Post on 09-Mar-2018
7-1
Socket Weld and Threaded Fittings
Aalco Tel. 01932 250100 Fax: 01932 250101 E-mail: Marketing@amari-metals.com
Section 7
Socket Weld and Threaded Fittings
This Section contains dimension and tolerance informationextracted from American and British specifications applicableto socket weld and threaded fittings.
Subsections and topics PageHigh Pressure Fittings - General 7-2Pressure/Temperature Ratings - BS 3799 7-4Socket Weld Fittings - ANSI/ASME B16.11/BS 3799 7-6Threaded Fittings - ANSI/ASME B16.11/BS 3799 7-11Plugs and Bushings - ANSI B16.11/BS 3799 7-13Hexagonal and Round Nipples - BS 3799 7-14Welding Bosses - BS 3799 7-15Threaded Unions - BS 3799 7-16Swage Nipples - BS 3799 7-18
Outlets 7-19 to 7-25
Low Pressure Threaded Fittings - General 7-26Equal Elbows, Tees and Crosses - BS 1740 7-27 Sockets - BS 1740 7-31Caps and Plugs - BS 1740 7-33Hexagonal Bushes and Nipples - BS 1740 7-34
ASME/ANSI and BS Specifications covered in this Section Page
ANSI/ASME B16.11-1991 - Forged Fittings, Socket-welding and Threaded 7-2
BS 3799:1974 - Steel Pipe Fittings, Screwed and Socket-welding for the Petroleum Industry 7-2
BS 1740:Part 1:1971 Wrought Steel Pipe Fittings (screwed BSP thread) 7-26
7-2
Socket Weld and Threaded Fittings
Aalco Tel. 01932 250100 Fax: 01932 250101 E-mail: Marketing@amari-metals.com
High Pressure Fittings - GeneralThis subsection summarises requirements for high pressure (HP) socket weld andthreaded fittings as defined in ASME/ANSI B16.11-1991 and BS 3799:1974. Dimensionsare reproduced in pages 7-6 to 7-25, including coverage of Outlet fittings that are alsoused in high pressure applications.
SpecificationsThe specifications applicable to high pressure socket weld and threaded fittings are as follows:
❍ ASME/ANSI B16.11-1991 - Forged fittings,socket-welding and threaded.
❍ BS 3799:1974 - Steel pipe fittings, screwed andsocket-welding for the petroleum industry. Thisspecification is substantially the same as B16.11.
A summary of the fittings, sizes and pressureratings (class designations) covered by B16.11and BS 3799 is provided in the tables below. Thefirst table also shows the pipe weights defined ascompatible with the various classes of fitting.
Class designations in B16.11-1991 and BS 3799:1974
Notes1 Class designations correspond to the maximum cold working pressure of fittings in pounds force per square inch.2 The wall thicknesses quoted are not restrictive but do correlate for calculation of pressure ratings. Thicker or thinner pipe
may be used, but when thinner pipe is used its strength should govern the pressure rating.3 Bore dimensions for Class 3000 lb socket welding fittings correspond to Schedule 40 pipe.4 Bore dimensions for Class 6000 lb socket welding fittings correspond to Schedule 160 pipe.
Summary of coverage provided by B16.11-1991 and BS 3799:1974
Notes1 Plugs and bushes are not designated by Class and may be used for ratings up to Class 6000 lb.2 Swage nipples may be ordered in any combination of end preparation.
Class Designation1
(lb)
Pipe defined as normally used with the fittings2
B16.11-1991 BS 3799:1974Socket Weld Threaded Socket Weld Threaded
2000 - Schedule 80/XS - -30003 Schedule 80/XS Schedule 160 Schedule 803 Schedule 806000 Schedule 160 XXS Schedule 1604 XXS9000 XXS - - -
Types of fittings
B16.11-1991 BS 3799:1974Socket Weld Threaded Socket Weld Threaded
3000
lb
6000
lb
9000
lb
2000
lb
3000
lb
6000
lb
3000
lb
6000
lb
3000
lb
6000
lb
Elbows, 90° and 45° ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔
Crosses ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔
Tees ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔
Couplings and half couplings ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔
Caps ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔
Square, hexagonal and round plugs1 ✔ ✔
Hexagonal head bushings1 ✔ ✔
Flush bushings1 ✔
Hexagonal and round nipples ✔ ✔
Unions ✔ ✔
Welding bosses ✔ ✔ ✔ ✔
Swage nipples2 ✔ ✔ ✔ ✔
Socket Weld and Threaded Fittings
7-3Aalco Tel. 01932 250100 Fax: 01932 250101 E-mail: Marketing@amari-metals.com
High Pressure Fittings - General
Dimensions and Tolerances❍ Dimensions. See pages 7-6 to 7-25 for HP fitting
dimensions.❍ Size Designations for Reducing Fittings.
❍ Tolerances specified in ASME/ANSI B16.11 areincluded in the dimension tables. BS 3799tolerances are substantially the same. Additionaltolerances are as follows:
Manufacture❍ ASME/ANSI B16.11-1991. ASME/ANSI stainless
steel socket weld or threaded fittings are mostcommonly manufactured from materialconforming to ASTM A182 (see page 4-6).
❍ BS 3799:1974. Manufacturing requirements aresubstantially the same as for B16.11. Stainlesssteel grades specified are as indicated in thepressure/temperature ratings table on page 7-4.
❍ Marking should include (in priority order): - Manufacturers name or trademark - Material identification (in accordance with A 182, - Class or pressure ratings (e.g. 3000 lb) - Size Markings may be omitted (least priority first fromabove list) if fitting size or shape imposes limits.
❍ Outlets. Socket weld and threaded outletscomply with B16.11 requirements, althoughB16.11 does not specifically cover outlets.
Pressure Ratings❍ General. The Class designation (e.g. 3000 lb) of
the high pressure fittings indicates the maximumcold working pressure.
❍ ASME/ANSI B16.11 Fittings. ASME/ANSIB16.11 specifies the allowable pressure/temperature rating to be that of seamless pipe ofthe equivalent material and wall thickness.
❍ BS 3799 Fittings. BS 3799 includes a table ofpressure/temperature rating. This is reproducedon page 7-4.
❍ Outlets. These fittings conform to the pressurerequirements of ASME/ANSI B16.11.
1
3
21
2
3
41 x 2 x 3where 1 is the largest nominal size
1 x 2 x 3 x 4where 1 and 3 are the larger nominal sizes
Fitting bore and socket bore tolerancesNPS Tolerance
Concentricity of bores All ±0.8 mm
Alignment of axes All0.06 in
per 1 ft, or 1 in 200
7-4
Socket Weld and Threaded Fittings
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co T
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arke
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Pres
sure
/Tem
pera
ture
Rat
ings
- BS
379
9Th
is s
ubse
ctio
n co
vers
the
pres
sure
ratin
gs fo
r hig
h pr
essu
re s
tain
less
ste
el s
ocke
t wel
d an
d th
read
ed fi
tting
s co
vere
d in
BS
3799
. Se
e pa
ge 7
-3 fo
r AN
SI/A
SME
B16.
11 p
ress
ure
ratin
g re
quire
men
ts.
Pres
sure
/tem
pera
ture
ratin
gs fr
om B
S 37
99:1
974
Tem
p
Sta
inle
ss S
teel
Gra
des
and
Cla
sses
(lb)
WP
304
WP3
04H
WP
304L
W
P321
WP
321H
WP3
47W
P34
7HW
P316
WP3
16H
WP3
16L
WP
317
WP3
09W
P310
3000 lb
6000 lb
3000 lb
6000 lb
3000 lb
6000 lb
3000 lb
6000 lb
3000 lb
6000 lb
3000 lb
6000 lb
3000 lb
6000 lb
3000 lb
6000 lb
3000 lb
6000 lb
3000 lb
6000 lb
3000 lb
6000 lb
3000 lb
6000 lb
3000 lb
6000 lb
°CPr
essu
re R
atin
g, m
ax, B
ar-1
00/-5
017
735
4-
-14
729
520
741
4-
-20
741
4-
-20
741
4-
-14
729
520
741
420
741
420
741
4-5
0/-3
017
735
4-
-14
729
520
741
4-
-20
741
4-
-20
741
4-
-14
729
520
741
420
741
420
741
4-3
0/+4
017
735
417
734
514
729
520
741
420
741
420
741
420
741
420
741
420
741
414
729
520
741
420
741
420
741
450
172
345
172
345
147
294
206
411
206
411
206
411
206
411
206
411
206
411
147
295
206
411
206
411
206
411
7516
533
016
533
014
629
220
340
620
340
620
340
620
340
620
340
620
340
614
729
520
340
620
340
620
340
610
015
531
115
531
114
228
520
040
120
040
120
040
120
040
120
040
120
040
114
729
420
040
120
040
120
040
112
514
829
714
829
713
326
619
839
619
839
619
839
619
839
619
839
619
839
614
228
419
839
619
839
619
839
615
014
228
414
228
412
324
719
639
219
639
219
639
219
639
219
639
219
639
213
727
419
639
219
639
219
639
217
513
627
213
627
211
422
919
438
819
438
819
438
819
438
819
438
819
438
812
625
219
438
819
438
819
438
820
013
026
013
026
010
521
119
238
419
238
419
238
419
238
419
238
419
238
411
523
019
238
419
238
419
238
422
512
525
012
525
099
.519
918
837
718
837
718
837
718
837
718
837
718
837
711
022
018
837
718
837
718
837
725
012
024
012
024
094
188
183
366
183
366
183
366
183
366
183
366
183
366
106
212
183
366
183
366
183
366
275
116
231
115
231
9018
017
434
917
434
917
434
917
434
917
434
917
434
910
220
417
434
917
434
917
434
930
011
222
411
222
487
.517
516
533
116
533
116
533
116
533
116
533
116
533
198
.519
716
533
116
533
116
533
132
510
821
710
821
785
170
155
311
155
311
155
311
155
311
155
311
155
311
9519
015
531
115
531
115
531
135
010
521
010
521
082
.516
514
729
414
729
414
729
414
729
414
729
414
729
492
184
147
294
146
293
146
293
375
101
203
101
203
80.5
161
141
282
141
282
141
282
141
282
141
282
141
282
8917
814
128
214
028
014
028
040
098
196
9819
678
.515
713
527
013
527
013
527
013
527
013
527
013
527
086
172
135
270
133
267
133
267
425
9519
095
190
76.5
153
129
258
129
258
129
258
129
258
129
258
129
258
83.5
167
129
258
127
254
127
254
450
9218
492
184
--
123
246
123
246
123
246
123
246
123
246
123
246
8116
212
324
612
024
012
024
047
589
.517
989
.517
9-
-11
723
411
723
411
723
411
723
411
723
411
723
4-
-11
723
411
322
711
322
750
088
176
8817
6-
-11
122
311
122
311
122
311
122
311
122
311
122
3-
-11
122
310
721
410
721
452
587
174
8717
4-
-10
521
110
521
110
521
110
521
110
521
110
521
1-
-10
521
198
196
100
201
Socket Weld and Threaded Fittings
7-5
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co T
el. 0
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100
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arke
ting@
amar
i-met
als.
com
Not
es-
The
pres
sure
ratin
gs a
ssum
e st
ainl
ess
stee
l for
ging
mat
eria
l man
ufac
ture
d as
follo
ws
(AST
M A
182
equ
ival
ents
are
app
roxi
mat
e):
WP3
04 =
BS
1503
304
S40
= A
182
F304
WP3
04L
= BS
150
3 30
4S30
= A
182
F30
4LW
P321
= B
S 15
03 3
21S4
0 =
A 18
2 F3
21W
P316
= B
S 15
03 3
16S4
0 or
S41
= A
182
F31
6W
P316
L =
BS 1
503
316S
30 o
r S31
= A
182
F31
6L-
The
pres
sure
ratin
gs a
ssum
e st
ainl
ess
stee
l pip
e m
anuf
actu
red
as fo
llow
s (A
STM
A 3
12 e
quiv
alen
ts a
re a
ppro
xim
ate)
:W
P304
= B
S 36
05 3
04S1
8 =
A 31
2 TP
304
WP3
04L
= BS
360
5 30
4S14
= A
312
TP3
04L
WP3
21 =
BS
3605
321
S18
= A
312
TP32
1W
P316
= B
S 36
05 3
16S1
8 =
A 31
2 TP
316
WP3
16L
= BS
360
5 31
6S14
= A
312
TP3
16L
550
85.5
171
85.5
171
--
99.5
199
99.5
199
99.5
199
99.5
199
99.5
199
99.5
199
--
99.5
199
85.5
171
93.5
187
575
80.5
161
80.5
161
--
9418
894
188
9418
894
188
9418
894
188
--
9418
873
146
87.5
175
600
69.5
139
69.5
139
--
8817
688
176
8817
688
176
8917
889
178
--
8917
860
120
80.5
161
625
5511
055
110
--
7114
271
142
7114
271
142
7915
879
158
--
7915
847
.595
69.5
139
650
43.8
87.7
43.8
87.7
--
48.7
97.4
48.7
97.4
48.7
97.4
48.7
97.4
66.5
133
66.5
133
--
66.5
133
3774
58.5
117
675
32.9
65.8
32.9
65.8
--
33.8
67.6
33.8
67.6
33.8
67.6
33.8
67.6
5310
653
106
--
5310
628
.957
.847
.695
.270
025
.250
.525
.250
.5-
-23
.346
.623
.346
.623
.346
.623
.346
.641
.382
.741
.382
.7-
-41
.382
.723
.747
.536
.372
.672
519
.338
.719
.338
.7-
-16
.633
.216
.633
.216
.633
.216
.633
.229
.859
.629
.859
.6-
-29
.859
.618
.937
.926
5275
015
.130
.215
.130
.2-
-12
.825
.712
.825
.712
.825
.712
.825
.722
44.1
2244
.1-
-22
44.1
14.5
2918
.336
.777
511
.723
.511
.723
.5-
-10
.220
.510
.220
.510
.220
.510
.220
.517
3417
34-
-17
3411
.222
.413
.126
.280
08.
717
.58.
717
.5-
-8.
216
.48.
216
.48.
216
.48.
216
.412
.525
.112
.525
.1-
-12
.525
.19.
318
.69.
318
.6
Pres
sure
/tem
pera
ture
ratin
gs fr
om B
S 37
99:1
974
(Con
tinue
d)
Tem
p
Sta
inle
ss S
teel
Gra
des
and
Cla
sses
(lb)
WP
304
WP3
04H
WP
304L
W
P321
WP
321H
WP3
47W
P34
7HW
P316
WP3
16H
WP3
16L
WP
317
WP3
09W
P310
3000 lb
6000 lb
3000 lb
6000 lb
3000 lb
6000 lb
3000 lb
6000 lb
3000 lb
6000 lb
3000 lb
6000 lb
3000 lb
6000 lb
3000 lb
6000 lb
3000 lb
6000 lb
3000 lb
6000 lb
3000 lb
6000 lb
3000 lb
6000 lb
3000 lb
6000 lb
°CPr
essu
re R
atin
g, m
ax, B
ar
Pres
sure
/Tem
pera
ture
Rat
ings
- BS
379
9
7-6
Socket Weld and Threaded Fittings
Aalco Tel. 01932 250100 Fax: 01932 250101 E-mail: Marketing@amari-metals.com
3000 lb Socket Weld Fittings - ANSI B16.11/BS 3799
Notes- Average socket wall thickness C around periphery shall not be less than the listed values. Minimum values are permitted
in localised areas.- Dimensions B and J are the same for Class 3000, 6000 and 9000 lb fittings.- Dimensions and tolerances shown are as specified in ASME/ANSI B16.11-1991. These agree substantially with BS
3799:1974. Exceptions are indicated in the following note.- BS 3799 does not cover NPS 4.
Dimensions and tolerances (based on ASME/ANSI B16.11-1991 and BS 3799:1974)
NPS
max
/ave
/min
Centre to Bottom ofSocket Socket
BoreDiameter
Bore Diameter of Fittings
Socket Wall
ThicknessBody Wall
Depth of
Socket90° Elbows,
Tees, &Crosses
45°Elbows
� � � � � � �
in mm in mm in mm in mm in mm in mm in mm
1/8max +0.03 12 +0.03 9 0.440 11.15 0.299 7.6 - - - - - -ave 0.44 - 0.31 - - - - - 0.125 3.20 - - - -min -0.03 10 -0.03 7 0.420 10.65 0.239 6.1 0.125 3.20 0.095 2.40 0.38 10
1/4max +0.03 12 +0.03 9 0.575 14.60 0.394 10.0 - - - - - -ave 0.44 - 0.31 - - - - - 0.149 3.80 - - - -min -0.03 10 -0.03 7 0.555 14.10 0.334 8.5 0.130 3.30 0.119 3.00 0.38 10
3/8max +0.06 15 +0.06 9 0.710 18.05 0.523 13.3 - - - - - -ave 0.53 0.31 - - - - - 0.158 4.00 - - - -min -0.06 12 -0.06 6 0.690 17.55 0.463 11.8 0.138 3.50 0.126 3.20 0.38 10
1/2max +0.06 17 +0.06 13 0.875 22.20 0.652 16.6 - - - - - -ave 0.62 0.44 - - - - - 0.184 4.65 - - - -min -0.06 14 -0.06 10 0.855 21.70 0.592 15.0 0.161 4.10 0.147 3.75 0.38 10
3/4max +0.06 21 +0.06 14 1.085 27.55 0.854 21.7 - - - - - -ave 0.75 - 0.50 - - - - - 0.193 4.90 - - - -min -0.06 18 -0.06 11 1.065 27.05 0.794 20.2 0.168 4.25 0.154 3.90 0.50 13
1max +0.08 24 +0.08 16 1.350 34.30 1.079 27.4 - - - - - -ave 0.88 - 0.56 - - - - - 0.224 5.70 - - - -min -0.08 20 -0.08 12 1.330 33.80 1.019 25.9 0.196 5.00 0.179 4.55 0.50 13
11/4max +0.08 29 +0.08 19 1.695 43.05 1.410 35.8 - - - - - -ave 1.06 - 0.69 - - - - - 0.239 6.05 - - - -min -0.08 25 -0.08 15 1.675 42.55 1.350 34.3 0.208 5.30 0.191 4.85 0.50 13
11/2max +0.08 34 +0.08 23 1.935 49.15 1.640 41.7 - - - - - -ave 1.25 - 0.81 - - - - - 0.250 6.35min -0.08 30 -0.08 19 1.915 48.65 1.580 40.1 0.218 5.55 0.200 5.10 0.50 13
2max +0.08 40 +0.08 27 2.426 61.60 2.097 53.5 - - - - - -ave 1.50 - 1.00 - - - - - 0.273 6.95 - - - -min -0.08 36 -0.08 23 2.406 61.10 2.037 51.7 0.238 6.05 0.218 5.55 0.62 16
21/2max +0.10 44 +0.10 31 2.931 74.45 2.529 64.2 - - - - - -ave 1.62 - 1.12 - - - - - 0.345 8.75 - - - -min -0.10 39 -0.10 27 2.906 73.80 2.409 61.2 0.302 7.65 0.276 7.00 0.62 16
3max +0.10 60 +0.10 34 3.560 90.40 3.128 79.5 - - - - - -ave 2.25 - 1.25 - - - - - 0.375 9.50 - - - -min -0.10 55 -0.10 29 3.535 89.30 3.008 46.4 0.327 8.30 0.300 7.60 0.62 16
4max +0.10 69 +0.10 44 4.570 116.05 4.086 103.8 - - - - - -ave 2.62 - 1.62 - - - - - 0.421 10.70 - - - -min -0.10 64 -0.10 39 4.545 115.45 3.966 100.7 0.368 9.35 0.337 8.55 0.75 19
Socket Weld and Threaded Fittings
7-7Aalco Tel. 01932 250100 Fax: 01932 250101 E-mail: Marketing@amari-metals.com
3000 lb Socket Weld Fittings -ANSI B16.11/BS 3799
Notes- Average socket wall thickness C around periphery shall not be less than the listed values. Minimum values are permitted
in localised areas.- Dimensions B, J, E and F are the same for Class 3000, 6000 and 9000 lb fittings.- Dimensions and tolerances shown are as specified in ASME/ANSI B16.11-1991. These agree substantially with
BS 3799:1974. Exceptions are indicated in the following notes.- BS 3799 does not cover NPS 4.1 These values for K are BS 3799 minimum values, quoted because they differ from the ASME/ANSI B16.11 values.
Dimensions and tolerances (based on ASME/ANSI B16.11-1991 and BS 3799:1974)
NPS
max
/ave
/min Socket
BoreDiameter
Bore Diameter of Fittings
Socket Wall
Thickness
Depthof
Socket
Laying Lengths Cap End Wall
ThicknessCouplings HalfCouplings
� � � � �� �
in mm in mm in mm in mm in mm in mm in mm
1/8max 0.440 11.15 0.299 7.6 - - - - +0.06 8 +0.03 17 - -ave - - - - 0.125 3.20 - - 0.25 - 0.62 - - 41
min 0.420 10.65 0.239 6.1 0.125 3.20 0.38 10 -0.06 5 -0.03 15 0.19 5.0
1/4max 0.575 14.60 0.394 10.0 - - - - +0.06 8 +0.03 17 - -ave - - - - 0.149 3.80 - - 0.25 - 0.62 - - 71
min 0.555 14.10 0.334 8.5 0.130 3.30 0.38 10 -0.06 5 -0.03 15 0.19 5.0
3/8max 0.710 18.05 0.523 13.3 - - - - +0.12 9 +0.06 19 - -ave - - - - 0.158 4.00 - - 0.25 - 0.69 - - 71
min 0.690 17.55 0.463 11.8 0.138 3.50 0.38 10 -0.12 3 -0.06 16 0.19 5.0
1/2max 0.875 22.20 0.652 16.6 - - - - +0.12 13 +0.06 24 - -ave - - - - 0.184 4.65 - - 0.38 - 0.88 - - 81
min 0.855 21.70 0.592 15.0 0.161 4.10 0.38 10 -0.12 6 -0.06 21 0.25 6.5
3/4max 1.085 27.55 0.854 21.7 - - - - +0.12 13 +0.06 25 - -ave - - - - 0.193 4.90 - - 0.38 - 0.94 - - 101
min 1.065 27.05 0.794 20.2 0.168 4.25 0.50 13 -0.12 6 -0.06 22 0.25 6.5
1max 1.350 34.30 1.079 27.4 - - - - +0.16 17 +0.08 31 - -ave - - - - 0.224 5.70 - - 0.50 - 1.12 - - 111
min 1.330 33.80 1.019 25.9 0.196 5.00 0.50 13 -0.16 9 -0.08 27 0.38 9.5
11/4max 1.695 43.05 1.410 35.8 - - - - +0.16 17 +0.08 32 - -ave - - - - 0.239 6.05 - - 0.50 - 1.19 - - 131
min 1.675 42.55 1.350 34.3 0.208 5.30 0.50 13 -0.16 9 -0.08 28 0.38 9.5
11/2max 1.935 49.15 1.640 41.7 - - - - +0.16 17 +0.08 34 - -ave - - - - 0.250 6.35 - - 0.50 - 1.25 - - 141
min 1.915 48.65 1.580 40.1 0.218 5.55 0.50 13 -0.16 9 -0.08 30 0.44 11.0
2max 2.426 61.60 2.097 53.5 - - +0.16 23 +0.08 43 - -ave - - - - 0.273 6.95 - - 0.75 - 1.62 - - 181
min 2.406 61.10 2.037 51.7 0.238 6.05 0.62 16 -0.16 15 -0.08 39 0.50 12.5
21/2max 2.931 74.45 2.529 64.2 - - +0.20 24 +0.10 45 - -ave - - - - 0.345 8.75 - - 0.75 - 1.69 - - 211
min 2.906 73.80 2.409 61.2 0.302 7.65 0.62 16 -0.20 14 -0.10 40 0.62 16.0
3max 3.560 90.40 3.128 79.5 - - - - +0.20 24 +0.10 47 - -ave - - - - 0.375 9.50 - - 0.75 - 1.75 - - 241
min 3.535 89.30 3.008 46.4 0.327 8.30 0.62 16 -0.20 14 -0.10 42 0.75 19.0
4max 4.570 116.05 4.086 103.8 - - - - +0.20 24 +0.10 50 - -ave - - - - 0.421 10.70 - - 0.75 - 1.88 - - -min 4.545 115.45 3.966 100.7 0.368 9.35 0.75 19 -0.20 14 -0.10 45 0.88 22.0
7-8
Socket Weld and Threaded Fittings
Aalco Tel. 01932 250100 Fax: 01932 250101 E-mail: Marketing@amari-metals.com
6000 lb Socket Weld Fittings - ANSI B16.11/BS 3799
Notes- Average socket wall thickness C around periphery shall not be less than the listed values. Minimum values are permitted
in localised areas.- Dimensions B and J are the same for Class 3000, 6000 and 9000 lb fittings.- Dimensions and tolerances shown are as specified in ASME/ANSI B16.11-1991. These agree substantially with
BS 3799:1974. Exceptions are indicated in the following notes.- BS 3799 does not cover NPS 1/8, 1/4, 3/8 or 4. BS 3799 dimensions and tolerances are shown in italics.1 BS 3799 covers elbows, tees and crosses at NPS 21/2 and 3 (not covered by ASME/ANSI B16.11).
Dimensions and tolerances (based on ASME/ANSI B16.11-1991 and BS 3799:1974)
NPS
max
/ave
/min
Centre to Bottom ofSocket Socket
BoreDiameter
Bore Diameter of Fittings
Socket Wall
ThicknessBody Wall
Depth of
Socket90° Elbows,
Tees, &Crosses
45°Elbows
� � � � � � �
in mm in mm in mm in mm in mm in mm in mm
1/8max +0.03 12 +0.03 9 0.440 11.15 0.189 4.8 - - - - - -ave 0.44 - 0.31 - - - - - 0.156 3.95 - - - -min -0.03 10 -0.03 7 0.420 10.65 0.126 3.2 0.135 3.45 0.124 3.15 0.38 10
1/4max +0.03 17 +0.03 9 0.575 14.60 0.280 7.1 - - - - - -ave 0.53 - 0.31 - - - - - 0.181 4.60 - - - -min -0.03 13 -0.03 7 0.555 14.10 0.220 5.6 0.158 4.00 0.145 3.70 0.38 10
3/8max +0.06 17 +0.06 13 0.710 18.05 0.389 9.9 - - - - - -ave 0.62 - 0.44 - - - - - 0.198 5.05 - - - -min -0.06 14 -0.06 10 0.690 17.55 0.329 8.4 0.172 4.35 0.158 4.00 0.38 10
1/2max +0.06 21 +0.06 14 0.875 22.20 0.494 12.5 - - - - - -ave 0.75 - 0.50 - - - - - 0.235 5.95 - - - -min -0.06 18 -0.06 11 0.855 21.70 0.434 11.0 0.204 5.20 0.188 4.80 0.38 10
3/4max +0.06 24 +0.06 16 1.085 27.55 0.642 16.3 - - - - - -ave 0.88 - 0.56 - - - - - 0.274 6.95 - - - -min -0.06 21 -0.06 13 1.065 27.05 0.582 14.8 0.238 6.05 0.219 5.55 0.50 13
1max +0.08 29 +0.08 19 1.350 34.30 0.845 21.5 - - - - - -ave 1.06 - 0.69 - - - - - 0.312 7.90 - - - -min -0.08 25 -0.08 15 1.330 33.80 0.785 19.9 0.273 6.95 0.250 6.35 0.50 13
11/4max +0.08 34 +0.08 23 1.695 43.05 1.190 30.2 - - - - - -ave 1.25 - 0.81 - - - - - 0.312 7.90 - - - -min -0.08 30 -0.08 19 1.675 42.55 1.130 28.7 0.273 6.95 0.250 6.35 0.50 13
11/2max +0.08 40 +0.08 27 1.935 49.15 1.368 34.7 - - - - - -ave 1.50 - 1.00 - - - 0.315 8.90 - - - -min -0.08 36 -0.08 23 1.915 48.65 1.308 33.2 0.307 7.80 0.281 7.15 0.50 13
2max +0.08 43 +0.08 31 2.426 61.60 1.717 43.6 - - - - - -ave 1.62 - 1.12 - - - - - 0.430 10.90 - - - -min -0.08 39 -0.08 27 2.406 61.10 1.657 42.1 0.374 9.50 0.344 8.75 0.62 16
21/2max - +2.5 - +2.5 2.931 74.45 - +0.8 - +0.4 - - - -ave - 571 - 321 - 54.01 - 7.71 - - - -min - -2.5 - -2.5 2.906 73.80 - -0.8 -0.0 0.276 7.00 0.62 16
3max - +2.5 - +2.5 3560 90.40 - +0.8 +0.4 - - - -ave - 641 - 411 - 67.01 - 8.31 - - - -min - -2.5 - -2.5 3.535 89.30 - -0.8 - -0.0 0.300 7.60 0.62 16
Socket Weld and Threaded Fittings
7-9Aalco Tel. 01932 250100 Fax: 01932 250101 E-mail: Marketing@amari-metals.com
6000 lb Socket Weld Fittings -ANSI B16.11/BS 3799
Notes- Average socket wall thickness C around periphery shall not be less than the listed values. Minimum values are permitted
in localised areas. (Dimension C is not specified in ASME/ANSI B16.11 for Class 6000 lb Caps larger than NPS 2.)- Dimensions B, J, E and F are the same for Class 3000, 6000 and 9000 lb fittings.- Dimensions and tolerances shown are as specified in ASME/ANSI B16.11-1991. These agree substantially with
BS 3799:1974. Exceptions are indicated in the following notes.- BS 3799 does not cover NPS 1/8, 1/4, 3/8 or 4. BS 3799 dimensions and tolerances are shown in italics.1 These values for K are BS 3799 minimum values, quoted because they differ from the ASME/ANSI B16.11 values.
Dimensions and tolerances (based on ASME/ANSI B16.11-1991 and BS 3799:1974)
NPS
max
/ave
/min Socket
BoreDiameter
Bore Diameter of Fittings
Socket Wall
Thickness
Depthof
Socket
Laying Lengths Cap End Wall
ThicknessCouplings HalfCouplings
� � � � �� �
in mm in mm in mm in mm in mm in mm in mm
1/8max 0.440 11.15 0.189 4.8 - - - - +0.06 8 +0.03 17 - -ave - - - - 0.156 3.95 - - 0.25 - 0.62 - - -min 0.420 10.65 0.126 3.2 0.135 3.45 0.38 10 -0.06 5 -0.03 15 0.25 6.5
1/4max 0.575 14.60 0.280 7.1 - - - - +0.06 8 +0.03 17 - -ave - - - - 0.181 4.60 - - 0.25 - 0.62 - - -min 0.555 14.10 0.220 5.6 0.158 4.00 0.38 10 -0.06 5 -0.03 15 0.25 6.5
3/8max 0.710 18.05 0.389 9.9 - - - - +0.12 9 +0.06 19 - -ave - - - - 0.198 5.05 - - 0.25 - 0.69 - - -min 0.690 17.55 0.329 8.4 0.172 4.35 0.38 10 -0.12 3 -0.06 16 0.25 6.5
1/2max 0.875 22.20 0.494 12.5 - - - - +0.12 13 +0.06 24 - -ave - - - - 0.235 5.95 - - 0.38 - 0.88 - - 5.21min 0.855 21.70 0.434 11.0 0.204 5.20 0.38 10 -0.12 6 -0.06 21 0.31 8.0
3/4max 1.085 27.55 0.642 16.3 - - - - +0.12 13 +0.06 25 - -ave - - - - 0.274 6.95 - - 0.38 - 0.94 - - 131min 1.065 27.05 0.582 14.8 0.238 6.05 0.50 13 -0.12 6 -0.06 22 0.31 8.0
1max 1.350 34.30 0.845 21.5 - - - - +0.16 17 +0.08 31 - -ave - - - - 0.312 7.90 - - 0.50 - 1.12 - - 141min 1.330 33.80 0.785 19.9 0.273 6.95 0.50 13 -0.16 9 -0.08 27 0.44 11.0
11/4max 1.695 43.05 1.190 30.2 - - - - +0.16 17 +0.08 32 - -ave - - - - 0.312 7.90 - - 0.50 - 1.19 - - 181min 1.675 42.55 1.130 28.7 0.273 6.95 0.50 13 -0.16 9 -0.08 28 0.44 11.0
11/2max 1.935 49.15 1.368 34.7 - - - - +0.16 17 +0.08 34 - -ave - - - - 0.315 8.90 - - 0.50 - 1.25 - - 191min 1.915 48.65 1.308 33.2 0.307 7.80 0.50 13 -0.16 9 -0.08 30 0.50 12.5
2max 2.426 61.60 1.717 43.6 - - - - +0.16 23 +0.08 43 - -ave - - - - 0.430 10.90 - - 0.75 - 1.62 - - 241min 2.406 61.10 1.657 42.1 0.374 9.50 0.62 16 -0.16 15 -0.08 39 0.62 16.0
21/2max 2.931 74.45 - - - +0.4 - - +0.20 24 +0.10 45 - -ave - - - - - 10.4 - - 0.75 - 1.69 - - 291min 2.906 73.80 - - - -0.0 0.62 16 -0.20 14 -0.10 40 0.75 19.0
3max 3560 90.40 - - - +0.4 - - +0.20 24 +0.10 47 - -ave - - - - - 12.2 - - 0.75 - 1.75 - - 341min 3.535 89.30 - - - -0.0 0.62 16 -0.20 14 -0.10 42 0.88 22.0
4max 4.570 116.05 - - - - - - - - - - - -ave - - - - - - - - - - - - - -min 4.545 115.45 - - - - 0.75 19 - - - - 1.12 28.5
7-10
Socket Weld and Threaded Fittings
Aal
co T
el. 0
1932
250
100
Fax
: 019
32 2
5010
1 E
-mai
l: M
arke
ting@
amar
i-met
als.
com
9000
lb S
ocke
t Wel
d Fi
tting
s - A
NSI
B16
.11
Not
e-
BS 3
799
does
not
spe
cify
Cla
ss 9
000
lb s
ocke
t wel
d fit
tings
. Oth
erw
ise,
not
es fo
r Cla
ss 6
000
lb fi
tting
s on
pag
es 7
-8 a
nd 7
-9 a
lso
appl
y to
this
tabl
e.
Dim
ensi
ons
and
tole
ranc
es (b
ased
on
ASM
E/A
NSI
B16
.11-
1991
)
NP
S
max/ave/min
Cen
tre to
Bot
tom
of S
ocke
tS
ocke
t B
ore
Dia
met
erBo
re D
iam
eter
of
Fitt
ings
Soc
ket
Wal
l Thi
ckne
ssB
ody
Wal
lD
epth
of S
ocke
tLa
ying
Len
gths
Cap
End
W
all T
hick
ness
90°
Elbo
ws,
Tees
, &C
ross
es
45°
Elbo
ws
Cou
plin
gsH
alf C
oupl
ings
��
��
��
���
�
inm
min
mm
inm
min
mm
inm
min
mm
inm
min
mm
inm
min
mm
1 /2
max
+0.0
627
+0.0
617
0.87
522
.20
0.28
27.
2-
--
--
-+0
.12
13+0
.06
24-
-av
e1.
00-
0.62
--
--
-0.
368
9.35
--
--
0.38
-0.
88-
--
min
-0.0
624
-0.0
614
0.85
521
.70
0.22
25.
60.
322
8.20
0.29
47.
450.
3810
-0.1
26
-0.0
621
0.44
11.0
3 /4
max
+0.0
630
+0.0
621
1.08
527
.55
0.46
411
.8-
--
--
-+0
.12
13+0
.06
25-
-av
e1.
12-
0.75
--
--
-0.
385
9.80
--
--
0.38
-0.
94-
--
min
-0.0
627
-0.0
617
1.06
527
.05
0.40
410
.30.
337
8.55
0.30
87.
800.
5013
-0.1
26
-0.0
622
0.50
12.5
1m
ax+0
.08
34+0
.08
231.
350
34.3
00.
629
16.0
--
--
--
+0.1
617
+0.0
831
--
ave
1.25
-0.
81-
--
--
0.44
811
.40
--
--
0.50
-1.
12-
--
min
-0.0
830
-0.0
819
1.33
033
.80
0.56
914
.50.
392
9.95
0.35
89.
100.
5013
-0.1
69
-0.0
827
0.56
14.0
11 /4m
ax+0
.08
37+0
.08
241.
695
43.0
50.
926
23.5
--
--
--
+0.1
617
+0.0
832
--
ave
1.38
-0.
88-
--
--
0.47
812
.15
--
--
0.50
-1.
19-
--
min
-0.0
833
-0.0
820
1.67
542
.55
0.86
622
.00.
418
10.6
00.
382
9.70
0.50
13-0
.16
9-0
.08
280.
5614
.0
11 /2m
ax+0
.08
40+0
.08
281.
935
49.1
51.
130
28.7
--
--
--
+0.1
617
+0.0
834
--
ave
1.50
-1.
00-
--
--
0.50
012
.70
--
--
0.50
-1.
25-
--
min
-0.0
836
-0.0
823
1.91
548
.65
1.07
027
.20.
438
11.1
50.
400
10.1
50.
5013
-0.1
69
-0.0
830
0.62
16.0
2m
ax+0
.08
56+0
.08
312.
426
61.6
01.
533
38.9
--
--
--
+0.1
623
+0.0
843
--
ave
2.12
-1.
12-
--
--
0.54
513
.85
--
--
0.75
-1.
62-
--
min
-0.0
852
-0.0
826
2.40
661
.10
1.47
337
.40.
477
12.1
50.
436
11.0
50.
6216
-0.1
615
-0.0
839
0.75
19.0
90°
Elbo
wC
ross
Tee
45°E
lbow
Cou
plin
gH
alf-C
oupl
ing
Cap
Socket Weld and Threaded Fittings
7-11
Aal
co T
el. 0
1932
250
100
Fax
: 019
32 2
5010
1 E
-mai
l: M
arke
ting@
amar
i-met
als.
com
2000
lb, 3
000
lb a
nd 6
000
lb T
hrea
ded
Fitti
ngs
- AN
SI B
16.1
1/BS
379
9
Not
e-
Dim
ensi
ons
and
tole
ranc
es s
how
n ar
e as
spe
cifie
d in
ASM
E/AN
SI B
16.1
1-19
91. T
hese
agr
ee s
ubst
antia
lly w
ith B
S 37
99:1
974.
Exc
eptio
ns a
re in
dica
ted
in th
e fo
llow
ing
note
s.-
BS 3
799
does
not
cov
er a
ny C
lass
200
0 lb
fitti
ngs,
and
Cla
ss 6
000
lb fi
tting
s w
ith N
PS <
1 /2.
-BS
379
9 di
men
sion
s G
and
L2
vary
slig
htly
from
the
ANSI
val
ues
quot
ed. D
imen
sion
B is
not
spe
cifie
d in
BS
3799
.-
Dim
ensi
on B
is th
e le
ngth
of p
erfe
ct th
read
. L2
is th
e ef
fect
ive
leng
th o
f thr
ead
base
d on
AN
SI/A
SME
B1.2
0.1
(NTP
), se
e pa
ge 1
0-11
.
Dim
ensi
ons
and
tole
ranc
es (b
ased
on
ASM
E/A
NSI
B16
.11-
1991
and
BS
3799
:197
4)
NPS
Cen
tre to
End
Cen
tre to
End
45°
OD
of B
and,
min
Wal
l Thi
ckne
ss, m
inLe
ngth
of T
hrea
d, m
in.
��
��
��
2000
lb30
00lb
6000
lb20
00lb
3000
lb60
00lb
2000
lb30
00lb
6000
lb20
00lb
3000
lb60
00lb
inm
min
mm
inm
min
mm
inm
min
mm
inm
min
mm
inm
min
mm
inm
min
mm
inm
min
mm
1 /80.
8121
0.81
210.
9725
0.69
170.
6917
0.75
190.
8822
0.88
221.
0025
0.12
53.
00.
125
3.0
0.25
06.
50.
256.
50.
2639
6.5
1 /40.
8121
0.97
251.
1229
0.69
170.
7519
0.88
220.
8822
1.00
251.
3133
0.12
53.
00.
130
3.5
0.26
06.
50.
328.
00.
4018
10.0
3 /80.
9725
1.12
291.
3133
0.75
190.
8822
1.00
251.
0025
1.31
331.
5038
0.12
53.
00.
138
3.5
0.27
57.
00.
369.
00.
4078
10.5
1 /21.
1229
1.31
331.
5038
0.88
221.
0025
1.12
291.
3133
1.50
381.
8146
0.12
53.
00.
161
4.0
0.32
18.
00.
4311
.00.
5337
13.5
3 /41.
3133
1.50
381.
7544
1.00
251.
1229
1.31
331.
5038
1.81
462.
1956
0.12
53.
00.
170
4.5
0.33
68.
50.
5012
.50.
5457
14.0
11.
5038
1.75
442.
0051
1.12
291.
3133
1.38
351.
8146
2.19
562.
4462
0.14
53.
50.
196
5.0
0.39
110
.00.
5814
.50.
6828
17.5
11 /4
1.75
442.
0051
2.38
601.
3133
1.38
351.
6943
2.19
562.
4462
2.97
750.
153
4.0
0.20
85.
50.
417
10.5
0.67
17.0
0.70
6818
.011 /
22.
0051
2.38
602.
5064
1.38
351.
6943
1.72
442.
4462
2.97
753.
3184
0.15
84.
00.
219
5.5
0.43
611
.00.
7018
.00.
7235
18.5
22.
3860
2.50
643.
2583
1.69
431.
7245
2.06
522.
9775
3.31
844.
0010
20.
168
4.5
0.28
17.
00.
476
12.0
0.75
19.0
0.75
6519
.021 /
23.
0076
3.25
833.
7595
2.06
522.
0652
2.50
643.
6292
4.00
102
4.75
121
0.22
15.
50.
301
7.5
0.60
215
.50.
9323
.51.
138
29.0
33.
3886
3.75
954.
1910
62.
5064
2.50
643.
1279
4.31
110
4.75
121
5.75
146
0.23
66.
00.
348
9.0
0.65
516
.51.
0226
.01.
200
30.5
44.
1910
64.
5011
44.
5011
43.
1279
3.12
793.
1279
5.75
146
6.00
152
6.00
152
0.25
86.
50.
440
11.0
0.73
518
.51.
0927
.51.
300
33.0
90°
Elbo
wTe
eC
ross
45°
Elbo
w
7-12
Socket Weld and Threaded Fittings
Aal
co T
el. 0
1932
250
100
Fax
: 019
32 2
5010
1 E
-mai
l: M
arke
ting@
amar
i-met
als.
com
3000
lb a
nd 6
000
lb T
hrea
ded
Fitti
ngs
- AN
SI B
16.1
1/BS
379
9
Not
e-
Dim
ensi
ons
and
tole
ranc
es s
how
n ar
e as
spe
cifie
d in
ASM
E/AN
SI B
16.1
1-19
91. T
hese
agr
ee s
ubst
antia
lly w
ith B
S 37
99:1
974.
Exc
eptio
ns a
re in
dica
ted
in th
e fo
llow
ing
note
s.-
BS 3
799
does
not
cov
er C
lass
600
0 lb
cap
s w
ith N
PS >
2.-
BS 3
799
dim
ensi
ons
G a
nd L
2 va
ry s
light
ly fr
om th
e AN
SI v
alue
s qu
oted
. Dim
ensi
on B
is n
ot s
peci
fied
in B
S 37
99.
-D
imen
sion
B is
the
leng
th o
f per
fect
thre
ad. L
2 is
the
effe
ctiv
e le
ngth
of t
hrea
d ba
sed
on A
NSI
/ASM
E B1
.20.
1 (N
TP),
see
page
10-
11.
Dim
ensi
ons
and
tole
ranc
es (b
ased
on
ASM
E/A
NSI
B16
.11-
1991
and
BS
3799
:197
4)
NPS
End
to E
nd C
oupl
ings
End
to E
nd C
aps
OD
End
Wal
l Thi
ckne
ssLe
ngth
of T
hrea
d�
��
��
�
3000
lb &
600
0lb
3000
lb60
00lb
3000
lb60
00lb
3000
lb60
00lb
inm
min
mm
inm
min
mm
inm
min
mm
inm
min
mm
inm
m1 /
81.
2532
0.75
190.
6216
0.88
220.
195.
00.
256.
50.
2639
6.5
1 /4
1.38
351.
0025
1.06
270.
7519
1.00
250.
195.
00.
256.
50.
328.
00.
4018
10.0
3 /8
1.50
381.
0025
1.06
270.
8822
1.25
320.
195.
00.
256.
50.
369.
00.
4078
10.5
1 /2
1.88
481.
2532
1.31
331.
1229
1.50
380.
256.
50.
318.
00.
4311
.00.
5337
13.5
3 /4
2.00
511.
4437
1.50
381.
3835
1.75
440.
256.
50.
318.
00.
5012
.50.
5457
14.0
12.
3860
1.62
411.
6943
1.75
442.
2557
0.38
9.5
0.44
11.0
0.58
14.5
0.68
2817
.511 /4
2.62
671.
7544
1.81
462.
2557
2.50
640.
389.
50.
4411
.00.
6717
.00.
7068
18.0
11 /23.
1279
1.75
441.
8848
2.50
643.
0076
0.44
11.0
0.50
12.5
0.70
18.0
0.72
3518
.52
3.38
861.
8848
2.00
513.
0076
3.62
920.
5012
.50.
6216
.00.
7519
.00.
7565
19.0
21 /23.
6292
2.38
602.
5064
3.62
924.
2510
80.
6216
.00.
7519
.00.
9323
.51.
138
29.0
34.
2510
82.
5665
2.69
684.
2510
85.
0012
70.
7519
.00.
8822
.01.
0226
.01.
200
30.5
44.
7512
12.
6968
2.94
755.
5014
06.
2515
90.
8822
.01.
1228
.51.
0927
.51.
300
33.0
Cou
plin
gH
alf C
oupl
ing
Cap
Socket Weld and Threaded Fittings
7-13
Aal
co T
el. 0
1932
250
100
Fax
: 019
32 2
5010
1 E
-mai
l: M
arke
ting@
amar
i-met
als.
com
Plug
s an
d Bu
shin
gs -
ANSI
B16
.11/
BS 3
799
Not
es-
Plug
s an
d bu
shes
are
not
des
igna
ted
by C
lass
and
may
be
used
at r
atin
gs u
p to
Cla
ss 6
000
lb.
-D
imen
sion
s an
d to
lera
nces
sho
wn
are
as s
peci
fied
in A
SME/
ANSI
B16
.11-
1991
. The
se a
gree
sub
stan
tially
with
BS
3799
:197
4.
Dim
ensi
ons
and
tole
ranc
es (b
ased
on
ASM
E/A
NSI
B16
.11-
1991
and
BS
3799
:197
4)
NPS
Leng
th
min
Squ
are
Hea
d P
lugs
Rou
nd H
ead
Plug
sH
ex P
lugs
and
Bus
hing
sH
eigh
t of S
quar
em
inW
idth
Fla
ts
min
Dia
met
er o
f Hea
dno
min
alLe
ngth
min
Wid
th F
lats
no
min
alH
ex H
eigh
t, m
in
��
��
�
���������
������
inm
min
mm
inm
min
mm
inm
min
mm
inm
min
mm
1 /8
0.38
9.5
0.25
60.
287.
00.
4110
1.38
350.
4411
.00.
256
1 /4
0.44
11.0
0.25
60.
389.
50.
5313
1.62
410.
6216
.00.
123
0.25
63 /
80.
5012
.50.
318
0.44
11.0
0.69
171.
6241
0.69
17.5
0.16
40.
318
1 /2
0.56
14.5
0.38
100.
5614
.50.
8421
1.75
440.
8822
.00.
195
0.31
83 /
40.
6216
.00.
4411
0.62
16.0
1.06
271.
7544
1.06
27.0
0.22
60.
3810
10.
7519
.00.
5013
0.81
20.5
1.31
332.
0051
1.38
35.0
0.25
60.
3810
11 /4
0.81
20.5
0.56
140.
9424
.01.
6943
2.00
511.
7544
.50.
287
0.56
1411 /
20.
8120
.50.
6216
1.12
28.5
1.91
482.
0051
2.00
51.0
0.31
80.
6216
20.
8822
.00.
6917
1.31
33.5
2.38
602.
5064
2.50
63.5
0.34
90.
6917
21 /21.
0627
.00.
7519
1.50
38.0
2.88
732.
7570
3.00
76.0
0.38
100.
7519
31.
1228
.50.
8121
1.69
43.0
3.50
892.
7570
3.50
89.0
0.41
100.
8121
41.
2532
.01.
0025
2.50
63.5
4.50
114
3.00
764.
6211
7.5
0.50
131.
0025
Squa
re H
ead
Plug
Hex
Hea
d Pl
ugR
ound
Hea
d Pl
ugH
exag
onal
Hea
dBu
shin
gFl
ush
Bush
ing
Not
eH
ex
bush
ings
of
on
e si
zere
duct
ion
shou
ld n
ot b
e us
edw
here
they
cou
ld b
e su
bjec
t to
harm
ful
load
s an
d pr
essu
res
othe
r tha
n in
tern
al p
ress
ure.
7-14
Socket Weld and Threaded Fittings
Aalco Tel. 01932 250100 Fax: 01932 250101 E-mail: Marketing@amari-metals.com
Hexagonal and Round Nipples - BS 3799
Note- Other round nipple lengths, L, are available when specified.
Hexagonal nipple dimensions (based on BS 3799:1974)
Nominal Size �min
��min �
min�
min�
min�minEqual Reducing 3000 lb 6000 lb
in mm in mm mm mm mm mm mm mm mm1/8 6 - - 11 5 2 6 10 - 261/4 8 - - 15 8 6 6 15 - 36- - 1/4 x 1/8 8 x 6 15 5 2 6 15 10 31
3/8 10 - - 18 11 8 8 16 - 40- - 3/8 x 1/4 10 x 8 18 8 6 8 16 15 39
1/2 15 - - 22 14 11 8 20 - 48- - 1/2 x 3/8 15 x 10 22 11 8 8 20 16 44- - 1/2 x 1/4 15 x 8 22 8 6 8 20 15 43
3/4 20 - - 27 19 13 10 21 - 52- - 3/4 x 1/2 20 x 15 27 14 11 9 21 20 50- - 3/4 x 3/8 20 x 10 27 11 8 9 21 16 461 25 - - 35 24 17 10 25 - 60- - 1 x 3/4 25 x 20 35 19 13 10 25 21 56- - 1 x 1/2 25 x 15 35 14 11 10 25 20 55
11/2 40 - - 50 38 30 16 26 - 68- - 11/2 x 1 40 x 25 50 24 17 16 26 25 67- - 11/2 x 3/4 40 x 20 50 19 13 16 26 21 63- - 11/2 x 1/2 40 x 15 50 14 11 16 26 20 622 50 - - 62 49 39 17 27 - 71- - 2 x 11/2 50 x 40 62 38 30 17 27 26 70- - 2 x 1 50 x 25 62 24 17 18 27 25 70- - 2 x 3/4 50 x 20 62 19 13 17 27 21 65- - 2 x 1/2 50 x 15 62 14 11 18 27 20 65
Round nipple dimensions (based on BS 3799:1974)
Nominal SizeStandard Lengths Wall Thickness
�
in mm mm mm mm mm 3000 lb 6000 lb1/8 6 50 75 100 150
Schedule 80
-1/4 8 50 75 100 150 -3/8 10 50 75 100 150 -1/2 15 - 75 100 150
XXS
3/4 20 - 75 100 1501 25 - 75 100 150
11/2 40 - 75 100 1502 50 - 75 100 150
21/2 65 - - 100 1503 80 - - 100 1504 100 - - - 150
Hexagonal Nipples Round Nipples
Socket Weld and Threaded Fittings
7-15Aalco Tel. 01932 250100 Fax: 01932 250101 E-mail: Marketing@amari-metals.com
Welding Bosses - BS 3799
Threaded welding boss dimensions (BS 3799:1974)
Nominal SizeLength of Thread Length Bore Diameter Outside Diameter
�� � ��
3000 lb 6000 lbin mm mm mm mm mm mm1/8 6 6.70 38 8.4 16 221/4 8 10.21 41 11.1 19 263/8 10 10.36 45 14.2 22 321/2 15 13.56 51 18.0 29 383/4 20 13.86 51 23.0 35 451 25 17.34 51 29.0 45 60
11/2 40 18.38 51 44.0 64 762 50 19.22 51 56.0 76 95
21/2 65 28.89 51 67.0 95 -3 80 30.48 57 82.0 110 -4 100 33.02 64 95.0 140 -
Socket-welding welding boss dimensions (BS 3799:1974)
NPS
Bore Diameter of Socket
min
Socket Wall Thickness
minBore Diameter of
Fitting LengthDepth of Socket
min
��� ��
�� ��3000 lb 6000 lb 3000 lb 6000 lbin mm mm mm mm mm mm mm mm1/8 6 10.7 3.2 - 6.8 - 28 101/4 8 14.1 3.3 - 9.2 - 32 103/8 10 17.6 3.5 - 12.5 - 34 111/2 15 21.8 4.1 5.2 15.5 11.8 38 133/4 20 27.4 4.3 6.1 21.0 15.5 38 131 25 34.1 5.0 7.0 26.5 20.7 35 16
11/2 40 49.0 5.6 7.8 40.5 34.0 32 192 50 61.0 6.1 9.5 52.0 43.0 29 22
21/2 65 73.8 7.7 10.4 62.0 54.0 29 223 80 89.7 8.3 12.2 78.0 66.0 29 22
Threaded Fitting Socket Weld Fitting
7-16
Socket Weld and Threaded Fittings
Aalco Tel. 01932 250100 Fax: 01932 250101 E-mail: Marketing@amari-metals.com
Threaded Unions - BS 3799
Threaded union dimensions (BS 3799:1974)
Nominal Size
3000 lb
End to EndWidth A/F Union Nut
min
Height of Union Nut
min
Width A/F of Ends min
Thickness of Shoulder
min
Length of Thread
min� � � � � �
in mm mm mm mm mm mm mm1/8 6 40 32 16 17 3.2 6.701/4 8 43 32 18 19 3.2 10.213/8 10 48 36 19 22 3.2 10.361/2 15 51 43 21 30 4.0 13.563/4 20 57 50 24 36 4.8 13.861 25 64 60 25 41 4.8 17.34
11/4 32 70 70 29 50 5.6 17.9311/2 40 79 78 30 60 5.6 18.382 50 89 95 37 70 6.4 19.22
21/2 65 118 125 48 85 9.6 28.893 80 121 140 51 100 12.7 30.48
Socket Weld and Threaded Fittings
7-17Aalco Tel. 01932 250100 Fax: 01932 250101 E-mail: Marketing@amari-metals.com
Socket Weld Unions - BS 3799
Note- Bore diameter D corresponds to schedule 40 pipe.
Socket weld union dimensions (BS 3799:1974)
NPS
3000 lb
Depth of Socket
min
Distance between Bottom of Sockets
min
Bore Diameter
of Sockets
min
Socket Wall
Thicknessmin
Bore Diameterof Union
Thickness of
Shoulder min
Width A/F of Nut min
Height of Nut min
� � � � � � �
in mm mm mm mm mm mm mm mm mm1/8 6 10 17 10.7 3.2 6.8 3.2 32 161/4 8 10 17 14.1 3.3 9.2 3.2 32 183/8 10 10 17 17.6 3.5 12.5 3.2 36 191/2 15 10 18 21.8 4.1 15.5 4.0 41 213/4 20 13 20 27.4 4.3 21.0 4.8 50 241 25 13 26 34.1 5.0 26.5 4.8 60 25
11/4 32 13 28 42.9 5.3 35.0 5.6 70 2911/2 40 13 30 49.0 5.6 40.5 5.6 78 302 50 16 36 61.0 6.1 52.0 6.4 95 37
21/2 65 16 57 73.8 7.7 62.0 9.6 125 483 80 16 70 89.7 8.3 78.0 12.7 140 51
7-18
Socket Weld and Threaded Fittings
Aalco Tel. 01932 250100 Fax: 01932 250101 E-mail: Marketing@amari-metals.com
Swage Nipples - BS 3799
Dimensions of swage nipples (BS 3799:1974)
Nominal Size
Parallel Length, min Eccentricity Wall Thickness
� � ��
��(both ends)Threaded
/Plain Plain Threaded3000 lb 6000 lb 3000 lb 6000 lb 6000 lbin mm mm mm mm mm mm
3/8 x 1/4 10 x 8 76 48 16 1.6 -
Schedule 80
- -1/2 x 3/8 15 x 10 89 56 19 1.6 - - -1/2 x 1/4 15 x 8 89 56 19 3.2 - - -3/4 x 1/2 20 x 15 95 57 22 2.4 2.4 Schedule
160 XXS3/4 x 3/8 20 x 10 95 57 22 4.0 - - -1 x 3/4 25 x 20 102 64 22 2.8 2.0
Schedule 160 XXS
1 x 1/2 25 x 15 102 64 22 5.2 4.411/2 x 1 40 x 25 114 70 25 6.7 6.411/2 x 3/4 40 x 20 114 70 25 9.5 8.311/2 x 1/2 40 x 15 114 70 25 11.9 10.72 x 11/2 50 x 40 165 108 29 5.6 5.22 x 1 50 x 25 165 108 29 12.7 11.52 x 3/4 50 x 20 165 108 29 15.5 13.52 x 1/2 50 x 15 165 108 29 17.5 15.921/2 x 2 65 x 50 178 114 32 4.8 3.2
21/2 x 11/2 65 x 40 178 114 32 10.3 8.33 x 21/2 80 x 65 203 133 41 7.1 6.73 x 2 80 x 50 203 133 41 11.9 9.9
3 x 11/2 80 x 40 203 133 41 17.5 15.54 x 3 100 x 80 229 140 48 11.9 10.7
4 x 21/2 100 x 65 229 140 48 19.1 17.5
Plain Threaded Threaded Plain
Socket Weld and Threaded Fittings
7-19Aalco Tel. 01932 250100 Fax: 01932 250101 E-mail: Marketing@amari-metals.com
OutletsOutlets may be used in place of welded or threaded tees to reduce costs and providemore flexible fabrication (‘run your pipe then weld on fittings’) while maintaining full pipestrength for all sizes, weights and schedules. The following pages contain the dimensiontables for socket weld, threaded and buttweld outlets. Note- Manufacture’s information is used as the basis for information in this outlets subsection. Manufacturers’ data may vary.
Specifications❍ Manufacture. Socket weld and threaded outlets
are manufactured to the requirements of ASME/ANSI B16.11 - Forged fitting, socket welding andthreaded, although outlet dimensions are notspecified in B16.11. Buttweld outlets aremanufactured to the requirements of ASME/ANSIB16.9 - Factory-made wrought steel buttweldingfittings, although outlet dimensions are notspecified in B16.9.
❍ Pressure Rating. Outlets are rated the same asseamless steel pipe, as defined in the AmericanNational Standard Codes for Pressure Piping,ANSI B31.1 and B31.3, the ASME Boiler andPressure Vessel Code. Refer to page 5-28 for asummary of pipe pressure rating calculations.
DesignationsIn order to reduce warehouse inventories, outlets of the same size are designed to be used with the a range ofrun pipe sizes. This can be done without causing a problem when welding because the resulting maximum gapbetween welded surfaces (caused by the curvature of the outlet when compared with the pipe) is only 1/32 in(0.8 mm). The table below shows the range of outlets available. For example: outlets with a run size range (e.g. 8 - 3 x 1/2) will fit on any size of run pipes in the range (e.g. 3,31/2, 4, 5, 6 or 8).
Outlet Pipe Sizes (NPS)1/2 3/4 1 11/4 11/2 2 21/2 3 31/2 4 >4
Run pipe sizes (NPS) for:3000 lb Socket Weld Outlets, 3000 lb Threaded Outlets,Std & XS Buttweld Outlets,
1/2 3/4 1 11/4 11/2 2 21/2 3 31/2 4
Ord
er to
spe
cific
run
pipe
siz
e31/4 1 11/4 11/2 2 21/2 3 31/2 4 51 11/2-11/4 11/2 2 21/2 3 31/2 4 5 6
11/2-11/4 21/2-2 2 21/2 3 31/2 4 5 6 8
21/2-2 5-3 21/2 31/2-3 4-31/2 4 5 6 8 108-3 12-6 31/2-3 5-4 6-5 5 6 8 10 14-2
36-10 36-14 5-4 8-6 12-8 6 8 10 14-12 20-6Flat Flat 10-6 18-10 24-14 10-8 12-10 14-12 20-16 36-4
- - 36-12 36-20 36-26 18-12 18-14 20-16 36-24 Flat- - Flat Flat Flat 36-20 36-20 36-24 - -- - - - - Flat Flat Flat - -
Run pipe sizes (NPS) for: 6000 lb Socket weld Outlets,6000 lb Threaded Outlets,XXS Buttweld Outlets.
1-3/4 1 11/4-11/2 11/2 2 21/2
Order to specific run pipe size
2-11/4 21/2-11/4 21/2-2 21/2-2 21/2 36-21/2 10-3 10-3 31/2-3 31/2-3 436-8 36-12 36-12 8-4 5-4 5Flat Flat Flat 20-10 8-6 6
- - - 36-24 18-10 10-8- - - Flat 36-20 20-12- - - - Flat 36-24- - - - - Flat
7-20
Socket Weld and Threaded Fittings
Aalco Tel. 01932 250100 Fax: 01932 250101 E-mail: Marketing@amari-metals.com
Socket Weld Outlets
3000 lb socket weld outlet dimensions and weights
Outlet Size
Reducing sizesWeight
Full sizesWeight
� � � � � � �
mm mm mm mm kg/piece mm mm mm mm mm kg/
piece1/2 25.50 24.00 31.80 10.00 0.140 25.50 22.40 16.00 31.80 10.00 0.0603/4 27.00 30.00 36.60 13.00 0.150 27.00 30.00 21.00 36.60 13.00 0.1101 33.40 36.50 46.10 13.00 0.300 33.40 36.50 26.70 46.10 13.00 0.300
11/4 33.40 44.50 55.60 13.00 0.400 33.40 44.50 35.00 55.60 13.00 0.30011/2 34.80 51.00 62.00 13.00 0.470 34.80 51.00 40.90 62.00 13.00 0.4002 38.00 65.00 74.70 16.00 0.730 38.00 65.00 52.50 74.70 16.00 0.630
21/2 46.00 76.15 87.40 16.00 1.250 46.00 76.15 62.80 87.40 16.00 1.0303 50.70 93.50 104.80 16.00 1.720 50.70 93.50 77.90 104.80 16.00 1.700
31/2 53.80 101.50 122.30 19.00 1.950 53.30 112.75 90.10 117.50 19.00 1.9504 57.00 120.50 130.20 19.00 3.300 55.50 127.00 102.20 130.20 19.00 3.000
6000 lb socket weld outlet dimensions and weights
Outlet Size
Reducing sizesWeight
� � �
mm mm mm mm kg/piece1/2 31.50 19.00 40.00 10.00 0.2503/4 36.50 25.50 46.00 13.00 0.3701 39.60 33.40 57.20 13.00 0.600
11/4 41.00 38.00 65.10 13.00 0.75011/2 42.70 49.30 76.30 13.00 0.920
Reducing Size Full Size
Socket Weld and Threaded Fittings
7-21Aalco Tel. 01932 250100 Fax: 01932 250101 E-mail: Marketing@amari-metals.com
Threaded and Nipple Outlets
3000 lb threaded outlet dimensions and weights
Outlet Size
Reducing sizesWeight
Full sizesWeight
� � � � � � �
mm mm mm kg/piece mm mm mm mm kg/piece1/2 25.50 24.00 31.80 0.110 25.50 24.00 16.00 31.80 0.0703/4 27.00 30.00 36.60 0.160 27.00 30.00 20.65 36.60 0.1101 33.40 36.50 46.10 0.300 33.40 36.50 27.00 46.10 0.200
11/4 33.40 44.50 55.60 0.410 33.40 44.50 34.90 55.60 0.32011/2 34.80 51.00 62.00 0.450 34.80 51.00 41.20 62.00 0.4102 38.00 65.00 74.70 0.800 38.00 65.00 52.40 74.70 0.650
21/2 46.00 76.15 87.40 1.370 46.00 76.15 63.50 87.40 1.1303 50.70 93.50 104.80 2.000 50.70 93.50 77.80 104.80 1.950
31/2 53.80 101.50 122.30 2.610 53.30 112.75 90.50 117.50 2.0504 57.00 120.50 130.20 3.230 55.50 120.50 103.20 130.20 3.090
6000 lb threaded outlet dimensions and weights
Outlet Size
Reducing sizesWeight
� � �
mm mm mm kg/piece1/2 31.50 19.00 40.00 0.0203/4 36.50 25.50 46.00 0.3501 39.60 33.40 57.20 0.600
11/4 41.00 38.00 65.10 071011/2 42.70 49.30 76.30 0.9002 52.10 70.00 92.10 2.300
Reducing Size Full Size
Nipple
Plain end nipple outlet dimensions
Outlet Size
Reducing sizes3000 lb 6000 lb
� � � �
mm mm mm mm1/2 89 24 89 14.53/4 89 30 89 19.01 89 36.5 89 25.5
11/4 89 44.5 89 33.411/2 89 51 89 38.02 89 65 89 43
7-22
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Buttweld Outlets
Standard buttweld outlet dimensions and weights
Outlet SizeReducing sizes
WeightFull sizes
Weight� � � � �
mm mm kg/piece mm mm mm kg/piece1/2 19.00 24.00 0.08 19.00 24.00 15.80 0.073/4 22.20 30.00 0.11 22.20 30.00 21.00 0.111 27.00 36.50 0.25 27.00 36.50 26.60 0.18
11/4 31.50 44.50 0.35 31.50 44.50 35.00 0.3211/2 33.40 51.00 0.45 33.40 51.00 40.90 0.362 38.00 65.00 0.80 38.00 65.00 52.50 0.68
21/2 41.20 76.15 1.13 41.20 76.15 62.80 1.023 44.50 93.50 1.82 44.50 93.50 78.00 1.70
31/2 47.50 112.60 2.50 47.50 112.60 90.20 2.304 51.00 120.50 2.86 51.00 120.50 102.20 3.105 57.00 141.30 4.65 57.00 141.30 128.20 3.906 60.30 170.00 6.45 60.30 170.00 154.00 6.708 69.80 220.50 10.66 69.80 220.50 202.50 13.00
10 78.00 274.00 18.00 78.00 274.00 254.00 16.0012 86.00 324.00 27.00 86.00 324.00 304.50 27.0014 89.00 356.00 30.00 89.00 356.00 336.50 32.0016 94.00 406.00 34.00 94.00 406.00 387.00 42.0018 97.00 459.00 44.00 103.00 473.00 438.00 57.0020 102.00 508.00 54.00 117.00 508.00 489.00 80.0024 144.00 609.00 101.00 144.00 609.00 590.00 114.0026 156.00 660.00 120.00 156.00 660.00 641.00 138.0030 175.00 762.00 190.00 175.00 762.00 743.00 230.0036 206.00 914.00 310.00 206.00 914.00 895.00 336.00
Reducing Size Full Size
Socket Weld and Threaded Fittings
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Buttweld Outlets
Extra strong (XS) buttweld outlets dimensions and weights
Outlet SizeReducing sizes
WeightFull sizes
Weight� � � � �
mm mm kg/piece mm mm mm kg/piece1/2 19 24.00 0.09 19.00 24.00 13.90 0.073/4 22.20 30.00 0.14 22.20 30.00 18.90 0.111 27.00 36.50 0.21 25.40 36.50 24.30 0.18
11/4 31.50 44.50 0.41 28.50 44.50 32.80 0.3211/2 33.40 51.00 0.50 31.50 51.00 38.10 0.412 38.00 65.00 0.80 38.00 65.00 49.30 0.75
21/2 41.20 76.15 1.18 41.20 76.15 59.00 1.153 44.50 93.50 1.90 44.50 93.50 73.70 1.90
31/2 47.50 112.60 2.55 47.50 112.60 85.40 2.304 51.00 120.50 3.00 51.00 120.50 97.20 3.505 57.00 141.30 4.75 57.00 141.30 122.30 4.306 78.00 170.00 10.50 78.00 170.00 146.30 6.808 98.50 220.00 17.00 98.50 220.00 194.00 14.60
10 94.00 265.00 21.00 98.30 256.00 247.50 21.0012 103.00 613.00 28.00 100.00 320.00 298.00 28.0014 100.00 351.00 32.00 105.50 355.00 330.00 34.5016 106.50 403.00 46.50 113.00 419.00 381.00 52.2018 111.00 456.00 59.00 119.00 474.00 432.00 59.0020 119.00 510.00 72.00 127.00 528.00 482.50 85.0024 152.00 610.00 142.00 152.00 610.00 584.20 146.0026 165.00 660.00 168.00 165.00 660.00 635.00 182.0030 181.00 762.00 218.00 181.00 762.00 738.00 255.0036 212.50 914.00 404.00 212.00 914.00 889.00 446.00
Schedule 160 and double extra strong (XXS) buttweld outlets dimensions and weights
Outlet SizeReducing sizes
WeightFull sizes
� � � � �
mm mm kg/piece mm mm mm1/2 28.50 14.30 0.110 28.50 14.30 0.1103/4 31.50 19.00 0.320 31.50 19.00 0.3201 38.00 25.50 0.380 38.00 25.50 0.380
11/4 44.50 33.40 0.570 44.50 33.40 0.57011/2 50.70 38.00 0.800 50.70 38.00 0.8002 55.50 42.90 1.00 55.50 42.90 1.00
21/2 61.80 53.90 1.550 61.80 53.90 1.5503 73.00 73.00 2.900 73.00 73.00 2.9004 84.00 98.40 4.770 84.00 98.40 4.7705 93.50 122.20 6.470 93.50 122.20 6.4706 104.70 146.00 12.80 104.70 146.00 13.80
Reducing Size Full Size
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45° Lateral Outlets
3000 lb lateral outlets - for 45° lateral connections dimensions and weights
Nominal Run Sizes
Outlet SizeDimensions
Weight� �
OD of OutletSocket Weld &
Threaded Buttweld
in mm mm mm - kg/piece21/2-11/4,
12-31/4 36.5 39.7 31.8
Outside diameter at
bevel matches the outlet
pipe diameter
0.23
21/2-11/4, 12-3
3/8 36.5 39.7 31.8 0.23
21/2-11/4, 12-3
1/2 36.5 39.7 31.8 0.30
11/2-11/4, 5-2, 12-6
3/4 43.6 47.6 35.7 0.34
21/2-2, 5-2, 12-6 1 54.0 57.2 45.2 0.52
21/2-2, 5-3, 12-6 11/4 67.5 61.9 54.6 0.86
21/2-2, 5-3,12-6 11/2 76.2 66.7 63.5 1.20
5-4, 8-6,12-10 2 104.8 81.0 82.6 3.29
6000 lb lateral outlets - for 45° lateral connections dimensions and weights
Nominal Elbow Size
Outlet SizeDimensions
Weight� �
OD of OutletSocket Weld &
Threaded Buttweld
in mm mm mm - kg/piece21/2-11/4,
12-31/4 36.5 39.7 31.8
Outside diameter at
bevel matches the outlet
pipe diameter
0.34
21/2-11/4, 12-3
3/8 36.5 39.7 31.8 0.34
11/2-11/4, 5-2,12-6
1/2 43.6 47.6 35.7 0.39
21/2-2, 5-3,12-6
3/4 54.0 57.2 45.2 0.57
21/2-2, 5-3,12-6 1 67.5 61.9 54.8 1.00
21/2-2, 5-3,12-6 11/4 76.2 66.7 63.5 1.32
5-4, 8-6, 12-10 11/2 104.8 81.0 82.6 2.80
ThreadedSocket Weld Buttweld
Socket Weld and Threaded Fittings
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Elbow Outlets
3000 lb elbow outlet for 90° long radius elbow, dimensions and weights
Nominal Elbow Size
Outlet SizeDimensions
Weight� �
OD of OutletSocket Weld &
Threaded Buttweld
in mm mm mm - kg/piece36-11/4 1/4 38.1 38.1 31.8
Outside diameter at
bevel matches the outlet
pipe diameter
0.2336-11/4 3/8 38.1 38.1 31.8 0.2336-11/4 1/2 38.1 38.1 31.8 0.3036-11/4 3/4 43.6 45.2 35.7 0.3436-2 1 54.0 52.4 45.2 0.5236-2 11/4 73.0 55.6 54.8 0.8636-2 11/2 79.4 58.8 63.5 1.2036-3 2 106.4 69.9 82.6 2.39
6000 lb elbow outlet for 90° long radius elbow, dimensions and weights
Nominal Elbow Size
Outlet SizeDimensions
Weight� �
OD of OutletSocket Weld &
Threaded Buttweld
in mm mm mm - kg/piece36-11/4 1/4 38.1 38.1 31.8
Outside diameter at
bevel matches the outlet
pipe diameter
0.3436-11/4 3/8 38.1 38.1 31.8 0.3436-11/4 1/2 43.6 45.2 35.7 0.3936-2 3/4 54.0 54.4 45.2 0.5736-2 1 73.0 55.6 54.8 1.0036-2 11/4 79.4 58.8 63.5 1.7736-3 11/2 106.4 69.6 82.6 2.80
ThreadedSocket Weld Buttweld
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Low Pressure Threaded Fittings - General This subsection summarises requirements for 150 lb low pressure (LP) threaded fittingsas defined in BS 1740 : Part 1 : 1971 (as confirmed October 1983) - Wrought steel pipefittings (screwed BSP thread). Dimensions and tolerances are reproduced in the followingpages. Stainless steel low pressure threaded fittings are in general accordance with thesedimensions and tolerances.
Dimensions and TolerancesBS 1740 dimensions are as detailed in the following pages. Length tolerances are as specified below.
Threading RequirementsFittings manufactured to BS 1740 are threaded in accordance with BS 21:1985, Pipe threads for tubes andfittings where pressure-tight joints are made on the threads (metric dimensions). Summary dimensions areincluded below. For further information on BS 21 threads see page 10-10.
BS 1740 Tolerances
NPS Length of Socket Unions Length or Centre to Face Tolerances for Other Fittings
±mm ±mm<25 6 1.5
25 to 40 6 3.0>40 to 65 10 4.5>65 to 75 12 6.0>75 to 110 16 ->75 to 150 - 8.0
>150 - 10.0
Internal parallel and external taper thread
Nominal Size of Outlet
Minimum Outside Diameter
Minimum Outside Diameter of Body Behind External Thread
Minimum Inside Diameter of Body Behind Internal Thread
� � �
in mm mm mm mm1/8 6 15.0 9.8 8.61/4 8 18.5 13.3 11.43/8 10 22.0 16.8 15.01/2 15 27.0 21.1 18.63/4 20 32.5 26.6 24.11 25 39.5 33.4 30.3
11/4 32 49.0 42.1 39.011/2 40 56.0 48.0 44.82 50 68.0 59.8 56.7
21/2 65 84.0 75.4 72.23 80 98.0 88.1 84.94 100 124.0 113.3 110.15 125 151.0 138.7 135.56 150 178.0 164.1 160.9
Internal Parallel Thread (Rp) External Taper Thread (R)
Socket Weld and Threaded Fittings
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Equal Elbows, Tees and Crosses - BS 1740
Threaded equal 90°elbow, tee and cross dimensions (BS 1740:Part 1)
Nominal Size of OutletsCentre to Face
�
in mm mm1/8 6 161/4 8 223/8 10 251/2 15 323/4 20 351 25 43
11/4 32 5111/2 40 522 50 64
21/2 65 763 80 894 100 1155 125 1406 150 160
Threaded equal 45° equal elbow dimensions (BS 1740:Part 1)
Nominal Size of OutletsCentre to Face
�
in mm mm3/8 10 191/2 15 223/4 20 271 25 33
11/4 32 3811/2 40 442 50 51
Equal Elbow Equal Tee Cross Equal Equal 45° Elbow
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Elbows - BS 1740
Note1 Non-prefered size. The use of these sizes should be avoided.
Threaded equal elbows, male and female dimensions (BS 1740:Part 1)
Nominal Size of OutletsCentre to face, min Bore of Male
End minBore of Male
End max� �
in mm mm mm mm mm1/4 8 19 27 6.5 8.03/8 10 21 29 8.5 10.51/2 15 25 35 11.5 13.03/4 20 30 40 18.0 21.01 25 37 46 24.0 26.0
11/4 32 43 54 30.0 32.011/2 40 49 57 37.0 39.02 50 59 70 48.0 51.0
21/2 65 68 83 62.0 66.03 80 81 94 75.0 79.04 100 100 115 97.0 104.0
Threaded reducing elbow dimensions (BS 1740:Part 1)
Nominal Size of Outlets(1 x 2)
Centre to Face, min� �
in mm mm mm1/2 x 3/4 15 x 8 25 321/2 x 3/8 15 x 10 27 32
3/4 x 3/8 1 20 x 101 29 353/4 x 1/2 20 x 15 32 351 x 1/2 25 x 15 35 431 x 3/4 25 x 20 38 43
11/4 x 1/2 1 32 x 151 38 5111/4 x 3/4 32 x 20 41 5111/4 x 1 32 x 25 44 5111/2 x 3/4 40 x 20 41 5211/2 x 1 40 x 25 44 52
11/2 x 11/4 40 x 32 49 522 x 3/4 1 50 x 201 44 64
2 x 1 50 x 25 48 642 x 11/4 50 x 32 52 642 x 11/2 50 x 40 56 64
Reducing Elbows
Note- These may also be referred to as Street Elbows
Equal Elbows, Male and Female
Socket Weld and Threaded Fittings
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Increasing and Reducing Tees - BS 1740
Threaded tee, increasing on branch, dimensions (BS 1740:Part 1)
Nominal Size of Outlets(1 x 2)
Centre to Facemin
� �
in mm mm mm3/8 x 1/2 10 x 15 32 271/2 x 3/4 15 x 20 35 321/2 x 1 15 x 25 43 353/4 x 1 20 x 25 43 381 x 11/4 25 x 32 51 441 x 11/2 25 x 40 52 44
11/4 x 11/2 32 x 40 52 4911/2 x 2 40 x 50 64 562 x 21/2 50 x 65 76 672 x 3 50 x 80 89 73
Threaded tee, reducing on branch and/or run, dimensions (BS 1740:Part 1)
Nominal Size of Outlets(1 x 2 x 3)
Centre to Face min
� �
in mm mm mm3/4 x 1/2 x 1/2 20 x 15 x 15 32 353/4 x 1/2 x 3/4 20 x 15 x 20 35 351 x 3/4 x 1/2 25 x 20 x 15 35 431 x 3/4 x 3/4 25 x 20 x 20 38 431 x 3/4 x 1 25 x 20 x 25 43 43
11/4 x 1 x 3/4 32 x 25 x 20 41 5111/4 x 1 x 1 32 x 25 x 25 44 51
11/4 x 1 x 11/4 32 x 25 x 32 51 5111/2 x 1 x 1 40 x 25 x 25 44 52
Increasing on the Branch Tee Reducing on the Run and Branch Tee
Reducing on the Run Only Tee
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Reducing Tees - BS 1740
Note1 Non-prefered size. The use of these sizes should be avoided.
Reducing on the Branch Tee
Reducing tee dimensions (BS 1740:Part 1)
Nominal Size of Outlets(1 x 2)
Centre to Face, min� �
in mm mm mm3/8 x 1/4 10 x 8 22 241/2 x 1/4 15 x 8 25 321/2 x 3/8 15 x 10 27 323/4 x 1/4 20 x 8 27 353/4 x 3/8 20 x 10 29 353/4 x 1/2 20 x 15 32 351 x 1/4 1 25 x 81 30 431 x 3/8 1 25 x 101 32 431 x 1/2 25 x 15 35 431 x 3/4 25 x 20 38 43
11/4 x 1/2 32 x 15 38 5111/4 x 3/4 32 x 20 41 5111/4 x 1 32 x 25 44 51
11/2 x 1/2 1 40 x 151 38 5211/2 x 3/4 40 x 20 41 5211/2 x 1 40 x 25 44 52
11/2 x 11/4 40 x 32 49 522 x 1/2 1 50 x 151 41 642 x 3/4 1 50 x 201 44 64
2 x 1 50 x 25 48 642 x 11/4 50 x 32 52 642 x 11/2 50 x 40 56 6421/2 x 1 65 x 25 54 76
21/2 x 11/2 65 x 40 60 7621/2 x 2 65 x 50 67 763 x 1 80 x 25 60 89
3 x 11/4 80 x 32 64 893 x 11/2 80 x 40 67 893 x 2 80 x 50 73 89
3 x 21/2 80 x 65 79 894 x 11/2 100 x 40 76 1154 x 2 100 x 50 83 1154 x 3 100 x 80 95 1156 x 3 150 x 80 120 1606 x 4 150 x 100 135 160
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Sockets - BS 1740
Note- The backnut is used with the faced socket for long screws.
Equal socket, half socket, faced socket and backnut dimensions (BS1740:Part 1)
Nominal Size of Outlets
Outside Diameter
min
Standard Socket Length
min
Half Socket Length
min
Faced Socket Length
min
Backnut Width Across Flats
Backnut Thickness
� � � � �
Minimum Tolerancein mm mm mm mm mm mm mm mm1/8 6 15.0 19 8 17 17.0 6.5 +1.51/4 8 18.5 27 11 25 19.0 6.5 +1.53/8 10 22.0 28 12 25 24.0 7.0 +1.51/2 15 27.0 37 16 35 30.0 8.0 +1.53/4 20 32.5 39 19 37 36.0 9.0 +1.51 25 39.5 46 21 43 41.0 9.5 +1.5
11/4 32 49.0 51 25 48 50.0 11.0 +1.511/2 40 56.0 51 25 48 60.0 12.0 +1.52 50 68.0 60 28 57 70.0 13.0 +1.5
21/2 65 84.0 69 30 65 90.0 17.0 +3.03 80 98.0 75 35 71 100.0 21.0 +3.04 100 124.0 87 40 84 130.0 22.0 +3.05 125 151.0 96 44 92 160.0 24.0 +3.06 150 178.0 96 44 92 190.0 25.0 +3.0
Standard Socket Half Socket Faced Socket for Longscrews Backnut
7-32
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Sockets - BS 1740
Reducing socket dimensions (BS1740:Part 1)
Nominal Size of Outlets(1 x 2)
Centre to Face min�
in mm mm1/4 x 1/8 8 x 6 253/8 x 1/8 10 x 6 303/8 x 1/4 10 x 8 291/2 x 1/8 15 x 6 411/2 x 1/4 15 x 8 401/2 x 3/8 15 x 10 383/4 x 1/4 20 x 8 443/4 x 3/8 20 x 10 433/4 x 1/2 20 x 15 411 x 1/4 25 x 8 541 x 3/8 25 x 10 521 x 1/2 25 x 15 511 x 3/4 25 x 20 49
11/4 x 3/8 32 x 10 60
Reducing Socket
11/4 x 1/2 32 x 15 5911/4 x 3/4 32 x 20 5711/4 x 1 32 x 25 5611/2 x 1/2 40 x 15 6511/2 x 3/4 40 x 20 6411/2 x 1 40 x 25 62
11/2 x 11/4 40 x 32 602 x 1/2 50 x 15 702 x 3/4 50 x 20 682 x 1 50 x 25 67
2 x 11/4 50 x 32 652 x 11/2 50 x 40 6421/2 x 1 65 x 25 76
21/2 x 11/4 65 x 32 7521/2 x 11/2 65 x 40 7321/2 x 2 65 x 50 713 x 1 80 x 25 86
3 x 11/4 80 x 32 843 x 11/2 80 x 40 833 x 2 80 x 50 81
3 x 21/2 80 x 65 794 x 11/2 100 x 40 1054 x 2 100 x 50 100
4 x 21/2 100 x 65 1004 x 3 100 x 80 985 x 3 125 x 80 1155 x 4 125 x 100 1156 x 3 150 x 80 1406 x 4 150 x 100 140
Reducing socket dimensions (BS1740:Part 1) (Continued)
Nominal Size of Outlets(1 x 2)
Centre to Face min�
in mm mm
Socket Union
Socket unions dimensions (BS 1740:Part 1)
Nominal Size of OutletLength
min�
in mm mm1/8 6 381/4 8 443/8 10 511/2 15 573/4 20 671 25 76
11/4 32 8511/2 40 1002 50 110
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Caps and Plugs - BS 1740
Note* This dimension is to be not less than the fitting allowance in BS 21 (see page 10-10).- Plugs in sizes 25 to 150 may be solid or hollow. The purchaser should stated which is required on the order.
Cap dimensions (BS 1740:Part 1)
Nominal SizeLength
minThickness
min�
in mm mm mm1/8 6 19 3.5
Flat Cap Dome Cap
1/4 8 24 3.53/8 10 27 3.51/2 15 37 4.03/4 20 38 4.01 25 44 4.5
11/4 32 51 5.011/2 40 54 5.52 50 60 6.0
21/2 65 67 6.03 80 73 7.04 100 86 7.05 125 98 7.56 150 98 8.5
Cap dimensions (BS 1740:Part 1) (Continued)
Nominal SizeLength
minThickness
min�
in mm mm mm
PlugsPlug dimensions (BS 1740:Part 1)
Nominal Size
Length of Thread for
Basic Guage
Length, min
Effective Height of Square,
min
Size of Square,approx
Internal Diameter,
max
Thickness of Metal,
min
Fitting Allowance in BS 21
� � � � � �
in mm mm mm mm mm mm turns1/8 6 6.5 6 6 - - 23/41/4 8 9.7 6 9 - - 23/43/8 10 10.1 10 11 - - 23/41/2 15 13.2 10 13 - - 23/43/4 20 14.5 12 14 - - 23/41 25 16.8 12 17 22 4 23/4
11/4 32 19.1 16 22 31 5 23/411/2 40 19.1 16 27 33 5 23/42 50 23.4 19 32 48 5 31/4
21/2 65 26.7 19 37 62 6 43 80 29.8 22 37 73 8 44 100 35.8 25 46 97 10 41/25 125 40.1 29 51 120 12 56 150 40.1 32 60 145 12 5
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Hexagonal Bushes and Nipples - BS 1740
Hexagonal bush dimensions (BS 1740:Part 1)
Nominal Size
Minimum Length of External Thread for Basic Gauge Length plus Die Clearance,
min
Thickness of Hexagon
Overall Lengthmin
Width Across Flats of Hexagon
� � �
in mm mm mm mm mm1/4 8 12.5 6 18.5 14.03/8 10 12.5 8 20.5 17.01/2 15 17.5 8 25.5 22.03/4 20 19.0 10 29.0 27.01 25 21.0 10 31.0 36.0
11/4 32 24.0 11 35.0 46.011/2 40 24.0 13 37.0 50.02 50 27.0 14 41.0 60.0
21/2 65 32.0 16 48.0 78.03 80 35.0 19 54.0 90.04 100 40.0 22 62.0 115.05 125 45.0 25 70.0 140.06 150 45.0 25 70.0 166.0
Hexagonal nipple dimensions (BS 1740:Part 1)
Nominal size
Minimum Length of
External Thread for Basic Gauge Length plus Die Clearance, min
Thickness of Hexagon
Overall Length min
Diameter of Boremax
Width Across Flats of
Hexagon
� � � �
in mm mm mm mm mm mm1/8 6 9.5 6 25 5.5 12.01/4 8 12.5 6 31 6.5 14.03/8 10 12.5 8 33 9.5 17.01/2 15 17.5 8 43 12.5 22.03/4 20 19.0 10 48 19.0 27.01 25 21.0 10 52 25.0 36.0
11/4 32 24.0 11 59 32.0 46.011/2 40 24.0 13 61 38.0 50.02 50 27.0 14 68 51.0 60.0
21/2 65 32.0 16 80 64.0 78.03 80 35.0 19 89 76.0 90.04 100 40.0 22 102 100.0 115.05 125 45.0 25 115 125.0 140.06 150 45.0 25 115 150.0 166.0
Hexagonal Bushes Hexagonal Nipple