9 1 ⁄4
8 3⁄4
3⁄4
6 5 ⁄1
67
1 ⁄26
3 ⁄41
6 1 ⁄4
5 9 ⁄1
62
1 ⁄41
1 ⁄27
1 3 ⁄8
7⁄8
1 1 ⁄8
1 1 ⁄8
66
1 ⁄212
10 1 ⁄4
12 3⁄4
3⁄4
7 5 ⁄1
68
1 ⁄27
7 ⁄81
7 1 ⁄4
6 9 ⁄1
62
1 ⁄41
1 ⁄28
1 ⁄41
3 ⁄81
1 1 ⁄8
1 1 ⁄8
6 5 ⁄8
6 23
⁄32
77
5 ⁄813
1 ⁄411
1 ⁄212
3⁄4
7⁄8
8 3 ⁄8
9 13
⁄169
1 ⁄81
8 3 ⁄8
7 23
⁄322
1 ⁄41
1 ⁄29
1 ⁄41
1 ⁄21
1 ⁄81
1 ⁄41
1 ⁄4
88
5 ⁄814
1 ⁄212
3 ⁄412
3⁄4
7⁄8
9 1 ⁄2
1110
1 ⁄41
1 ⁄89
1 ⁄28
23⁄32
2 5 ⁄8
1 3 ⁄4
10 1 ⁄4
1 1 ⁄2
1 1 ⁄4
1 1 ⁄4
1 1 ⁄4
99
5 ⁄816
1412
7⁄8
110
1 ⁄211
15⁄16
11 3 ⁄8
1 1 ⁄8
10 5 ⁄8
9 3 ⁄4
2 7 ⁄8
211
1 ⁄41
5 ⁄81
3 ⁄81
3 ⁄81
3 ⁄8
1010
3 ⁄417
1512
7⁄8
1 1 ⁄1
611
3 ⁄412
15⁄16
12 3 ⁄8
1 1 ⁄8
11 3 ⁄4
10 7 ⁄8
2 7 ⁄8
212
1 ⁄41
5 ⁄81
3 ⁄81
3 ⁄81
3 ⁄8
1212
3 ⁄419
1 ⁄417
1 ⁄416
7⁄8
1 1 ⁄8
13 3 ⁄4
15 3 ⁄1
614
5 ⁄81
1 ⁄413
7 ⁄812
29⁄32
3 1 ⁄8
2 1 ⁄4
14 1 ⁄4
1 3 ⁄4
1 1 ⁄2
1 5 ⁄8
1 1 ⁄2
1314
20 3 ⁄4
18 1 ⁄2
161
——
—15
3 ⁄41
1 ⁄415
1 ⁄414
5 ⁄32
3 3 ⁄8
2 1 ⁄2
15 1 ⁄2
1 7 ⁄8
1 5 ⁄8
1 3 ⁄4
1 5 ⁄8
1415
E)21
3 ⁄419
1 ⁄216
1—
——
16 3 ⁄4
1 3 ⁄8
16 1 ⁄4
15 5 ⁄3
23
3 ⁄82
1 ⁄216
1 ⁄21
7 ⁄81
5 ⁄81
7 ⁄81
5 ⁄8
1516
22 3 ⁄4
20 1 ⁄2
161
——
—17
7 ⁄81
3 ⁄817
1 ⁄416
3 ⁄16
3 3 ⁄8
2 1 ⁄2
17 1 ⁄2
21
3 ⁄42
1 3 ⁄4
16—
2421
3 ⁄420
1—
——
191
3 ⁄8—
——
—19
21
3 ⁄42
1 ⁄81
3 ⁄4
1718
25 1 ⁄4
2320
1—
——
20 1 ⁄8
1 1 ⁄2
——
——
202
1 ⁄81
7 ⁄82
1 ⁄41
7 ⁄8
BS 10:2009
16 • © BSI 2009
BRITISH STANDARD BRITISH STANDARD
© BSI 2009 • 17
BS 10:2009
Tab
le H
D
imen
sio
ns
of
pla
in, b
oss
, in
teg
rally
cas
t o
r fo
rged
, an
d w
eld
ing
nec
k fl
ang
es (
for
rati
ng
s se
e Ta
ble
2 a
nd
An
nex
B)
(co
nti
nu
ed)
Flan
ge
size
des
-ig
nat
ion
(n
om
inal
b
ore
of
pip
e)
Ap
pro
x-im
ate
ou
tsid
e d
iam
-et
er o
f st
eel
pip
e A
)
Dia
m-
eter
of
flan
ge
Bo
lt
circ
le
dia
m-
eter
No
. o
f b
olt
s
Dia
m-
eter
of
bo
lts
B)
Dim
ensi
on
s o
f b
oss
(F
ig. 4
) C
)D
imen
sio
ns
of
nec
ks f
or
cast
ir
on
(Fi
g. 7
)
Dim
ensi
on
s o
f st
eel w
eld
ing
n
ecks
(Fi
g. 6
)D
iam
eter
o
f ra
ised
fa
ce (
see
Cla
use
4)
(Fig
s 3,
4,
5, 6
)
Thic
knes
s o
f fl
ang
e
Bo
ss
len
gth
Dia
m-
eter
at
smal
l en
d
of
bo
ss
Max
i-m
um
d
iam
-et
er a
t ro
ot
of
bo
ss
Dia
m-
eter
at
larg
e en
d o
f n
eck
Len
gth
o
f ta
per
Dia
m-
eter
at
larg
e en
d
of
nec
k
Dia
m-
eter
at
smal
l en
d o
f n
eck
D)
Tota
l le
ng
th
of
nec
k
Len
gth
o
f ta
per
Gre
y ca
st ir
on
in
te-
gra
lly
cast
or
scre
wed
o
n w
ith
b
oss
Co
pp
er
allo
y ca
st o
r w
rou
gh
t in
teg
ral
or
bo
ss
or
pla
in
(Fig
. 3)
Cas
t o
r w
rou
gh
t st
eel i
nte
-g
ral o
r p
lain
(F
ig. 3
) o
r b
oss
(Fi
g. 4
) o
r w
eld
ing
n
eck
(Fig
. 6)
(exc
ept
for
valv
es)
Forg
ed
or
cast
st
eel
inte
-g
ral
(Fig
. 5)
(fo
r va
lves
o
nly
)
HD
PN
OA
BE
CG
JK
LM
FT 1
T 3T 7
T 9in
inin
inin
inin
inin
inin
inin
inin
inin
inin
18—
26 1 ⁄2
2420
1 1 ⁄8
——
—21
1 ⁄41
1 ⁄2—
——
—21
2 1 ⁄8
1 7 ⁄8
2 3 ⁄8
1 7 ⁄8
1920
27 3 ⁄4
25 1 ⁄4
201
1 ⁄8—
——
22 3 ⁄8
1 1 ⁄2
——
——
22 1 ⁄2
2 1 ⁄4
22
1 ⁄22
20—
2926
1 ⁄224
1 1 ⁄8
——
—23
1 ⁄21
5 ⁄8—
——
—23
1 ⁄22
1 ⁄42
2 5 ⁄8
2
2122
3027
1 ⁄224
1 1 ⁄8
——
—24
1 ⁄21
5 ⁄8—
——
—24
1 ⁄22
3 ⁄82
1 ⁄82
3 ⁄42
1 ⁄8
22—
3128
1 ⁄224
1 1 ⁄8
——
—25
1 ⁄21
3 ⁄4—
——
—25
1 ⁄22
3 ⁄82
1 ⁄82
3 ⁄42
1 ⁄8
2324
32 1 ⁄2
29 3 ⁄4
241
1 ⁄4—
——
26 1 ⁄2
1 3 ⁄4
——
——
26 1 ⁄2
2 1 ⁄2
2 1 ⁄4
32
1 ⁄4
24—
33 1 ⁄2
30 3 ⁄4
241
1 ⁄4—
——
281
3 ⁄4—
——
—27
1 ⁄22
1 ⁄22
1 ⁄43
2 1 ⁄4
A)
(H)
For
avai
lab
ility
of
stee
l pip
e si
zes,
ref
er t
o B
S EN
102
16, B
S EN
102
17. S
ee B
S 46
22 a
nd
BS
4722
fo
r o
uts
ide
dia
met
ers
of
cast
iro
n p
ipes
. See
BS
EN 1
2449
fo
r th
e si
zes
of
cop
per
pip
es f
or
use
wit
h c
op
per
allo
y fl
ang
es u
p t
o 8
in b
ore
.B
) (O
) Fo
r 5 ⁄8
in b
olt
s, t
he
dia
met
ers
of
the
ho
les
shal
l be
1 ⁄16
in la
rger
th
an t
he
bo
lts
and
fo
r 3 ⁄4
in b
olt
s an
d s
izes
ab
ove
, th
e d
iam
eter
s sh
all b
e n
ot
mo
re t
han
1 ⁄8 in
larg
er t
han
th
e b
olt
s. F
or
cast
ir
on
flan
ges
th
e d
iam
eter
s o
f th
e b
olt
ho
les
may
be
1 ⁄8 in
larg
er t
han
th
e b
olt
s o
f si
zes
5 ⁄8 in
an
d a
bo
ve.
C)
(A. B
& E
) Ta
per
s ar
e n
ot
spec
ified
bu
t sh
all b
e su
ch t
hat
th
e m
axim
um
dia
met
ers
at r
oo
t o
f b
oss
are
no
t ex
ceed
ed.
D)
(K)
The
dia
met
ers
tab
ula
ted
ap
ply
to
pip
es w
ith
ou
tsid
e d
iam
eter
s in
acc
ord
ance
wit
h H
. Fo
r p
ipes
des
ign
ated
by
thei
r b
ore
s, d
imen
sio
n K
sh
all b
e su
ch t
hat
th
e d
iffe
ren
ce b
etw
een
th
e co
rres
po
nd
ing
dia
met
ers
K a
nd
H is
mai
nta
ined
.E)
(H
) It
is r
eco
mm
end
ed t
hat
th
is s
ize
for
stee
l pip
es s
ho
uld
be
avo
ided
wh
erev
er p
oss
ible
.
BS 10:2009
18 • © BSI 2009
BRITISH STANDARD BRITISH STANDARD
© BSI 2009 • 19
BS 10:2009Ta
ble
J
Dim
ensi
on
s o
f p
lain
, bo
ss, i
nte
gra
lly c
ast
or
forg
ed, a
nd
wel
din
g n
eck
flan
ges
(fo
r ra
tin
gs
see
Tab
le 2
an
d A
nn
ex B
)
Flan
ge
size
des
-ig
nat
ion
(n
om
inal
b
ore
of
pip
e)
Ap
pro
xi-
mat
e o
uts
ide
dia
met
er
of
stee
l p
ipe
A)
Dia
m-
eter
of
flan
ge
Bo
lt
circ
le
dia
m-
eter
No
. o
f b
olt
s
Dia
m-
eter
of
bo
lts
B)
Dim
ensi
on
s o
f b
oss
(F
ig. 4
) C
)D
imen
sio
ns
of
stee
l wel
din
g n
ecks
(Fi
g.
6)D
iam
eter
o
f ra
ised
fa
ce (
see
Cla
use
4)
(Fig
s 3,
4,
5, 6
)
Thic
knes
s o
f fl
ang
e
Bo
ss
len
gth
Dia
m-
eter
at
smal
l en
d o
f b
oss
Max
i-m
um
d
iam
-et
er a
t ro
ot
of
bo
ss
Dia
met
er
at la
rge
end
of
nec
k
Dia
met
er
at s
mal
l en
d o
f n
eck
D)
Tota
l le
ng
th
of
nec
k
Len
gth
o
f ta
per
Co
pp
er
allo
y ca
st
or
wro
ug
ht
inte
gra
l o
r b
oss
or
pla
in (
Fig
. 3)
Cas
t o
r w
rou
gh
t st
eel i
nte
gra
l or
pla
in (
Fig
. 3)
or
bo
ss (
Fig
. 4)
or
wel
din
g n
eck
(Fig
. 6)
(exc
ept
for
valv
es)
Forg
ed o
r ca
st s
teel
in
teg
ral
(Fig
. 5)
(fo
r va
lves
on
ly)
HD
PN
OA
BE
JK
LM
FT 3
T 7T 9
inin
inin
inin
inin
inin
inin
inin
inin
in 1⁄2
27 ⁄3
24
1 ⁄23
1 ⁄44
5⁄8
3 ⁄81
5 ⁄16
1 7 ⁄8
1 3 ⁄1
6 7⁄8
1 1 ⁄8
5⁄8
2 1 ⁄4
5⁄8
5⁄8
5⁄8
3⁄4
1 1 ⁄1
64
1 ⁄23
1 ⁄44
5⁄8
7 ⁄16
1 1 ⁄2
1 7 ⁄8
1 3 ⁄8
1 3 ⁄3
21
1 ⁄8 5⁄8
2 1 ⁄4
5⁄8
5⁄8
5⁄8
11
11⁄32
4 3 ⁄4
3 7 ⁄1
64
5⁄8
7 ⁄16
1 7 ⁄8
2 1 ⁄1
61
11⁄16
1 3 ⁄8
1 1 ⁄8
5⁄8
2 1 ⁄2
3⁄4
3⁄4
3⁄4
1 1 ⁄4
1 11
⁄165
1 ⁄43
7 ⁄84
5⁄8
7 ⁄16
2 3 ⁄1
62
1 ⁄22
1 ⁄16
1 23
⁄321
3 ⁄8 3⁄4
3 3⁄4
3⁄4
3⁄4
1 1 ⁄2
1 29
⁄325
1 ⁄24
1 ⁄84
5⁄8
1 ⁄22
7 ⁄16
2 3 ⁄4
2 5 ⁄1
61
15⁄16
1 3 ⁄8
3⁄4
3 1 ⁄4
7⁄8
7⁄8
7⁄8
22
3 ⁄86
1 ⁄25
4 3⁄4
1 ⁄22
15⁄16
3 7 ⁄1
62
3 ⁄42
13⁄32
1 3 ⁄8
3⁄4
41
11
2 1 ⁄2
37
1 ⁄45
3 ⁄48
3⁄4
5 ⁄83
9 ⁄16
4 3 ⁄1
63
3 ⁄83
1 ⁄32
1 1 ⁄2
3⁄4
4 1 ⁄2
11
1
33
1 ⁄28
6 1 ⁄2
8 3⁄4
5 ⁄84
3 ⁄16
4 15
⁄164
3 17
⁄321
3 ⁄41
51
1 ⁄41
1 ⁄41
1 ⁄4
3 1 ⁄2
48
1 ⁄27
8 3⁄4
11⁄16
4 11
⁄165
7 ⁄16
4 1 ⁄2
4 1 ⁄1
61
3 ⁄41
5 1 ⁄2
1 1 ⁄4
1 1 ⁄4
1 1 ⁄4
44
1 ⁄29
7 1 ⁄2
8 3⁄4
3 ⁄45
1 ⁄45
13⁄16
5 1 ⁄8
4 9 ⁄1
62
1 1 ⁄4
61
3 ⁄81
3 ⁄81
3 ⁄8
55
1 ⁄211
9 1 ⁄4
8 7⁄8
3 ⁄46
5 ⁄16
7 11
⁄326
1 ⁄45
9 ⁄16
2 1 ⁄4
1 1 ⁄2
71
1 ⁄21
1 ⁄21
1 ⁄2
66
1 ⁄212
10 1 ⁄4
12 7⁄8
3 ⁄47
5 ⁄16
8 11
⁄327
1 ⁄46
9 ⁄16
2 1 ⁄4
1 1 ⁄2
8 1 ⁄4
1 1 ⁄2
1 1 ⁄2
1 1 ⁄2
6 5 ⁄8
6 23
⁄32
77
5 ⁄813
1 ⁄411
1 ⁄212
7⁄8
——
—8
3 ⁄87
23⁄32
2 1 ⁄4
1 1 ⁄2
9 1 ⁄4
1 5 ⁄8
1 5 ⁄8
1 5 ⁄8
88
5 ⁄814
1 ⁄212
3 ⁄412
7⁄8
——
—9
1 ⁄28
23⁄32
2 5 ⁄8
1 3 ⁄4
10 1 ⁄4
1 5 ⁄8
1 5 ⁄8
1 5 ⁄8
99
5 ⁄816
1412
1—
——
10 5 ⁄8
9 3 ⁄4
2 7 ⁄8
211
1 ⁄4—
1 3 ⁄4
1 3 ⁄4
1010
3 ⁄417
1512
1—
——
11 3 ⁄4
10 7 ⁄8
2 7 ⁄8
212
1 ⁄4—
1 7 ⁄8
1 7 ⁄8
1212
3 ⁄419
1 ⁄417
1 ⁄416
1—
——
13 7 ⁄8
12 29
⁄323
1 ⁄82
1 ⁄414
1 ⁄4—
22
1314
20 3 ⁄4
18 1 ⁄2
161
1 ⁄8—
——
15 1 ⁄4
14 5 ⁄3
23
3 ⁄82
1 ⁄215
1 ⁄2—
2 1 ⁄8
2
1415
E)21
3 ⁄419
1 ⁄216
1 1 ⁄8
——
—16
1 ⁄415
5 ⁄32
3 3 ⁄8
2 1 ⁄2
16 1 ⁄2
—2
1 ⁄42
1 ⁄8
1516
22 3 ⁄4
20 1 ⁄2
161
1 ⁄8—
——
17 1 ⁄4
16 3 ⁄1
63
3 ⁄82
1 ⁄217
1 ⁄2—
2 3 ⁄8
2 1 ⁄8
16—
2421
3 ⁄420
1 1 ⁄8
——
——
——
—19
—2
1 ⁄22
1 ⁄4
1718
25 1 ⁄4
2320
1 1 ⁄8
——
——
——
—20
—2
5 ⁄82
3 ⁄8
18—
26 1 ⁄2
2420
1 1 ⁄4
——
——
——
—21
—2
3 ⁄42
3 ⁄8
1920
27 3 ⁄4
25 1 ⁄4
201
1 ⁄4—
——
——
——
22 1 ⁄2
—2
7 ⁄82
1 ⁄2
BS 10:2009
18 • © BSI 2009
BRITISH STANDARD BRITISH STANDARD
© BSI 2009 • 19
BS 10:2009
Tab
le J
D
imen
sio
ns
of
pla
in, b
oss
, in
teg
rally
cas
t o
r fo
rged
, an
d w
eld
ing
nec
k fl
ang
es (
for
rati
ng
s se
e Ta
ble
2 a
nd
An
nex
B)
(co
nti
nu
ed)
Flan
ge
size
des
-ig
nat
ion
(n
om
inal
b
ore
of
pip
e)
Ap
pro
xi-
mat
e o
uts
ide
dia
met
er
of
stee
l p
ipe
A)
Dia
m-
eter
of
flan
ge
Bo
lt
circ
le
dia
m-
eter
No
. o
f b
olt
s
Dia
m-
eter
of
bo
lts
B)
Dim
ensi
on
s o
f b
oss
(F
ig. 4
) C
)D
imen
sio
ns
of
stee
l wel
din
g n
ecks
(Fi
g.
6)D
iam
eter
o
f ra
ised
fa
ce (
see
Cla
use
4)
(Fig
s 3,
4,
5, 6
)
Thic
knes
s o
f fl
ang
e
Bo
ss
len
gth
Dia
m-
eter
at
smal
l en
d o
f b
oss
Max
i-m
um
d
iam
-et
er a
t ro
ot
of
bo
ss
Dia
met
er
at la
rge
end
of
nec
k
Dia
met
er
at s
mal
l en
d o
f n
eck
D)
Tota
l le
ng
th
of
nec
k
Len
gth
o
f ta
per
Co
pp
er
allo
y ca
st
or
wro
ug
ht
inte
gra
l o
r b
oss
or
pla
in (
Fig
. 3)
Cas
t o
r w
rou
gh
t st
eel i
nte
gra
l or
pla
in (
Fig
. 3)
or
bo
ss (
Fig
. 4)
or
wel
din
g n
eck
(Fig
. 6)
(exc
ept
for
valv
es)
Forg
ed o
r ca
st s
teel
in
teg
ral
(Fig
. 5)
(fo
r va
lves
on
ly)
HD
PN
OA
BE
JK
LM
FT 3
T 7T 9
inin
inin
inin
inin
inin
inin
inin
inin
in
20—
2926
1 ⁄224
1 1 ⁄4
——
——
——
—23
1 ⁄2—
3 1 ⁄8
2 1 ⁄2
2122
3027
1 ⁄224
1 1 ⁄4
——
——
——
—24
1 ⁄2—
3 1 ⁄4
2 5 ⁄8
22—
3128
1 ⁄224
1 1 ⁄4
——
——
——
—25
1 ⁄2—
3 3 ⁄8
2 5 ⁄8
2324
32 1 ⁄2
29 3 ⁄4
241
3 ⁄8—
——
——
——
26 1 ⁄2
—3
1 ⁄22
3 ⁄4
24—
33 1 ⁄2
30 3 ⁄4
241
3 ⁄8—
——
——
——
27 1 ⁄2
—3
5 ⁄82
3 ⁄4A
) (H
) Fo
r av
aila
bili
ty o
f st
eel p
ipe
size
s, r
efer
to
BS
EN 1
0216
, BS
EN 1
0217
. See
BS
4622
an
d B
S 47
22 a
nd
BS
EN 1
2449
fo
r th
e si
zes
of
cop
per
pip
es f
or
use
wit
h c
op
per
allo
y fl
ang
es u
p t
o 8
in
bo
re.
B)
(O)
For
5 ⁄8 in
bo
lts,
th
e d
iam
eter
s o
f th
e h
ole
s sh
all b
e 1 ⁄1
6 in
larg
er t
han
th
e b
olt
s an
d f
or
3 ⁄4 in
bo
lts
and
siz
es a
bo
ve, t
he
dia
met
ers
shal
l be
no
t m
ore
th
an 1 ⁄8
in la
rger
th
an t
he
bo
lts.
C)
(A. B
& E
) Ta
per
s ar
e n
ot
spec
ified
bu
t sh
all b
e su
ch t
hat
th
e m
axim
um
dia
met
ers
at r
oo
t o
f b
oss
are
no
t ex
ceed
ed.
D)
(K)
The
dia
met
ers
tab
ula
ted
ap
ply
to
pip
es w
ith
ou
tsid
e d
iam
eter
s in
acc
ord
ance
wit
h H
. Fo
r p
ipes
des
ign
ated
by
thei
r b
ore
s, d
imen
sio
n K
sh
all b
e su
ch t
hat
th
e d
iffe
ren
ce b
etw
een
th
e co
rres
po
nd
ing
dia
met
ers
K a
nd
H is
mai
nta
ined
.E)
(H
) It
is r
eco
mm
end
ed t
hat
th
is s
ize
for
stee
l pip
es s
ho
uld
be
avo
ided
wh
erev
er p
oss
ible
.
Tab
le K
D
imen
sio
ns
of
pla
in, i
nte
gra
lly c
ast
or
forg
ed, a
nd
wel
din
g n
eck
flan
ges
(fo
r ra
tin
gs
see
Tab
le 2
an
d A
nn
ex B
)
Flan
ge
size
d
esig
nat
ion
(n
om
inal
b
ore
of
pip
e)
Ap
pro
xi-
mat
e o
uts
ide
dia
met
er
of
stee
l p
ipe
A)
Dia
met
er
of
flan
ge
Bo
lt
circ
le
dia
m-
eter
No
. of
bo
lts
Dia
m-
eter
of
bo
lts
B)
Dim
ensi
on
s o
f st
eel w
eld
ing
nec
ks (
Fig
. 6)
Dia
met
er o
f ra
ised
fac
e (s
ee C
lau
se 4
) (F
igs
3, 5
, 6)
Thic
knes
s o
f fl
ang
e
Dia
met
er
at la
rge
end
of
nec
k
Dia
met
er
at s
mal
l en
d o
f n
eck
C)
Tota
l le
ng
th o
f n
eck
Len
gth
of
tap
erC
op
per
allo
y ca
st o
r w
rou
gh
t in
teg
ral o
r b
oss
o
r p
lain
(Fi
g. 3
)
Cas
t o
r w
rou
gh
t st
eel i
nte
gra
l or
pla
in (
Fig
. 3)
or
wel
din
g n
eck
(Fig
. 6)
(exc
ept
for
valv
es)
Forg
ed o
r ca
st s
teel
in
teg
ral
(Fig
. 5)
(fo
r va
lves
on
ly)
HD
PN
OJ
KL
MF
T 3T 8
T 9in
inin
inin
inin
inin
inin
inin
1⁄2
27 ⁄3
24
1 ⁄23
1 ⁄44
5 ⁄81
3 ⁄16
7⁄8
1 1 ⁄8
5 ⁄82
1 ⁄23 ⁄4
3 ⁄43 ⁄4
3⁄4
1 1 ⁄1
64
1 ⁄23
1 ⁄44
5 ⁄81
3 ⁄81
3 ⁄32
1 1 ⁄8
5 ⁄82
1 ⁄23 ⁄4
3 ⁄43 ⁄4
11
11⁄32
53
3 ⁄44
5 ⁄81
3 ⁄41
3 ⁄81
3 ⁄83 ⁄4
37 ⁄8
7 ⁄87 ⁄8
1 1 ⁄4
1 11
⁄165
1 ⁄43
7 ⁄84
5 ⁄82
1 ⁄16
1 23
⁄321
3 ⁄83 ⁄4
37 ⁄8
7 ⁄87 ⁄8
BS 10:2009
20 • © BSI 2009
BRITISH STANDARD BRITISH STANDARD
© BSI 2009 • 21
BS 10:2009Ta
ble
K
Dim
ensi
on
s o
f p
lain
, in
teg
rally
cas
t o
r fo
rged
, an
d w
eld
ing
nec
k fl
ang
es (
for
rati
ng
s se
e Ta
ble
2 a
nd
An
nex
B)
(co
nti
nu
ed)
Flan
ge
size
d
esig
nat
ion
(n
om
inal
b
ore
of
pip
e)
Ap
pro
xi-
mat
e o
uts
ide
dia
met
er
of
stee
l p
ipe
A)
Dia
met
er
of
flan
ge
Bo
lt
circ
le
dia
m-
eter
No
. of
bo
lts
Dia
m-
eter
of
bo
lts
B)
Dim
ensi
on
s o
f st
eel w
eld
ing
nec
ks (
Fig
. 6)
Dia
met
er o
f ra
ised
fac
e (s
ee C
lau
se 4
) (F
igs
3, 5
, 6)
Thic
knes
s o
f fl
ang
e
Dia
met
er
at la
rge
end
of
nec
k
Dia
met
er
at s
mal
l en
d o
f n
eck
C)
Tota
l le
ng
th o
f n
eck
Len
gth
of
tap
erC
op
per
allo
y ca
st o
r w
rou
gh
t in
teg
ral o
r b
oss
o
r p
lain
(Fi
g. 3
)
Cas
t o
r w
rou
gh
t st
eel i
nte
gra
l or
pla
in (
Fig
. 3)
or
wel
din
g n
eck
(Fig
. 6)
(exc
ept
for
valv
es)
Forg
ed o
r ca
st s
teel
in
teg
ral
(Fig
. 5)
(fo
r va
lves
on
ly)
HD
PN
OJ
KL
MF
T 3T 8
T 9in
inin
inin
inin
inin
inin
inin
1 1 ⁄2
1 29
⁄326
4 1 ⁄2
4 3⁄4
2 5 ⁄1
61
15⁄16
1 3 ⁄8
3⁄4
3 1 ⁄2
11
1
22
3 ⁄86
1 ⁄25
8 5⁄8
2 3 ⁄4
2 13
⁄321
3 ⁄8 3⁄4
41
11
2 1 ⁄2
37
1 ⁄45
3 ⁄48
3⁄4
3 3 ⁄8
3 1 ⁄3
21
1 ⁄2 3⁄4
4 1 ⁄2
1 1 ⁄8
1 1 ⁄8
1 1 ⁄8
33
1 ⁄28
6 1 ⁄2
8 3⁄4
43
17⁄32
1 3 ⁄4
15
1 1 ⁄4
1 1 ⁄4
1 1 ⁄4
3 1 ⁄2
49
7 1 ⁄4
8 7⁄8
4 1 ⁄2
4 1 ⁄1
61
3 ⁄41
5 1 ⁄2
1 1 ⁄4
1 1 ⁄4
1 1 ⁄4
44
1 ⁄29
1 ⁄27
3 ⁄48
7⁄8
5 1 ⁄8
4 9 ⁄1
62
1 1 ⁄4
61
3 ⁄81
3 ⁄81
3 ⁄8
55
1 ⁄211
9 1 ⁄4
12 7⁄8
6 1 ⁄4
5 9 ⁄1
62
1 ⁄41
1 ⁄27
1 5 ⁄8
1 5 ⁄8
1 5 ⁄8
66
5 ⁄812
10 1 ⁄4
12 7⁄8
7 1 ⁄4
6 23
⁄322
1 ⁄41
1 ⁄28
1 ⁄41
5 ⁄81
5 ⁄81
5 ⁄8
77
5 ⁄813
1 ⁄211
1 ⁄212
18
3 ⁄87
23⁄32
2 1 ⁄4
1 1 ⁄2
9 1 ⁄4
1 3 ⁄4
1 3 ⁄4
1 3 ⁄4
88
5 ⁄814
1 ⁄212
1 ⁄212
19
1 ⁄28
23⁄32
2 5 ⁄8
1 3 ⁄4
10 1 ⁄4
1 7 ⁄8
1 7 ⁄8
1 7 ⁄8
99
5 ⁄816
1416
110
5 ⁄89
3 ⁄42
7 ⁄82
11 1 ⁄4
—2
2
1010
3 ⁄417
1516
111
3 ⁄410
7 ⁄82
7 ⁄82
12 1 ⁄4
—2
2
1212
3 ⁄419
1 ⁄417
161
1 ⁄813
7 ⁄812
29⁄32
3 1 ⁄4
2 1 ⁄4
14 1 ⁄4
—2
1 ⁄42
1 ⁄4
1314
21 1 ⁄2
1916
1 1 ⁄4
15 3 ⁄8
14 5 ⁄3
23
3 ⁄42
3 ⁄415
1 ⁄2—
2 1 ⁄2
2 3 ⁄8
1415
D)
22 1 ⁄2
2016
1 1 ⁄4
16 3 ⁄8
15 5 ⁄3
23
3 ⁄42
3 ⁄416
1 ⁄2—
2 5 ⁄8
2 3 ⁄8
1516
23 3 ⁄4
21 1 ⁄4
201
1 ⁄417
1 ⁄216
3 ⁄16
4 1 ⁄8
317
1 ⁄2—
2 7 ⁄8
2 1 ⁄2
16—
24 3 ⁄4
22 1 ⁄4
201
1 ⁄4—
——
—19
—3
2 5 ⁄8
1718
25 3 ⁄4
23 1 ⁄2
201
1 ⁄419
1 ⁄218
3 ⁄16
4 3 ⁄8
320
—3
1 ⁄42
7 ⁄8
1820
28 1 ⁄4
25 3 ⁄4
201
3 ⁄821
3 ⁄420
1 ⁄44
3 ⁄83
22 1 ⁄2
—3
1 ⁄23
2022
3128
201
1 ⁄223
1 ⁄222
1 ⁄44
5 ⁄83
1 ⁄424
1 ⁄2—
3 7 ⁄8
3 1 ⁄4
2224
34 1 ⁄4
30 3 ⁄4
202
25 1 ⁄4
24 1 ⁄4
4 5 ⁄8
3 1 ⁄4
26 1 ⁄2
—4
1 ⁄83
1 ⁄2A
) (H
) Fo
r av
aila
bili
ty o
f st
eel p
ipe
size
s, r
efer
to
BS
EN 1
0216
, BS
EN 1
0217
. See
BS
4622
an
d B
S 47
22. S
ee B
S EN
124
49 f
or
the
size
s o
f co
pp
er p
ipes
fo
r u
se w
ith
co
pp
er a
lloy
flan
ges
up
to
8 in
b
ore
.B
) (O
) Fo
r 5/
8 in
bo
lts,
th
e d
iam
eter
s o
f th
e h
ole
s sh
all b
e 1/
16 in
larg
er t
han
th
e b
olt
s an
d f
or
3/4
in b
olt
s an
d s
izes
ab
ove
, th
e d
iam
eter
s sh
all b
e n
ot
mo
re t
han
1/8
in la
rger
th
an t
he
bo
lts.
C)
(K)
The
dia
met
ers
tab
ula
ted
ap
ply
to
pip
es w
ith
ou
tsid
e d
iam
eter
s in
acc
ord
ance
wit
h H
. Fo
r p
ipes
des
ign
ated
by
thei
r b
ore
s, d
imen
sio
n K
sh
all b
e su
ch t
hat
th
e d
iffe
ren
ce b
etw
een
th
e co
rres
po
nd
ing
dia
met
ers
K a
nd
H is
mai
nta
ined
.D
) (H
) It
is r
eco
mm
end
ed t
hat
th
is s
ize
for
stee
l pip
es s
ho
uld
be
avo
ided
wh
erev
er p
oss
ible
.
BS 10:2009
20 • © BSI 2009
BRITISH STANDARD BRITISH STANDARD
© BSI 2009 • 21
BS 10:2009
Tab
le R
D
imen
sio
ns
of
pla
in, i
nte
gra
lly c
ast
or
forg
ed, a
nd
wel
din
g n
eck
flan
ges
(fo
r ra
tin
gs
see
Tab
le 2
an
d A
nn
ex B
)
Flan
ge
size
d
esig
nat
ion
(n
om
inal
b
ore
of
pip
e)
Ap
pro
xi-
mat
e o
uts
ide
dia
met
er
of
stee
l p
ipe
A)
Dia
m-
eter
of
flan
ge
Bo
lt
circ
le
dia
m-
eter
No
. of
bo
lts
Dia
met
er
of
bo
lts
B)
Dim
ensi
on
s o
f n
ecks
fo
r in
teg
rally
cas
t o
r fo
rged
ste
el fl
ang
es
(Fig
. 5)
(val
ves
on
ly)
Dim
ensi
on
s o
f st
eel w
eld
ing
nec
ks (
Fig
. 6)
Dia
met
er
of
rais
ed
face
(se
e C
lau
se 4
) (F
igs
3, 5
, 6)
Thic
knes
s o
f fl
ang
e
Dia
met
er
at la
rge
end
of
nec
k
Len
gth
of
tap
erD
iam
eter
at
larg
e en
d o
f n
eck
Dia
met
er
at s
mal
l en
d o
f n
eck
C)
Tota
l le
ng
th
of
nec
k
Len
gth
of
tap
erC
ast
or
wro
ug
ht
stee
l in
teg
ral o
r p
lain
(Fi
g. 3
) o
r w
eld
ing
nec
k (F
ig. 6
) (e
xcep
t fo
r va
lves
)
Forg
ed o
r ca
st
stee
l in
teg
ral
(Fig
. 5)
(fo
r va
lves
on
ly)
HD
PN
OC
GJ
KL
MF
T 8T 9
inin
inin
inin
inin
inin
inin
inin
1⁄2
27 ⁄3
24
1 ⁄23
1 ⁄44
5⁄8
1 1 ⁄4
3⁄4
1 3 ⁄1
6 7⁄8
1 1 ⁄8
5⁄8
2 1 ⁄2
3⁄4
3⁄4
3⁄4
1 1 ⁄1
64
1 ⁄23
1 ⁄44
5⁄8
1 1 ⁄2
3⁄4
1 3 ⁄8
1 3 ⁄3
21
1 ⁄8 5⁄8
2 1 ⁄2
3⁄4
3⁄4
11
11⁄32
53
3 ⁄44
5⁄8
1 3 ⁄4
7⁄8
1 3 ⁄4
1 3 ⁄8
1 3 ⁄8
3⁄4
3 7⁄8
7⁄8
1 1 ⁄4
1 11
⁄165
1 ⁄43
7 ⁄84
5⁄8
2 1 ⁄8
7⁄8
2 1 ⁄1
61
23⁄32
1 3 ⁄8
3⁄4
3 7⁄8
7⁄8
1 1 ⁄2
1 29
⁄326
4 1 ⁄2
4 3⁄4
2 3 ⁄8
12
5 ⁄16
1 15
⁄161
3 ⁄8 3⁄4
3 1 ⁄2
11
22
3 ⁄86
1 ⁄25
8 5⁄8
31
2 3 ⁄4
2 13
⁄321
3 ⁄8 3⁄4
41
1
2 1 ⁄2
37
1 ⁄45
3 ⁄48
3⁄4
3 7 ⁄8
1 1 ⁄8
3 3 ⁄8
3 1 ⁄3
21
1 ⁄2 3⁄4
4 1 ⁄2
1 1 ⁄8
1 1 ⁄8
33
1 ⁄28
6 1 ⁄2
8 3⁄4
4 1 ⁄2
1 1 ⁄4
43
17⁄32
1 3 ⁄4
15
1 1 ⁄4
1 1 ⁄4
3 1 ⁄2
49
7 1 ⁄4
8 7⁄8
5 1 ⁄8
1 1 ⁄4
4 1 ⁄2
4 1 ⁄1
61
3 ⁄41
5 1 ⁄2
1 1 ⁄4
1 1 ⁄4
44
1 ⁄29
1 ⁄27
3 ⁄48
7⁄8
5 3 ⁄4
1 3 ⁄8
5 1 ⁄8
4 9 ⁄1
62
1 1 ⁄4
61
3 ⁄81
3 ⁄8
55
1 ⁄211
9 1 ⁄4
12 7⁄8
6 7 ⁄8
1 5 ⁄8
6 1 ⁄4
5 9 ⁄1
62
1 ⁄41
1 ⁄27
1 5 ⁄8
1 5 ⁄8
66
5 ⁄812
10 1 ⁄4
12 7⁄8
81
3 ⁄47
3 ⁄86
23⁄32
2 5 ⁄8
1 3 ⁄4
8 1 ⁄4
1 3 ⁄4
1 3 ⁄4
77
5 ⁄813
1 ⁄211
1 ⁄212
19
1 ⁄41
7 ⁄88
1 ⁄27
23⁄32
2 5 ⁄8
1 3 ⁄4
9 1 ⁄4
1 7 ⁄8
1 7 ⁄8
88
5 ⁄814
1 ⁄212
3 ⁄412
110
1 ⁄42
9 5 ⁄8
8 23
⁄322
7 ⁄82
10 1 ⁄4
22
99
5 ⁄816
1416
111
1 ⁄22
1 ⁄810
5 ⁄89
3 ⁄43
211
1 ⁄42
1 ⁄82
1 ⁄8
1010
3 ⁄417
15 1 ⁄4
161
12 1 ⁄2
2 1 ⁄4
1210
7 ⁄83
5 ⁄82
1 ⁄212
1 ⁄42
3 ⁄82
1 ⁄4
1212
3 ⁄420
1816
1 1 ⁄8
152
1 ⁄214
1 ⁄812
29⁄32
42
3 ⁄414
1 ⁄42
3 ⁄42
1 ⁄2
1314
21 3 ⁄4
19 1 ⁄2
161
1 ⁄416
1 ⁄22
5 ⁄815
1 ⁄214
5 ⁄32
4 1 ⁄4
315
1 ⁄22
7 ⁄82
5 ⁄8
1415
D)
2320
3 ⁄416
1 1 ⁄4
17 3 ⁄4
2 3 ⁄4
16 5 ⁄8
15 5 ⁄3
24
1 ⁄23
1 ⁄416
1 ⁄23
1 ⁄82
3 ⁄4
1516
2421
3 ⁄420
1 1 ⁄4
18 3 ⁄4
2 7 ⁄8
17 3 ⁄4
16 3 ⁄1
64
7 ⁄83
1 ⁄217
1 ⁄23
1 ⁄42
7 ⁄8
16—
25 1 ⁄4
2320
1 1 ⁄4
203
——
——
193
1 ⁄23
1718
26 1 ⁄2
2420
1 1 ⁄4
213
1 ⁄820
18 3 ⁄1
65
1 ⁄83
3 ⁄420
3 5 ⁄8
3 1 ⁄8
1820
2926
1 ⁄220
1 3 ⁄8
233
1 ⁄422
1 ⁄220
1 ⁄45
3 ⁄84
223
7 ⁄83
1 ⁄4
BS 10:2009
22 • © BSI 2009
BRITISH STANDARD BRITISH STANDARD
© BSI 2009 • 23
BS 10:2009Ta
ble
R
Dim
ensi
on
s o
f p
lain
, in
teg
rally
cas
t o
r fo
rged
, an
d w
eld
ing
nec
k fl
ang
es (
for
rati
ng
s se
e Ta
ble
2 a
nd
An
nex
B)
(co
nti
nu
ed)
Flan
ge
size
d
esig
nat
ion
(n
om
inal
b
ore
of
pip
e)
Ap
pro
xi-
mat
e o
uts
ide
dia
met
er
of
stee
l p
ipe
A)
Dia
m-
eter
of
flan
ge
Bo
lt
circ
le
dia
m-
eter
No
. of
bo
lts
Dia
met
er
of
bo
lts
B)
Dim
ensi
on
s o
f n
ecks
fo
r in
teg
rally
cas
t o
r fo
rged
ste
el fl
ang
es
(Fig
. 5)
(val
ves
on
ly)
Dim
ensi
on
s o
f st
eel w
eld
ing
nec
ks (
Fig
. 6)
Dia
met
er
of
rais
ed
face
(se
e C
lau
se 4
) (F
igs
3, 5
, 6)
Thic
knes
s o
f fl
ang
e
Dia
met
er
at la
rge
end
of
nec
k
Len
gth
of
tap
erD
iam
eter
at
larg
e en
d o
f n
eck
Dia
met
er
at s
mal
l en
d o
f n
eck
C)
Tota
l le
ng
th
of
nec
k
Len
gth
of
tap
erC
ast
or
wro
ug
ht
stee
l in
teg
ral o
r p
lain
(Fi
g. 3
) o
r w
eld
ing
nec
k (F
ig. 6
) (e
xcep
t fo
r va
lves
)
Forg
ed o
r ca
st
stee
l in
teg
ral
(Fig
. 5)
(fo
r va
lves
on
ly)
HD
PN
OC
GJ
KL
MF
T 8T 9
inin
inin
inin
inin
inin
inin
inin
2022
31 3 ⁄4
28 3 ⁄4
201
1 ⁄225
3 1 ⁄2
24 1 ⁄4
22 1 ⁄4
5 3 ⁄8
424
1 ⁄24
1 ⁄83
1 ⁄2
2224
35 1 ⁄4
31 3 ⁄4
202
27 1 ⁄2
3 3 ⁄4
26 1 ⁄4
24 1 ⁄4
5 5 ⁄8
4 1 ⁄4
26 1 ⁄2
4 1 ⁄2
3 3 ⁄4
A)
(H)
For
avai
lab
ility
of
stee
l pip
e si
zes,
ref
er t
o B
S EN
102
16, B
S EN
102
17.
B)
(O)
For
5 ⁄8 in
bo
lts,
th
e d
iam
eter
s o
f th
e h
ole
s sh
all b
e 1 ⁄1
6 in
larg
er t
han
th
e b
olt
s an
d f
or
3 ⁄4 in
bo
lts
and
siz
es a
bo
ve, t
he
dia
met
ers
shal
l be
no
t m
ore
th
an 1 ⁄8
in la
rger
th
an t
he
bo
lts.
C)
(K)
The
dia
met
ers
tab
ula
ted
ap
ply
to
pip
es w
ith
ou
tsid
e d
iam
eter
s in
acc
ord
ance
wit
h H
. Fo
r p
ipes
des
ign
ated
by
thei
r b
ore
s, d
imen
sio
n K
sh
all b
e su
ch t
hat
th
e d
iffe
ren
ce b
etw
een
th
e co
rres
po
nd
ing
dia
met
ers
K a
nd
H is
mai
nta
ined
.D
) (H
) It
is r
eco
mm
end
ed t
hat
th
is s
ize
for
stee
l pip
es s
ho
uld
be
avo
ided
wh
erev
er p
oss
ible
.
Tab
le S
D
imen
sio
ns
of
pla
in, i
nte
gra
lly c
ast
or
forg
ed, a
nd
wel
din
g n
eck
flan
ges
(fo
r ra
tin
gs
see
Tab
le 2
an
d A
nn
ex B
)
Flan
ge
size
d
esig
nat
ion
(n
om
inal
b
ore
of
pip
e)
Ap
pro
xi-
mat
e o
uts
ide
dia
met
er
of
stee
l p
ipe
A)
Dia
met
er
of
flan
ge
Bo
lt
circ
le
dia
met
er
No
. of
bo
lts
Dia
met
er
of
bo
lts
B)
Dim
ensi
on
s o
f n
ecks
fo
r in
teg
rally
cas
t o
r fo
rged
ste
el fl
ang
es
(Fig
. 5)
(val
ves
on
ly)
Dim
ensi
on
s o
f st
eel w
eld
ing
nec
ks (
Fig
. 6)
Dia
met
er
of
rais
ed
face
(se
e C
lau
se 4
) (F
igs
3, 5
, 6)
Thic
knes
s o
f fl
ang
e
Dia
met
er
at la
rge
end
of
nec
k
Len
gth
of
tap
erD
iam
eter
at
larg
e en
d o
f n
eck
Dia
met
er
at s
mal
l en
d o
f n
eck
C)
Tota
l le
ng
th
of
nec
k
Len
gth
of
tap
erC
ast
or
wro
ug
ht
stee
l in
teg
ral o
r p
lain
(Fi
g. 3
) o
r w
eld
ing
nec
k (F
ig. 6
) (e
xcep
t fo
r va
lves
)
Forg
ed o
r ca
st s
teel
in
teg
ral
(Fig
. 5)
(fo
r va
lves
on
ly)
HD
PN
OC
GJ
KL
MF
T 8T 9
inin
inin
inin
inin
inin
inin
inin
1⁄2
27 ⁄3
25
3 1 ⁄2
43 ⁄4
1 3 ⁄8
7 ⁄81
5 ⁄16
7 ⁄81
1 ⁄2 7⁄8
2 1 ⁄2
7⁄8
7⁄8
3⁄4
1 1 ⁄1
65
3 1 ⁄2
43 ⁄4
1 5 ⁄8
7 ⁄81
1 ⁄21
3 ⁄32
1 1 ⁄2
7⁄8
2 1 ⁄2
7⁄8
7⁄8
11
11⁄32
5 1 ⁄2
44
3 ⁄42
11
7 ⁄81
3 ⁄81
3 ⁄41
31
1
1 1 ⁄4
1 11
⁄165
3 ⁄44
1 ⁄44
3 ⁄42
1 ⁄41
1 ⁄82
1 ⁄41
23⁄32
1 7 ⁄8
1 1 ⁄8
3 1 ⁄4
1 1 ⁄8
1 1 ⁄8
1 1 ⁄2
1 29
⁄326
1 ⁄44
3 ⁄44
3 ⁄42
1 ⁄21
1 ⁄82
9 ⁄16
1 15
⁄162
1 1 ⁄4
3 1 ⁄2
1 1 ⁄8
1 1 ⁄8
22
3 ⁄86
3 ⁄45
1 ⁄48
3 ⁄43
1 ⁄81
1 ⁄43
2 13
⁄322
1 1 ⁄4
3 1 ⁄2
1 1 ⁄4
1 1 ⁄4
BS 10:2009
22 • © BSI 2009
BRITISH STANDARD BRITISH STANDARD
© BSI 2009 • 23
BS 10:2009
Tab
le S
D
imen
sio
ns
of
pla
in, i
nte
gra
lly c
ast
or
forg
ed, a
nd
wel
din
g n
eck
flan
ges
(fo
r ra
tin
gs
see
Tab
le 2
an
d A
nn
ex B
) (c
on
tin
ued
)
Flan
ge
size
d
esig
nat
ion
(n
om
inal
b
ore
of
pip
e)
Ap
pro
xi-
mat
e o
uts
ide
dia
met
er
of
stee
l p
ipe
A)
Dia
met
er
of
flan
ge
Bo
lt
circ
le
dia
met
er
No
. of
bo
lts
Dia
met
er
of
bo
lts
B)
Dim
ensi
on
s o
f n
ecks
fo
r in
teg
rally
cas
t o
r fo
rged
ste
el fl
ang
es
(Fig
. 5)
(val
ves
on
ly)
Dim
ensi
on
s o
f st
eel w
eld
ing
nec
ks (
Fig
. 6)
Dia
met
er
of
rais
ed
face
(se
e C
lau
se 4
) (F
igs
3, 5
, 6)
Thic
knes
s o
f fl
ang
e
Dia
met
er
at la
rge
end
of
nec
k
Len
gth
of
tap
erD
iam
eter
at
larg
e en
d o
f n
eck
Dia
met
er
at s
mal
l en
d o
f n
eck
C)
Tota
l le
ng
th
of
nec
k
Len
gth
of
tap
erC
ast
or
wro
ug
ht
stee
l in
teg
ral o
r p
lain
(Fi
g. 3
) o
r w
eld
ing
nec
k (F
ig. 6
) (e
xcep
t fo
r va
lves
)
Forg
ed o
r ca
st s
teel
in
teg
ral
(Fig
. 5)
(fo
r va
lves
on
ly)
HD
PN
OC
GJ
KL
MF
T 8T 9
inin
inin
inin
inin
inin
inin
inin
2 1 ⁄2
37
1 ⁄45
3 ⁄48
3⁄4
4 1 ⁄8
1 1 ⁄4
3 5 ⁄8
3 1 ⁄3
22
1 ⁄81
1 ⁄44
1 1 ⁄4
1 1 ⁄4
33
1 ⁄28
6 1 ⁄2
8 7⁄8
4 5 ⁄8
1 3 ⁄8
4 1 ⁄8
3 17
⁄322
1 ⁄81
1 ⁄44
1 ⁄21
3 ⁄81
3 ⁄8
3 1 ⁄2
49
1 ⁄47
1 ⁄28
7⁄8
5 1 ⁄4
1 1 ⁄2
4 5 ⁄8
4 1 ⁄1
62
1 ⁄81
1 ⁄45
1 1 ⁄2
1 1 ⁄2
45
9 3 ⁄4
88
15
3 ⁄41
5 ⁄85
1 ⁄25
1 ⁄16
2 3 ⁄8
1 1 ⁄2
6 1 ⁄4
1 5 ⁄8
1 5 ⁄8
4 1 ⁄2
5 1 ⁄2
10 1 ⁄2
8 1 ⁄2
81
6 1 ⁄4
1 5 ⁄8
65
9 ⁄16
2 3 ⁄8
1 1 ⁄2
71
5 ⁄81
5 ⁄8
56
11 1 ⁄4
9 1 ⁄4
127 ⁄8
71
3 ⁄46
3 ⁄46
1 ⁄16
2 3 ⁄8
1 1 ⁄2
7 1 ⁄2
1 3 ⁄4
1 3 ⁄4
66
5 ⁄812
3 ⁄410
3 ⁄412
18
3 ⁄82
7 5 ⁄8
6 23
⁄323
28
1 ⁄42
27
87
3 ⁄32
77
5 ⁄814
3 ⁄412
1 ⁄212
1 1 ⁄8
9 7 ⁄8
2 1 ⁄4
9 5 ⁄8
7 23
⁄323
29
3 ⁄42
1 ⁄42
1 ⁄48
5 ⁄88
23⁄32
89
5 ⁄816
1 ⁄414
121
1 ⁄411
1 ⁄82
1 ⁄210
3 ⁄49
3 ⁄43
3 ⁄82
1 ⁄410
3 ⁄42
1 ⁄22
1 ⁄2
910
3 ⁄417
1 ⁄415
1 ⁄416
1 1 ⁄8
12 1 ⁄4
2 5 ⁄8
12 1 ⁄8
10 7 ⁄8
42
3 ⁄411
3 ⁄42
7 ⁄82
5 ⁄8
1011
3 ⁄4 D
)19
16 3 ⁄4
161
1 ⁄413
1 ⁄22
7 ⁄813
1 ⁄411
7 ⁄84
3 ⁄83
133
1 ⁄82
7 ⁄8
1112
3 ⁄421
18 1 ⁄2
161
3 ⁄814
3 ⁄43
1 ⁄814
1 ⁄212
29⁄32
53
1 ⁄214
3 3 ⁄8
3 1 ⁄8
1214
22 3 ⁄4
2016
1 1 ⁄2
163
1 ⁄415
3 ⁄414
5 ⁄32
53
1 ⁄215
3 5 ⁄8
3 1 ⁄4
1315
D)
2421
1 ⁄416
1 1 ⁄2
17 1 ⁄4
3 1 ⁄2
16 7 ⁄8
15 5 ⁄3
25
1 ⁄43
3 ⁄416
1 ⁄43
7 ⁄83
1 ⁄2
1416
25 1 ⁄2
22 3 ⁄4
201
1 ⁄218
1 ⁄23
3 ⁄418
16 3 ⁄1
65
5 ⁄84
17 1 ⁄4
4 1 ⁄8
3 3 ⁄4
15—
27 1 ⁄2
24 1 ⁄2
201
5 ⁄819
3 ⁄44
——
——
18 1 ⁄2
4 3 ⁄8
4
1618
29 1 ⁄4
2620
1 3 ⁄4
20 3 ⁄4
4 1 ⁄4
20 1 ⁄4
18 3 ⁄1
66
1 ⁄44
1 ⁄219
1 ⁄24
5 ⁄84
1 ⁄4A
) (H
) Fo
r av
aila
bili
ty o
f st
eel p
ipe
size
s, r
efer
to
BS
EN 1
0216
, BS
EN 1
0217
.B
) (O
) Th
e d
iam
eter
s o
f th
e b
olt
ho
les
shal
l be
no
t m
ore
th
an 1 ⁄8
in la
rger
th
an t
he
bo
lts.
C)
(K)
The
dia
met
ers
tab
ula
ted
ap
ply
to
pip
es w
ith
ou
tsid
e d
iam
eter
s in
acc
ord
ance
wit
h H
. Fo
r p
ipes
des
ign
ated
by
thei
r b
ore
s, d
imen
sio
n K
sh
all b
e su
ch t
hat
th
e d
iffe
ren
ce b
etw
een
th
e co
rres
po
nd
ing
dia
met
ers
K a
nd
H is
mai
nta
ined
.D
) (H
) It
is r
eco
mm
end
ed t
hat
th
is s
ize
for
stee
l pip
es s
ho
uld
be
avo
ided
wh
erev
er p
oss
ible
.
BS 10:2009
24 • © BSI 2009
BRITISH STANDARD BRITISH STANDARD
© BSI 2009 • 25
BS 10:2009Ta
ble
T
Dim
ensi
on
s o
f p
lain
, in
teg
rally
cas
t o
r fo
rged
, an
d w
eld
ing
nec
k fl
ang
es (
for
rati
ng
s se
e Ta
ble
2 a
nd
An
nex
B)
Flan
ge
size
d
esig
nat
ion
(n
om
inal
b
ore
of
pip
e)
Ap
pro
xi-
mat
e o
uts
ide
dia
met
er
of
stee
l p
ipe
A)
Dia
met
er
of
flan
ge
Bo
lt
circ
le
dia
met
er
No
. of
bo
lts
Dia
met
er
of
bo
lts
B)
Dim
ensi
on
s o
f n
ecks
fo
r in
teg
rally
cas
t o
r fo
rged
ste
el fl
ang
es
(Fig
. 5)
(val
ves
on
ly)
Dim
ensi
on
s o
f st
eel w
eld
ing
nec
ks (
Fig
. 6)
Dia
met
er
of
rais
ed
face
(se
e C
lau
se 4
) (F
igs
3, 5
, 6)
Thic
knes
s o
f fl
ang
e
Dia
met
er
at la
rge
end
of
nec
k
Len
gth
of
tap
erD
iam
eter
at
larg
e en
d o
f n
eck
Dia
met
er
at s
mal
l en
d o
f n
eck
C)
Tota
l le
ng
th
of
nec
k
Len
gth
of
tap
erC
ast
or
wro
ug
ht
stee
l in
teg
ral o
r p
lain
(Fi
g. 3
) o
r w
eld
ing
nec
k (F
ig. 6
) (e
xcep
t fo
r va
lves
)
Forg
ed o
r ca
st s
teel
in
teg
ral
(Fig
. 5)
(fo
r va
lves
on
ly)
HD
PN
OC
GJ
KL
MF
T 8T 9
inin
inin
inin
inin
inin
inin
inin
1⁄2
27 ⁄3
25
1 ⁄24
4 3⁄4
1 3 ⁄4
11
5 ⁄16
7⁄8
1 1 ⁄2
7⁄8
2 1 ⁄2
11
3⁄4
1 1 ⁄1
65
1 ⁄24
4 3⁄4
21
1 1 ⁄2
1 3 ⁄3
21
1 ⁄2 7⁄8
2 1 ⁄2
11
11
11⁄32
5 3 ⁄4
4 1 ⁄4
4 3⁄4
2 1 ⁄4
1 1 ⁄8
1 7 ⁄8
1 3 ⁄8
1 3 ⁄4
13
1 1 ⁄8
1 1 ⁄8
1 1 ⁄4
1 11
⁄166
1 ⁄44
3 ⁄44
7⁄8
2 1 ⁄2
1 1 ⁄4
2 1 ⁄4
1 23
⁄321
7 ⁄81
1 ⁄83
1 ⁄41
1 ⁄41
1 ⁄4
1 1 ⁄2
2 3 ⁄8
6 3 ⁄4
5 1 ⁄4
8 3⁄4
2 3 ⁄4
1 3 ⁄8
32
13⁄32
21
1 ⁄43
1 ⁄21
3 ⁄81
3 ⁄8
23
7 1 ⁄4
5 3 ⁄4
8 3⁄4
3 1 ⁄2
1 3 ⁄8
3 5 ⁄8
3 1 ⁄3
22
1 ⁄81
1 ⁄44
1 3 ⁄8
1 3 ⁄8
2 1 ⁄2
3 1 ⁄2
86
1 ⁄28
7⁄8
4 1 ⁄2
1 5 ⁄8
4 1 ⁄4
3 17
⁄322
3 ⁄81
1 ⁄24
1 ⁄21
5 ⁄81
5 ⁄8
34
9 1 ⁄4
7 1 ⁄2
81
5 1 ⁄4
1 7 ⁄8
4 3 ⁄4
4 1 ⁄1
62
3 ⁄81
1 ⁄25
1 7 ⁄8
1 7 ⁄8
3 1 ⁄2
4 1 ⁄2
10 1 ⁄2
8 1 ⁄2
81
1 ⁄86
2 1 ⁄8
5 3 ⁄8
4 9 ⁄1
62
3 ⁄41
3 ⁄45
3 ⁄42
1 ⁄82
1 ⁄8
45
11 1 ⁄4
9 1 ⁄4
81
1 ⁄86
3 ⁄42
1 ⁄46
5 1 ⁄1
63
26
1 ⁄42
1 ⁄42
1 ⁄4
4 1 ⁄2
5 1 ⁄2
11 3 ⁄4
1012
17
1 ⁄22
3 ⁄86
5 ⁄85
9 ⁄16
3 1 ⁄4
2 1 ⁄4
72
3 ⁄82
3 ⁄8
56
5 ⁄812
3 ⁄410
3 ⁄412
1 1 ⁄8
8 1 ⁄4
2 5 ⁄8
7 3 ⁄4
6 23
⁄323
5 ⁄82
1 ⁄28
1 ⁄42
5 ⁄82
5 ⁄8
67
5 ⁄814
3 ⁄412
1 ⁄212
1 1 ⁄4
9 3 ⁄4
2 7 ⁄8
97
23⁄32
42
3 ⁄49
2 7 ⁄8
2 7 ⁄8
78
5 ⁄817
14 1 ⁄2
121
3 ⁄811
1 ⁄43
1 ⁄410
1 ⁄28
23⁄32
4 1 ⁄2
39
3 ⁄43
1 ⁄43
1 ⁄4
89
5 ⁄818
3 ⁄416
121
1 ⁄212
1 ⁄23
1 ⁄211
1 ⁄49
3 ⁄44
1 ⁄23
11 3 ⁄4
3 1 ⁄2
3 1 ⁄2
10 3 ⁄4
1210
7 ⁄8
911
3 ⁄4 D
)20
17 1 ⁄2
161
3 ⁄813
1 ⁄23
3 ⁄413
1 ⁄211
7 ⁄85
1 ⁄83
1 ⁄213
3 3 ⁄4
3 3 ⁄4
1012
3 ⁄422
19 1 ⁄4
161
1 ⁄215
4 1 ⁄4
14 3 ⁄4
12 29
⁄325
3 ⁄44
144
1 ⁄44
1 ⁄4
1114
24 1 ⁄4
2116
1 3 ⁄4
16 1 ⁄2
4 1 ⁄2
1614
5 ⁄32
5 7 ⁄8
415
4 1 ⁄2
4 1 ⁄2
1215
D)
25 3 ⁄4
22 1 ⁄2
161
3 ⁄418
4 3 ⁄4
17 3 ⁄8
15 5 ⁄3
26
3 ⁄44
3 ⁄416
1 ⁄44
3 ⁄44
3 ⁄4
1316
27 3 ⁄4
2416
219
1 ⁄25
1 ⁄818
1 ⁄216
3 ⁄16
7 1 ⁄8
517
1 ⁄45
1 ⁄85
1 ⁄8A
) (H
) Fo
r av
aila
bili
ty o
f st
eel p
ipe
size
s, r
efer
to
BS
EN 1
0216
, BS
EN 1
0217
.B
) (O
) Th
e d
iam
eter
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f th
e b
olt
ho
les
shal
l be
no
t m
ore
th
an 1 ⁄8
in la
rger
th
an t
he
bo
lts.
C)
(K)
The
dia
met
ers
tab
ula
ted
ap
ply
to
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es w
ith
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tsid
e d
iam
eter
s in
acc
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. Fo
r p
ipes
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ated
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r b
ore
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sh
all b
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.D
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) It
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hat
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is s
ize
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l pip
es s
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uld
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ided
wh
erev
er p
oss
ible
.
BS 10:2009
24 • © BSI 2009
BRITISH STANDARD BRITISH STANDARD
© BSI 2009 • 25
BS 10:2009
Figure 1 Shaped stud bolt (see C.4)
E
D
D+
Length over flanges includingwashers (where fitted) and gasket
1
2
in min.in max.
in min.
14
116
3 8
0.950.98
x core dia.
in min.116
Key
1 Screw thread
2 Radius
BS 10:2009
26 • © BSI 2009
BRITISH STANDARD
Figure 2 Application diagram for bolts and stud-bolts: carbon and flanges
0
100
300
500
1 000
900
1 500
2 000
2 500
2 800
450 500 750 900232.2 260 399 482
FC
˚ ˚
X
Y
5
3
2
4
1
a)
Key
1 Ref I in Table C.2
2 Ref II in Table C.2
3 Ref III in Table C.2
4 Ref V in Table C.2
1 Ref IV in Table C.2
X Design temperature
Y Design pressure (lbf/in2)
BRITISH STANDARD
© BSI 2009 • 27
BS 10:2009
Figure 2 Application diagram for bolts and stud-bolts: alloy steel flanges (continued)
0
500
1 000
900
1 500
2 000
2 500
2 800
450 750 900232.2 399 482
FC
˚ ˚
X
Y
2
1
3
4
975524
b)
Key
1 Ref III in Table C.2
2 Ref IV in Table C.2
3 Rev V in Table C.2
4 Ref VI in Table C.2
X Design temperature
Y Design pressure (lbf/in2)
BS 10:2009
28 • © BSI 2009
BRITISH STANDARD
Figure 3 Steel or copper alloy plain flange
F* P D
T1
16 in max*
NOTE See BS EN 13480-Parts 1-5 for weld preparations for steel flanges.
* See Clause 5.
BRITISH STANDARD
© BSI 2009 • 29
BS 10:2009
Figure 4 Steel boss flange
D P F* E B
AT
1
2
116 in max*
Key
1 Taper
2 Radius R (flange sizes 1⁄2 in to 3 1⁄2 in inclusive, 1⁄16 in max; flange sizes 4 in to 8 in inclusive, 1⁄8 in max; flange sizes 9 in to 12 in inclusive, 3⁄16 in max)
NOTE Boss flanges apply only to Tables A to Table J inclusive.
* See Clause 5.
BS 10:2009
30 • © BSI 2009
BRITISH STANDARDFi
gu
re 5
In
teg
rally
fo
rged
or
cast
ste
el fl
ang
e fo
r va
lves
on
ly
TD dia
P dia
F dia*
C dia**
X dia
1 2 3A
1 16in
max
*
not less than C + in1
4
TG
D dia
P dia
F dia*
C dia**
1
2 3
A
1 16in
max
*
X dianot less than C + in
14
a)
b
)K
ey
1 B
ack
of
flan
ge
bef
ore
bac
kfac
ing
2 1 ⁄8
in r
adiu
s m
inim
um
3 R
adiu
s R
†
NO
TE
Un
ified
hea
vy s
erie
s n
uts
are
to
o la
rge
acro
ss c
orn
ers
to b
e u
sed
wit
h t
hes
e fl
ang
es a
s th
e n
eces
sary
val
ue
of
“A”
wo
uld
res
ult
in t
he
com
ple
te r
emo
val
of
Rad
ius
R in
man
y si
zes.
* S
ee C
lau
se 5
.
** D
iam
eter
C. M
inim
um
val
ues
are
giv
en in
Tab
le R
, Tab
le S
an
d T
able
T t
o e
nsu
re a
deq
uat
e re
info
rcem
ent
of
flan
ges
.
† R
adiu
s R
, min
imu
m. A
ll Ta
ble
s: 1 ⁄4
in f
or
flan
ges
up
to
an
d in
clu
din
g 3
1 ⁄2 in
siz
e, 3 ⁄8
in a
ll o
ther
siz
es.
†† D
imen
sio
n A
is t
he
dis
tan
ce m
ach
ined
flat
fo
r n
ut
or
was
her
sea
tin
g. T
his
dis
tan
ce s
ho
uld
be
the
min
imu
m n
eces
sary
fo
r su
ch s
eati
ng
.
BRITISH STANDARD
© BSI 2009 • 31
BS 10:2009
Figure 6 Steel welding neck flange (see Table D to Table T)
T L
M
D P F* J K
1
116 in max*
Key
1 Radius R = 1⁄4 in for flanges of 1⁄2 in to 3 1⁄2 in sizes inclusive to Table D, Table E and Table F, and 3⁄8 in for all other sizes and tables.
NOTE See BS EN 13480-Parts 1-5 for weld preparation.
* See Clause 5.
BS 10:2009
32 • © BSI 2009
BRITISH STANDARD
Figure 7 Integrally cast iron flanges (see Table F and Table H)
T
D d
ia
P di
a
C di
a *
1
T
D d
ia
P di
a
C di
a *
G *
1
a) b)
Key
1 Radius R †
NOTE Applies also to Table D, flanges 78 in to 120 in.
* Diameter C and length G. Minimum values are given in Table F and Table H to ensure adequate reinforcement of the flanges. Minimum values are also given in Table D for flanges 78 in to 120 in size.
† Radius R, minimum: 1⁄2 in to 1 1⁄2 in bore inclusive R = 1⁄8 in; 2 in to 18 in bore inclusive R = 1⁄4 in; 20 in and above R = 3⁄8 in.
Provided dimension C and R are adhered to, no spot facing or back facing is necessary except for the 24 in size in Table H.
BRITISH STANDARD
© BSI 2009 • 33
BS 10:2009
Annex A (informative) Information to be supplied by the purchaserIt is recommended that, in the enquiry or order, the purchaser should specify the following.
a) The design temperature and pressure for which the flanges are required, or the Flange Table (see Clause 3).
b) Flange size designation (see Clause 4).
c) The material required (see Clause 6).
d) The type of flange if supplied loose and the preparation for attachment to pipes, if other than as specified in 7.2.
e) If the flanges are required undrilled (see 5.4).
f) If the backs of the flanges are required to be unmachined for other than a cast steel integral flange (see 5.3).
g) If a raised jointing face is required for steel flanges, Tables A to Table F inclusive (see 5.2).
h) If the flanges are to be marked to identify the material (see Clause 6).
i) If certificates are required of the process, chemical analysis and physical properties of the material (see Clause 6).
j) If a particular type of stud-bolt is required (see C.4).
k) If bolts, stud-bolts and nuts are to be marked to identify the material (see Annex C).
BS 10:2009
34 • © BSI 2009
BRITISH STANDARD
Annex B (informative) Minimum requirements of steel to be used for flanges in Table A to Table Ha) Analysis: Carbon 0.26 per cent maximum; Sulfur 0.035 per cent
maximum; Phosphorus 0.035 per cent maximum
Tensile strength: 22 tonf/in2 minimum (340 Nmm2)
Elongation: Percentage elongation on gauge length of 5 65 0. S not less than 600 divided by the tensile strength (tonf/in2) of the test piece.
b) Cast carbon steel to BS 592, Grade A, in BS EN 10293 or BS 1504-161, Grade A.
c) Forged carbon-molybdenum steel to BS 1503-240, Grade A.
d) Cast carbon-molybdenum steel to BS 1398 in BS EN 10293 or BS 1504- 240.
e) Forged chromium molybdenum steel to BS 1503-620 or BS 3604.
f) Cast chromium molybdenum steel to BS 1504-621.
g) Grey cast iron having mechanical properties at least equivalent to those set out in Table B.1 (see also Table 6).
h) Malleable cast iron to BS 309 or BS 310.
i) Copper alloys having mechanical properties at least equivalent to those specified in BS 1400-LG2-C, or BS 1400-LG3-C.
NOTE Other grades of alloy steels, cast iron and copper alloys having superior properties are available for which the temperature-pressure ratings have not yet been evaluated. Spheroidal or nodular cast iron to BS 2789 may be used at temperatures not exceeding 650 °F (343.3 °C).
Table B.1 Grey cast iron properties
Table Temperature
0°F to 250°F 0°F to 375°F up to 430°F
−17.8°C to 121.1°C −17.8°C to 190.6°C −17.8°C to 221°C
A, D and E BS EN 1561, Grade 12
BS 2035
BS EN 1561, Grade 12 BS EN 1561, Grade 14
F and H BS EN 1561, Grade 12 BS EN 1561, Grade 12 BS EN 1561, Grade 14
BRITISH STANDARD
© BSI 2009 • 35
BS 10:2009
Table B.2 Temperature/pressure ratings for grey cast iron and malleable cast iron flanges [see Clauses 5g) and 5h)]
Table Temperature °C Maximum hydraulic test pressure (lbf/in2)
−17.8 to 121.1
−17.8 to 148.9
−17.8 to 176.7
−17.8 to 190.6
−17.8 to 221.0
Temperature °F
0 to 250 0 to 300 0 to 350 0 to 375 0 to 430
Pressure (lbf/in2)
Boiler feed pipe installations etc Steam
A A) 50 B), C), D) — — — 25 E) 100
D 100 B), C) 75 — — 50 200
E 200 B), C) — 150 — 100 400
F 300 C) — — 200 190 F) 600
H 500 C) BS EN 13480-Parts 1-5 limits the use of CI feed pipes to 200 lbf/in2
190 G) 1 000
A) In sizes 27 in to 48 in inclusive, it is recommended that for cast iron valves, Table D flanges be specified instead of Table A.
B) Flanges of material as defined in BS 2035, Clause 4 should be used for these ratings only.C) These ratings do not apply to boiler feed pipe installation or other water pipes, valves and fittings subject to
shock.D) It is customary in the gas industry to limit the use of Table A flanges to working gas-pressures not exceeding
30 lbf/in2. It is recommended that this limitation be also applied to compressed air.E) This rating does not apply to flange sizes above 36 in.F) This rating applies only up to and including the 12 in flange size. Above this size reduce the pressure rating to
150 Ibf/in2.G) This is the maximum pressure allowable for cast iron at 221 °C (430 °F).
Table B.3 Temperature/pressure ratings A) for copper alloy flanges sizes 1⁄2 in to 3 in (inclusive) [see Clause 5j)]
Table Temperature °C Maximum hydraulic test pressure (lbf/in2)
−17.8 to 121.1
148.9 176.7 204.4 232.2 260.0
Temperature °F
0 to 250 300 350 400 450 500
Pressure (lbf/in2)
A B) 50 C) — — — 25 D) — 75
D B) 100 95 95 80 65 50 150
E B) 200 200 200 165 130 100 300
F 300 200 300 245 195 150 450
H 500 500 500 410 330 250 750
J 550 525 525 440 390 350 825
K 700 670 670 555 500 450 1 050
NOTE Intermediate values may be obtained by linear interpolation, except for Table A.A) The above ratings agree with those adopted in the revised edition of BS 2060 where applicable.B) The dimensions of Table A, Table D and Table E up to 3 in size are identical.C) It is customary in the gas industry to limit the use of Table A flanges to working gas pressures not exceeding
30 lbf/in2. It is recommended that this limitation be also applied to compressed air.D) This rating applies to temperatures above 121.1°C (250°F) up to and including 232.2°C (450°F).
BS 10:2009
36 • © BSI 2009
BRITISH STANDARD
Table B.4 Temperature/pressure ratings for copper alloy flanges sizes over 3 in [see Clause 5f)]
Table Temperature °C Maximum hydraulic test pressure (lbf/in2)
−17.8 to 121.1 148.9 176.7 204.4 232.2 260.0
Temperature °F
0 to 250 300 350 400 450 500
Pressure (lbf/in2)
Over 3 in to 24 in Over 3 in to 8 in
A 50 A) — — — — 25 B) — 75
D 100 — 95 90 80 65 50 150
E 175 — 165 155 135 120 100 265
F 250 — 240 220 195 175 150 375
H 400 — 380 350 320 285 250 600
J — 550 525 485 440 390 350 825
K — 700 670 615 555 500 450 1 050
NOTE Intermediate values may be obtained by linear interpolation, except for Table A.A) It is customary in the gas industry to limit the use of Table A flanges to working gas pressures not exceeding
30 lbf/in2. It is recommended that this limitation be also applied to compressed air.B) This rating applies to temperatures above 121.1°C (250°F) up to and including 232.2°C (450ºF).
BRITISH STANDARD
© BSI 2009 • 37
BS 10:2009
Annex C (normative) Bolts and nuts
C.1 ApplicationBolts, stud-bolts and nuts shall comply with the minimum requirements, corresponding to the various flange tables and temperature limits, specified in Table 2.
Table C.1 Application of bolts and stud-bolts [see Figure 2a) and Figure 2b)]
Flange tables Design temperature not exceeding
Reference for bolts or stud-bolts (see Table C.2, Column 1)
Type
A and D 232.2 °C (450 °F) I Bolt
D, E and F 260 °C (500 °F) II Bolt or stud-bolt
399 °C (750 °F) III Bolt or stud-bolt
427 °C (800 °F) V Stud-bolt
H, J and K 399 °C (750 °F) III Bolt or stud-bolt
482 °C (900 °F) V Stud-bolt
524 °C (975 °F) VI Stud-bolt
R, S and T 399 °C (750 °F) IV Bolt or stud-bolt
482 °C (900 °F) V Stud-bolt
524 °C (975 °F) VI Stud-bolt
C.2 Dimensions, finish and materials.Hexagon headed bolts with hexagon nuts or stud-bolts with hexagon nuts shall be used, the dimensions and finish of which shall comply conform to the requirements of Table 3.
NOTE 1 The materials specified in Table 3 are typical and materials to other specifications, having similar or superior properties, may be used by agreement between the purchaser and the manufacturer.
Free cutting steel shall not be used for design temperatures exceeding 232.2 °C (450 °F).
For design temperatures up to and including 260 °C (500 °F), steels for bolts, stud-bolts and nuts shall contain not more than 0.060% of sulfur or phosphorus and for design temperatures over 260 °C (500 °F) shall contain not more than 0.050% of sulfur or phosphorus.
NOTE 2 The minimum yield stresses specified for alloy steels apply to the material in the hardened and tempered condition.
Alloy steels shall have creep relaxation properties and impact properties adequate for the design temperature and shall be agreed between the purchaser and the manufacturer.
BS 10:2009
38 • © BSI 2009
BRITISH STANDARD
C.3 NutsNOTE Nuts may be made from steel to the same specification as that used for the bolts or stud-bolts to which they are fitted but, for design temperatures over 287.8 °C (550 °F), it is recommended that nuts should be made from a material having a lower tensile strength than that for the bolts, provided that it is suitable for the design temperature.
C.4 Stud-boltsStud-bolts for design temperatures not exceeding 399 °C (750 °F) shall be:
• screwed each end and plain in centre; or
• screwed full length.
For design temperatures above 399 °C (750 °F) and not exceeding 482 °C (900 °F) stud-bolts shall be:
• screwed each end and shaped in accordance with Figure 1; or
• screwed full length.
For design temperatures above 482 °C (900 °F) stud bolts shall be screwed each end and shaped in accordance with Figure 1.
C.5 WashersWashers, where used, shall be of steel and shall be:
• for bolts or stud-bolts references I, II or III (see Table 3), manufactured in accordance with BS 3410; or
• for bolts or stud-bolts references IV, V or VI (see Table 3), manufactured in accordance with BS 3410, Part 1, except that for design temperatures above 482 °C (900 °F) the steel shall be to BS EN 10090 En 2E, 3A or 4, unless otherwise agreed between purchaser and manufacturer.
Washers shall not be fitted where the partial removal of the radius or fillet at the back of the flange by spot-facing or back-facing would result in the removal of the radius or fillet to an extent greater than that indicated in Figure 5 for integrally cast or forged steel flanges.
NOTE 1 The use of washers may necessitate the partial removal of the radius or fillet at the back of the flange by spot-facing or back-facing.
NOTE 2 For references III to VI inclusive (see Table 3) it is desirable to mark the nuts, bolts and stud-bolts to identify the materials used. When the purchaser requires this to be done, the system of marking to be employed should be the subject of agreement between the purchaser and the manufacturer.
BRITISH STANDARD
© BSI 2009 • 39
BS 10:2009
Table C.2 Materials, dimensions and finish of bolts, stud-bolts and nuts
Ref. Materials Typical material specifications Screw threads (BS 84 or BS 1580-1)
Specifications for dimensions (except screw threads) and finish
Bolts and stud-bolts
Nuts Bolts and nuts, and nuts of stud-bolts
Stud-bolts
I Carbon steel
BS 916 or BS 1769Min. tensile strength 26 tonf/in2
BS 916 or BS 1769 Min. tensile strength 26 tonf/in2
BSW or UNC
BS 916 or BS 1769 (all black all over)
—
II Carbon steel
BS 916 or BS 1769Min. tensile strength 28 tonf/in2
Not more than 0.060% sulfur or phosphorus
BS 916 or BS 1769Min. tensile strength 28 tonf/in2
Not more than 0.060% sulfur or phosphorus
BSW or UNC
BS 916 or BS 1769 (all black all over)
Shaped as Figure 1 or screwed full length or screwed each end and plain in centre
III Carbon steel
Tensile strength 35/40 tonf/in2
Min. yield stress 18 tonf/in2
Min. elongation 20% on 2 in gauge length
For design temperatures not exceeding 260°C (500°F) not more than 0.060% sulfur or phosphorus.For design temperatures over 260°C (500°F) not more than 0.050% sulfur or phosphorus.
Tensile strength 32/38 tonf/ in2
Min. yield stress 16 tonf/in2
Min. elongation 20% on 2 in gauge lengthAlternatively, Tensile strength 35/40 tonf/in2
Min. yield stress 18 tonf/in2
Min. elongation 20% on 2 in gauge length
In each case, for design temperature not exceeding 260 °C (500 °F) not more than 0.060% sulfur or phosphorus. For design temperatures over 260 °C (500 °F) not more than 0.050% sulfur or phosphorus
BSW or BSF or UNC or 8 UN (sizes over 1 in)
BS 916 or BS 1769 (all black all over)
Shaped as Figure 1 or screwed full length or screwed each end and plain in centre
BS 10:2009
40 • © BSI 2009
BRITISH STANDARD
Table C.2 Materials, dimensions and finish of bolts, stud-bolts and nuts (continued)
Ref. Materials Typical material specifications Screw threads (BS 84 or BS 1580-1)
Specifications for dimensions (except screw threads) and finish)
Bolts and stud-bolts
Nuts Bolts and nuts, and nuts of stud-bolts
Stud-bolts
IV Carbon steel
BS 1083, Grade R; or BS 1768, Grade S. Not more than 0.050% sulfur or phosphorus.
Tensile strength 35/40 tonf/in2
Min. yield stress 18 tonf/in2
Min. elongation 20% on 2 in gauge lengthAlternatively,Tensile strength 45/55 tonf/in2
Min. yield stress 23 tonf/in2
Min. elongation 20% on 2 in gauge lengthIn each case, not more than 0.050% sulfur or phosphorus.
BSW or BSF or UNC or 8 UN (sizes over 1 in)
BS 916 or BS 1769 (all with heads and nuts machined on bearing face).Alternatively,BS 1083BS 1768
Shaped as Figure 1 or screwed full length or screwed each end and plain in centre
V Alloy steel
BS EN 10090 En 20B(T), hardened and tempered. Min. yield stress 44 tonf/in2
Carbon-molybdenum to BS 1506-240Alternatively,BS EN 10090 En 20B(T) hardened and tempered.Alternatively, for design temperatures not exceeding 454 °C (850 °F) carbon steel.Tensile strength 35/40 tonf/in2
Min. yield stress 18 tonf/in2
Min. elongation 20% on 2 in gauge lengthNot more than 0.050% sulfur or phosphorus.
BSF or UNC (sizes 1 in and below)8 UN (sizes over 1 in)
(Nuts only) BS 916 or BS 1769 (all machined on bearing face)Alternatively,BS 1083 orBS 1768
Shaped as Figure 1 except as stated in C.4
VI Alloy steel
Chromium molybdenum or chromium molybdenum vanadium steel with creep relaxation and impact properties adequate for the design temperature which shall be agreed between the purchaser and the manufacturer.For design temperatures not exceeding 510 °C (950 °F), carbon-molybdenum nuts to BS 1506-240 may be used.
BSF or UNC (sizes 1 in and below)8 UN (sizes over 1 in)
(Nuts only) BS 916 or BS 1769 (all machined on bearing face)Alternatively,BS 1083 orBS 1768
Shaped as Figure 1 except as stated in C.4
NOTE For sizes above 1 in (Ref. III, V and VI), 8 UN threads to BS 1580 are specified.
BRITISH STANDARD
© BSI 2009 • 41
BS 10:2009
BibliographyFor dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
BS 309, Particleboards – Definition and classification
BS 310, Wood-based panels – Determination of modulus of elasticity in bending and of bending strength
BS 350, Conversion factors for units
BS 1083, Specification for precision hexagon bolts, screws and nuts (B.S.W. & B.S.F. threads)
BS 1400, Specification for copper alloy ingots and copper alloy and high conductivity copper castings
BS 1503, Specification for steel forgings for pressure purposes
BS 1504, Specification for steel castings for pressure purposes
BS 1768, Specification for Unified precision hexagon bolts, screws, & nuts (UNC & UNF threads) – Normal series
BS 2035, Specification for cast iron flanged pipes and flanged fittings
BS 2789, Specification for spheroidal graphite or nodular graphite cast iron
BS 2856, Precise conversion of inch and metric sizes on engineering drawings
BS 3603, Specification for carbon and alloy steel pipes and tubes with specified low temperature properties for pressure purposes
BS 3604 (all parts), Steel pipes and tubes for pressure purposes: ferritic alloy steel with specified elevated temperature properties
BS 4622, Specification for grey iron pipes and fittings
BS EN 1561, Founding – Grey cast irons
BS EN 1591-1, Flanges and their joints – Design rules for gasketed circular flange connections – Part 1: Calculation method
BS EN 10216 (all parts), Seamless steel tubes for pressure purposes – Technical delivery conditions
BS EN 10217 (all parts), Welded steel tubes for pressure purposes – Technical delivery conditions
BS EN 10293, Steel castings for general engineering uses
BS EN 12449, Copper and copper alloys – Seamless, round tubes for general purposes
BS 10:2009 BRITISH STANDARD
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