IFI i FASTENER IDENTIFICATION MARKINGon Fasteners, International Organization for Stan-dardization). The majority of the member coun-tries agreed that publication of an internationallisting of manufacturer markings would be a sig-nificant contribution and USA was invited to bethe custodian. As a first submittal, the EuropeanIndustrial Fasteners Institute published, in 1983, acompilation of the marking symbols used by thefastener manufacturers in 12 European countries.IFI, in conjunction with FASTENER TECHNOLOGY,

TECHDATA

worked on an updating of its IFI-122 realeased inearly 1987.

In 1987, The American Society of Mechan-ical Engineers accepted responsibility to collect,collate and publish a listing of world-wide fastenermanufacturer markings. In July 1987 ASME pub-lished a first edition of "A Guide to the Markingsof Fastener Manufacturers" and it plans to up-

Table 2 Grade Identification Markings for Popular Grades of Carbon Steel Externally Threaded Fasteners

Proof Tensile Hardness

Identificat.on Specification MaterialNominal Size Load Strength Rockwell See

Marking In. Stressk9lMinksi Min Max

Note

SAE J429 - Grade 1 1/4 thru 1+/2 33 60 B70 8100

(DSAE J429 - Grade 2 Low or Medium

+/4 thru 3/aover 3A thru 11/2

5 533

7460

B80870

8100B100

ASTM A307 - Grade ACarbon Steel +/a thru 4 - 60 B69 B100

NO MARK ASTM A307 - Grade B +/a thru 4 - 60 min B69 895- 100 max

SAE J429 - Grade 5 Medium Carbon Steel , +/a thru 1 '; 85 120 C25 C34ASTM A449 - Type 1 Quenched and over 1 thru ...1/2 74 105 C19 C30

ASTM A449 - Type 1 Tempered over 11/2 thru 3 55 90 183 235 3

Low or Medium Carbon' SAE J429 - Grade 5.1 Steel, Quenched and No: 6 thru Vs 85 120 C25 C40 4

Tempered

f SAE J429 - Grade 5.2 Low Carbon Martensite C26 C36Steel

ASTM A449 - Type 2 Tempered C25 C34

Medium Carbon Steel, .A325 ASTM A325 - Type 1 Quenched and 5

Tempered -.

A325 ASTM A325 - Type 2Low Carbon MartensiteSteel, Quenched and V2 thru 1

ov r 1 to 1+/8574

120105

C24C19

C35C31Tempered e 2

Atmospheric Corrosion

g325

)

ASTM A325 - Type 3 Resistant Steel,6Quenched and

Tempered

M-73

rEMNOLD= FASTENER IDENTIFICATION MARKING

Table 2 (CondnUed)

D

IR

Prod Tensile HardnessGrade

Identification Specification materialNominal gin Lood Strength Rockwo

-Sea

In. Stress Min NotsMarking kel kel Min I Max

Medium Carbon

ASTM A354 - Grade SCAlloy Steel, W thru 2% 105 125 C26 C35

Quenched and over 2% thru 4 95 115 C22 C33Tempered

SAE J429 - Grade 8 Medium Carbon thru 1% 120 150 C33 C39-

ASTM A354 - Grade SDAlloy Steel, Quenched

and TemperedV4 thru 2%

over 2% thru 4120105

150140

C33C31

C39C39

7

Low Carbon MartensiteSAE J429 - Srade 8.2 Steel, Quench9d V4 thru 1 120 ISO C33 C39

and Tempered

ASTM A490 -. -Type 1Medium Carbon Alloy

Steel, Quenched % thru 1% 120150 min170 max C38

and Tempered

ASTM A490 - Type 2Low Carbon Marlensite

Steel. Quenched % thru 1 12'0150 min170 max

C33 cm

and Tempered

Atmospheric Corrosion

ASTM A490 - Type 3Resistant Steel,Quenched and

I/k thru 1 % 120150 min170 max

C33 C36 6

Tempered

see 11 2 8I I

,Note

NOTES:

1. In addition to the indicated grade marking, all grades Included in this Table must be marked for manufacturer Identification.

2. While hex heads are shown, grade markings apply equally to products with other head configurations.

3. Hardnesses are Brinell Hardness Numbers.

4. Grade &I Is a popular grade for some, see page J-&

L A325 Type I bolts may also be marked with 3 radial lines 1200 apart in addition to the A325 marking.

6. The bolt manufacturer, at his option, may add other markings to indicate the use of atmospheric corrosion resistant steel.

7. A354 Grade BID products, In sizes 1% in. and smaller, am identified as shown and, at the manufacturer's option, may have the letters80 added. Larger sizes are marked only 1313.

L Specifications -SAE J429 - Mechanical and Material Requirements for Externally Threaded Fasteners, page B-50.

ASTM A307 - Carbon Steel Externally Threaded Standard Fasteners, page B-511

ASTM A449 - Quenched and Tempered Steel Bolts and Studs, page B-65.

ASTM A325 - High Strength Bolts for Structural Steel Joints. page E-11.

ASTM A354 - Quenched and Tempered Alloy Steel Bolts, Studs, and Other Externally Threaded Fasteners, page B-68.

ASTM A491) -.Heat Treated Steel Structural Bolts, 150 kei Minimum Tensile Strength, page E-1&

'21,

'91 07/04 e9133 a 65 7437122 AGLOW GRP OF COS

p 4i f (./V 5'

Specified Materials and Mechanical Propertiest .

Mechanical PropertiesId if l i

Description specificationent cot onGrade Mork Motlarlal Proof Load H ardness

fRockwell)

HeavyASTM A104

*

AISI 1045 160,000 9 84 minOrsdo 2 0 Finished

2 1 35,000

Cabon and Alloy ASTM A19414

Steel Nuts for Bolts Grods 2H0

AISI 1045

for High-Pressure

and High-Temperature

Service Carbon. HeavyASTM A104

Molybdenum 175,000 024-38Grade 4

Stew Finished150,000

ASTIVI A104

Grade 77

AISI 4140

Suitable Nuts for High-

Strength Structural ASTM A325Medium Carbon

0 79 min

BoltsSteel 144,000

C 37 max.

5/6 thru I

SAE J995

0

Medium CarbonUNC UNP120,000 109,000 0 32 mox

Steel Nuts for Grade 5 Steel ow I thru 1-3/8VNC UNII

.

Chanical and Quality 105,000 94,000

Requirement 5/8 C24 32

SAE J996

Grade 6

0

@

Medium Carbon

Steel

Over 6/8 thru I

1501140 C26 - 34

Over I thru 1-3/8

I C26 - 30

t ) 1,,,. -1 H t) ity, -T Me %4

WMPACTOAdWQ

on method (MetrIO UNDRAKO method (metric)

W.M1 0 screws grade 8.8 3-M1 0 scivws V ied@ 12.9

640 We Yield I 170 MPA YI*Jd

5 x 540 1 79 3x M 01111

11W 1000

iS8 KN max. load 204 KN max. load

C ommon method (Inch) UN111RAK0 method Onch)

6 318 WNC sumvits 9turJos 5

85 K SI Yield

5 x 85000 x .0773

, 33000 lbf max. load

Common Method Onah)

3 318 UNC vet"i 190 K61 12 314 UNC gicruvis grade b

170 KSI Yield 05 K8I Yield

3 x 170000 x .07 76 Total Strength

a 39600 lbi MaX. load .. 340700 lbf max,

UNDRAKO method ImOdal

to-M20 $growl rode 12.9

1196 MP& Ylold

Total Sjrvn2jh a

4410 KN

U NIRAKO method (Inah)

16 314 VNC screw# 180 KSI

162 KSI YieldTotal Strength

, $55700 lbf max.

COMPARATIVE TENSILE STRENGTHS

Metric series

ISO

I

120 KS1 i 1190' Kill

150 K81 1

190' KSI

t Up to M10 - (1250 We over M106) 'Up to 71150 - (160 K61 over 71180)

Shear Strength and Location Advantages

58%

27%

U NBRAKO screw% provide Increased shear strenoths over high tensile hex head screws by some % aPplicable to Writ tensile

UND RAKO SCrows cat) hin located licutur it) adjactint parts/tui faces, shice wtunch cladrance (opplicable to hex Ileads) notrelevant to UNBRAKO socket screws.

strength

I600 We 1300 M Pat 63% a

11000 MPa 1300 M Pat 30% 1 a

Inch Series

UNSAAKO lixtra UNBRAKO M UNBRAKO bitik UNSRAKOt rong, alreltol TV Wadi& Rliranath

Benefits of extra strength

W 04 t ov c- #1 '7 1 Al " WK - ** *M#M (APVYwr

Clearance for wfench I No wrench dittraneo n6oossam I

Common Method (Metric)

1 2-M20 screws giode 13.8

640 We Yield

Total Strength

1 882 KN

Afti, A

" '*.tD tNfEN,SI"O.NS:.QF,;UN.IFIED,PREC1S10_N`.HEXAGUN .HEAD:HIGH

4 ''

..:'3 N

... .,.,. .yJy

z .

. "Y" .'a . _.. t' :

;211;x :207;;:

,' _s..t. aMeii:--: .;n,:f0,:,750':.,:...

;;

0243 :.; 0 233:aw

' .L y[

>.,.,: ,. "2:.

: :Min:..

,..Q;27.1 .

'r:0.2613125 7

! 0 3750.;k-'.037, 5

0.'4375;`.^ X4335 , "

4:4 37":043

X0 562.' 0 X554"'

0-.687-z`x:;$79 '

x;1 X312 .?y1 .300 '... .

y '

s;('j,.'" '

;a,6;.

.

"3. "2'3'n- ."- ''2

IVk' G j n.

\....... ..,.w.,.......r........"... a a.1:...,.......r.................".._ ...a....._...:."r..s.....`......a"...-wwt.aatii..."_...a..x....._..,.....,.i.}. . .r ....7.....".. . ...y:i`: '.'. }'..:'.`.w....

?:' Via,i i+:

.

' :r

t1UR t30i"(S fi1LiY 11EET THE Ti^.'L! Oti"^:C iuFW KNCt STRICT ii S R(.(ltil;;EhiFNTS

T he Japan Hlgh-Strength Bolt Export

Association offers a complete selectiotT

of 1 % 2"" to 1-1 2"" diameter bolts.

Orders will be acted upon immediately

and quality is guaranteed to meet all

specifications of ASTM A-325 (Type

1; 2, 3) and A-490. Written certifi-

cation to this effect will be promptly- f

pr(wided upon request.

F3olt nFrkrny

.

I jr1 l

"::LT ; ?J'riHr ; ". ri

j

Manufacturer'sidentjfrcation s ymbol

r JIF!,i M /!Y LSF- v JAiIfF'" Fr1%rtj i "s

IW jai ()!( lJnlJlil f CHAR1F I: Eir %: IFJ luJ

NEW HIGH-STRENGTH BOLT SPECIFICATIONS

Tensile

N ominalbolts

Bolt Ormensions"in inches

Heavy HexagonStructural Bolts

across 'He;ght. length,

flats. F T

1 /2 7 .8 5 16 1

5 %8 1 1 : 16 25 '64 1 1143 r4 1 1 '4 15 32 1 3/8

7'8 1 7.16 35,64 1 112

1 1 5 8 39.64 1 3.'4

118 113.16 1116 21 1 .4 2 25 32 2

1 3 8 2 3!16 27 32 2 114

1 1.2 2 3'8 15 16 2 1;4

B olt Size To determine required bolt

(in.) length add to grip' (in.)

1 2 1 1,16

5 ; 8 7.'8

3 4 1

7;8 1 1.'8

1 1 1 4

1 1'8 1 1!2

1 5:8

1 3 '4

1 1'2 '" 1 7.8

Nut Dimensions.in inches

Heavy SemifinishedHexagon Nuts

W idthacross

f lats. W

HeiRht"H

7 .'8 31 i641 1.'16 391641 li4 47/641 7116 551641 5,'8 63.'641 13!16 1 7;642 1 7/322 3.'16 1 11 / 822 3'8 1 15132

" Exclusive washers

" TFre IenRth determined by the use of

table above should be adjusted to the

next longer 1.4 inch.

Bolt Srze

Bolt Tension

M inimum Bolt Tension'

(in.) (Ib)

1.2 12.050

g "8 19.200

3 4 28.400

7j8 39.250

1 51.500

1 lib 50.450

1 1 '4 71.700

1 3 g 85.450

1 1.2 -, loa.eao

i+ _+.r. "

Requirements for Full Size Bolts

B olt Srze Threads per ; Strrsti Area'"Inch and Series yq rn.D eyrjgnation

C olumn 1

1 12.13 UNC"""""""""""5r8-11 UNC""""""""""3 14.10 U NC""""""""" "7/8. 9 UNC"""""-""""""

1.8 UNC ...............

1 1 18.7 UNC """""""""1 1 .'88 U N """"""""""""1 1 :'47 UNC """""""-

1 1 .4.8 UN """ """""

1 3:8.6 UNC """"" "

1 3 8.8 UN ""-""""

1 1'2.6 UNC " """""1 1!2.8 UN """"" """""

Codnnrt 2

0.142

o -zzfi0 .334

0.462

0 .6060.7630.7900 .969

1.000

1 .1551 .233

1.405

1.49?

74 000 77 000- 85 450 88 950 .91 250 94 950

1 04 000 108 200

1 10 400 1 14 900

( a' The stress area is calculated as follows

A =0.7854 D-0.9743,-I n

i bt Loads tabulated are based on the followin(;.

Bolt Srze

w here: A-=stress area,

D =nominal bolt Srze. and

n -threads per inch.

Column 3 Column 4 Column 5

1 /2 to 1 inch;:""""""""" , 120000 psi ; 85000 psi 88000 psir

1 1/8 to 1 1/2 inch''- I 105000 psi ' 74000 psi ; 77000 psi

Proof Load and Hardness Requirements for Nuts

N ut Size. Threads per proof Load"Inch. and Series ruin' Ib.,

DesrKnation

1:2.13 UNC"""""""""""

5't311 IjNC"""""" """""""

3 4;10 U NC"""""""""7 8.9 UNC: ........"..."..

1.8 UNC ..................

1 1.'87 UNC """""""""

1 1:8.8 UN "..............

1 1:4.7 UNC ..........."

1 1 .""4-8 UN ."...........".

1 3'86 UNC ""-""""""1 3 X8.8 UN """""""""""

1 112.6 UNC """""""""1 l i2.8 U N """"""-"""""""

20 d5032 550as Ino66 550

T ensile Load''nnn. Ib

Proof Load" min' Ibr"

L ength Yield StrengthMeasurement - Method "0.2 per

" Method cent Offset'.

Column 3 Column 4 Column 5'

1 7 050

z71uo40 10055 450

S tandardN UT MARKING

,. lr . ..Fa. .,r,

I 1; j tii

1 2 050 12 50019 200 19 9002 8 400 29 400

39 250 40 650

72 700 51 500 53 30080 100 56 450 58 75082 950 I 58 450 60 850

I O1 700 71 700 74 600

1 05 000

121 300

1 29 500147 500156 700

B rinellHardness,

m in max

8 7 250 """

109 9UU "

113 800 """

1 39 500 143

144 000 143166 300 1431 77600 143 '

202 300 143 I2 14 800 143 I

352352352352

352352352352

3$2352352352352

E qual to the proof load of bolt ,length

measurement method given in ASTM ra' Based on 144,000 psi on stress a rea of test mandrel or

A 325. test bolt. '

.8r.q2 q OW" - -, - -- ii6 '- -' -' -088'1114',j -9587.. `i

3 "A 5

0",A-4-

4A0,tz"&

1 --v

'i4dGkN Bolis'&.Nuis UnitS tandard Bait & Nut Division, P.O. Box 12. Kinqs Hill. WEDNESBURY, West Midlands. WS1 0 7SJ H T. D.'I 0! 7 4

i

I

II!,

4 -,.,

-fili

.w

*W."

fa0-WcuEco

I . - .. _. Z . ... ... . .. . . .o riginally developed for the structuraltrade but are becoming increasinglyused in general engineering applica-tions. The basic principle of the highstrength friction grip bolt is that whenproperly tightened, the bolt develops

GKN load indicating bolt (Lib*)It is now established as the first choiceof both designers and erectors.

is because torque-tension relation-s vary considerably according to

tMe condition and finish of the boltsand cannot be relied upon as a measureof bolt tension unless repeated cali-brations are carried out.The. GKN load indicating bolt gives areliable, easily read, direct indicationthat it has been tightened correctly,independent of the torque required todo so, while at the same time retainingall the advantages of standard highstrength bolts.To ensure that the minimum requiredtension has been achieved all that isnecessary is to check that the gapsunder the bolt head have been reducedto prevent entry of a simple feelergauge. Experience will in many casesbnable gap closure to be visuallychecked.*Reg. Trade Mark,

U O U11141UHUY mtjit 4,iampmy wice unthe joint to carry the normal workingloads by the friction developed betweenthe contact surfaces.

Standard high strength boltThis is a hexagon head bolt made toBS.4395 from a medium carbon steel,carefully selected for strength andductility. The bolt is used together witha special nut and hardened washer.The strength of the nuts'were chosento make sure it would develop the fullmechanical properties of the bolt with-out thread stripping and the distortionof the nut. The hardened washer isused under the tightening member toprovide a uniform surface for tighten-ing. GKN high strength bolts can alsobe supplied in higher grade material toBS.4395 : Part 2 *.Countersunk high strength friction gripbolts (head dimensions to BS.4933)can be made specially to order.*The use of higher. grade bolts isrestricted to joints subject only toshear. Where joints made with highergrade bolts carry loads in the directionof the bolt axes, bolts with waistedshanks are recommended.

OTHER PRODUCTS MANUFACTURED

Black hexagon head bolts and nutsBlack hexagon head bolts and nutsBlack hexagon head bolts and nutsHigh tensile bolts and screwsAlloy steel stud bolts and nuts for high and 10t temperature serviceOil and rubber-filled Pilgrim systems.Eslok self -locking fasteners.

Forfurther information contact:

BS.916BS.1 769BS.2708BS.1 768BS.4882

oince nign screngm triction grip boitsare tightened to high pre-loads, theyare particularly suitable for applica-tions where severe vibration is presentsuch as gantry cranes, conveyors,quarry sizing screens, railway freightwagons etc.

Higher grade bolts/waisted shank(typeThese bolts are available to specialorder only, in diameters from M16 toM33. For details of dimensions andmechanical properties refer to BS.4395: Part 3.By the provision of waisted shanks, thelimitations imposed on parallel shank,higher grade bolts by low ductility, are-overcome to the extent that the boltsmay be used in joints subject to tensionas well as to shear, and that tighteningby the part-turn method becomesappropriate.Attention is drawn to the importanceof ensuring that these bolts are correctlyused if satisfactory results are to beobtained. Recommendations givingguidance in the use of this form offastener are given in BS.4604 : Part 3.

F or further details on highstrength bolting, please refer toour separate brochure coveringthese bolts.

Ek 12 li"01ts & nuts LimitedS tandard Bolt and Nut Division, P.O. Box 12, Kings Hill, WEDN ESB UF3Y, West Midlands, WS1 0 7SJTel. No. 021 -556 1991 Telex. 339511

ISOIBM74

' 30 Metric threads *i reads for ISO metric bolts,:rews and nuts.Vis the official ISO recommendedr ISO metric threads.

In practice crests of boltsmay be rounded inside themax. outline.

r90.

Max. Minor dia. specified

M ax. Minor dia. at intersection of rootcontour andflank of thread

Min. Major dia specified

In practice the root isrounded and clearedbeyond a width of P/8

lesign form of ISO metric thread. Design form of ISO metric thread.

lasses of f it for ISO Metric screw threads to BS 3643

Free Fit Medium Fit Close Fit

NUTS 7H 6H 5H

LBOLTS 8g 6g 4h

ie bolt and nut industry have decided metric coarse threads will be manu- The use of metric fine threads are notter consultation with user organis- factured for stock. recommended, and should be limitedions, that only fasteners with ISO to special applications only.

;TANDARDSritish and corresponding German standards for fasteners

P roduct B.S. DIN Remarks

Precision Hexagon Head Bolts 3692 931 Completely interchangeable

Precision Hexagon Head Screws 3692 933 Completely interchangeable

Precision Hexagon Nuts 3692 934 Completely interchangeable

Black Hexagon Head Bolts 4190 601 Completely interchangeable

Black Hexagon Head Screws 4190 558 Completely interchangeable

Black Hexagon Nuts 4190 555 Completely interchangeable

Cup Square Bolts 4933 603 Boltsto DIN 603 havelargerheads

High Strength Bolts (general grad e

_

4395 Part 1 - No German equivalent

High Strength Bolts (higher grade) T439 14 Bolts to DIN 6914 have shorter length of thread

Threads to BS,3643 Part 2.

Class of fit: Nuts 7H, Bolts 8g.

3 ,603-00

4-754-00

S hortestbolt

Up to and i

ead to neck1824

a d to neck222841

Over 75-125Over'125-200Over 200

The GKN foundation bolt gives a rigidand permanent anchorage to walls andfloors, The disposition of the angularfaces on the indented portion of thebolt enables it to withstand high pullout loads when embedded. Standardbolts are made in steel Grade 4-6 butbolts in non -ferrous metals and stainlesssteels can be supplied to special order.For high shear applications, indentedfoundation bolts can be supplied in.high tensile steels. They can also besupplied spun galvanised or with anyother protective finishes. Bolts aresupplied with hexagon nuts to BS.4190Grade 4.

6073

B olts are supplied with hexagon nuts to BS 4190 grade 4

M inimum length whichshould be embedded

in concreteStatic Live Heavy

loads loads vibration

D ia. D 'A' 'B' 'C' B+ B + B+1 12D 3D 4D

M6 12 30 15 39 48 54

M8 16 40 20 52 64 72

M10 20 50 25 65 80 90

_i71 2 24 60 30 78 96 108

M16 32 80 40 104 128 144

M20 40 100 50 130 160 180

M24 48 120 60 156 192 216

M30 60 150 75 195 240 270

M36 72 180 90 234 288 324

InstallationThe best results are obtained when thebolts are placed in position when theconcrete is laid, When this is not alwayspracticable, for example, when boltsare to be fixed to existing walls orfloors, a hole should be made 6-10 mmlarger than the diameter of the indentedportion of the bolt and not less than10 mm deeper than the portion to be,embedded. The prepared grouting mix-ture should then be poured into thehole and the bolt inserted. The top ofthe bolt should be tapped lightly whilstrotating it to exclude any trapped air.It is important that the grouting com-pound is allowed to set thoroughlybefore the bolt is loaded.

h which

should be embeddedin concrete

Static Live Heavy

loads loads vibration

ShortestD 1 a. D B -' B - B - bolt

length 1 1D 3 D 4D length

5 0 M16 32 64 32 88 112 128 100

65 M20 40 80 40 110 140 160 130

80

100

130

160

190

M INIMUM BREAKING LOADS

DIA. M8 M10M1 6 M20 M24 M30 M36

kN 14-4 22-7 33-1 61-6 96-1 138 220 321

240

280 P roviding the bolt is correctly installed,at the recommended depth and with asuitable non-shrink grout, it will frac-ture before being pulled out. The tableabove gives the maximum loads thebolt will withstand but variations ingrouting could result in the bolt beingpulled out before flacture.

and nuts t0 BS 3892 Grade 8.8D

A

"8 .8 L JlI Length of thread l \

D imensions in Millimetres

Pitch of A B C D ShortestDia Thread Width A/F Thickness Thickness Shank Bolt

ISO Bolt Heads of Bolt of Nuts Diameter Length Length of ThreadCoarse and Nuts Heads (Preferred)

M5 0.80 max. 8.0 3.65 4.00 5.00 20 .min. 7.85 3.35 3.70 4.82

M6 1.00 max. 10.0 4.15 5.00 6.00 25 Up to 125 mm long- 2 Dia + 6 mmmin. 9.78 3.85 4.70 5.82

M8 1.25 max. 13.0 5.65 6.50 8.00 30 Over 125 mm up to 200 mm long- 2 Dia -I- 12 mmmin. 12.73 5.35 6.14 7.78

M10 1.50 max. 17.0 7.18 8.00 10.00 35 Above 200mmlong -2 Dia +25 mmmin. 16.73 6.82 7.64 9.78

,M12 1.75 max. 19.0 8.18 10.00 12.00 40min. 18.67 7.82 9.64 11.73

2.00 max. 24.0 10.18 13.00 16.00 45min. 23.67 9.82 12.57 15.73

2.50 max. 30.0 13.215 16.00 20.00 55min. 29.67 12.785 15.57 19.67 ,

M24 3.00 max. 36.0 15.215 19.00 24.00 65 Threads are to BS.3643 :Part 2.min. 35.38 14.785 18.48 23.67 Class of fit:Nuts 6H,Bolts 6g

IDENTIFICATION MARKING OF GRADE 8.8 BOLTS & GRADE 8 NUTS -H igh tensile precision hexagon headbolts and screws to B S.3692 grade 8.8.Grade 8 nuts are used with grade8.8 bolts.

The marking of the nuts is in the formof a code symbol based on a clock facewith a single dot indicating 12 o'clock.The second mark, a bar, indicates thegrade, i.e. in the case of a Grade 8 nutthe bar is at the 8 o'clock position.The marks on the nuts are indented.

PHYSICAL PROPERTIES OF HIGH TENSILE BOLTS

Grade Minimum Ultimate Tensile Stress (N/mma ) Stress Under Proof Load (N/mms) Recommended Grade of Nut

8.8 785 571 8

, 981 777 12

12.9 1 177 932 12

TORQUE DATATensile PROOF LOAD (kN) APPROXIMATE TORQUE* (Nm)

D iameter StressArea (mm2) Grade

8.8Grade10.9

Grade12.9

Grade8.8

Grade10.9

Grade12.9

M5 14.2 8.1 11.0 13.2 6.90 9.4 11.2

M6 20.1 11.5 15.6 . 18.7 11.70 15.9 19.1

M8 36.6 20.9 ``128.4 34.1 28 38 46.4

M10 58.0 33.1 45.1 54.1 56 77 92

M12 84.3 48.1 65.5 78.6 98 134 160

M16 157 89.6 122 146 244 332 397

M20- 245 --14(3- 190 228 476 646 775

M24 353 201 ' 274 329 822 1 120 I 1 342

*Approximate torque values have been calculated to induce a theoretical bolt load equal to 85% of the proof load.

1z

roof Load(kN)

Threads to BS.3643 Part2.

Class of fit: Nuts 7H, Bolts 8g

N FBlack hexagon head bolts and screwsto BS.41 90 grade 4-6.

HY ICAL PROPERTI

G rade 4 nuts for use with grade 4-6bolts. Grade 4 nuts to BS.4190 are,not normally marked. N.B.-Nuts of ahigher grade may also be fitted.

M inimum Ultimate Tensile Strength (N/mm') Str ss Under Proof Load (N/mm') Recommended Grade of Nut

392 222 4

E

D iameter

0

S

6.

M 16

M24

M30

M36

1

M12

.0

157

M20 1 24

0

7

.8

18-7

mm, up toand including 200 mmlong -2 Dia. +12 mm

mate Torque*(N m)

4-54

11

2

38

34-8 95

54-3 185 1

78-2 320

124 633

181 1110

* The torque figures quoted are approxi!"Nigures quoted have been based on a

m ate and are applicable to fasteners inthe self-colour (unplated) conditiononly. They do not take into accountthe effect of plated finishes, speciallubricants or the effect of hard andsmooth mating surfaces such ashardened washers etc, The torque

theoretical bolt load equal to 85% ofthe proof load of the bolting material.Correct pre-loading of the bolt resiststhe effect of fatigue. Providing that thebolt pre-load is greater than theapplied load, the fatigue life of the boltwill be infinite. I

ALWAYS REMEMBER THAT THEBEST METHOD FOR RETAINING ANUT ON A BOLT IS BY PROPERTIGHTENING.

For advice on tightening problems,contact our Technical Sales Dept.

'hy metric?to metric svstem offers simple and:herent u nits of measurements and. use will simplify design and pro-iction.I the major nations in the world are-eady metric or have metricationogrammes and over 70% of British.ports go to metric countries. Wein not, therefore, continue to manu-cture in imperial and metric dimen-.ms-this can only lead to inefficientid uneconomic use of resources andake us less competitive against those)untries only manufacturing to metricmensions.

ariety reduction'e currently manufacture four imperialBread forms-B.S. Whitworth, B.S.ne, Unified Coarse acid Unified Fine,I of which can be replaced by a single'0 metric coarse thread. A reductionam forty imperial diameters to seven

;'eters in the M6-M24 range and a)nsequent reduction in the length:cre ts. The benefits to both userid , ;, facturer in reduced inventorysts, warehouse costs, distribution:)sts etc., will help the engineeringidustry to remain competitive.

rogramme of changehe fastener industry has agreed rangesf recommended stock sizes which itias felt would meet the majority of,quirements.K N Bolts and Nuts have increasedieir stock range to over 600 sizesnd this range will be constantly under;view to ensure it reflects the require-i ents of the general engineeringidustry.)etails of our stock range are availablen request.

T his further extension to the rangewould make it prohibitive to continueto maintain all the imperial sizescurrently stocked and the followingtimetable of change is being imple-mented.

High tensile precision bolts,screws, and nuts - BS.1083 -B.S.F./B.S.W.These were declared non-preferred onthe 1st January, 1974, and wereremoved from the stock range. Theseproducts will only be manufactured ineconomic quantities and will becomedifficult to obtain and certainly moreexpensive.

Cup square bolts Ft nuts- B.S.W.This range has now been phased outand only metric bolts and nuts areavailable from stock.

Indented foundation bolts andnuts- B.S.W.The imperial range has also beenphased out and only metric bolts andnuts are available from stock.

Black hexagon bolts, screws, andnuts- BS.916- B.S.W.These will be declared non-preferredduring 1975. During this interim periodthose companies who have not yetgone metric should begin to plan andintroduce their change over to metric.The cost of not going metric can onlyincrease, as the bolt and nut industryaccelerate their changeover to metricproducts. The above timetable is inaccordance with the policy of theBritish Bolt, Nut, Screw and RivetFederation.

UnitsIt will be noted that strength gradesare specified in metric 'technical' units(kgf/mm'). This is in accordance withpresent continental practice. How-ever, agreement has now been reachedto use S. I units (N/mm z)- (the correctunit in the coherent S.1 system) and itis hoped such units will eventuallysupercede 'technical' units. S.I unitshave therefore been used. (1 kgf =9.81 Newtons).

Technical serviceWe provide an advisory service backedup by the technical resources of theworlds major fastener manufacturer.

Further informationThis can be obtained from our Tech-nical Sales Department, GKN Bolts andNuts Limited, Standard Bolt and NutDivision, P.O. Box 12, Kings Hill,Wednesbury, West Midlands,WS10 7SJ.

1 u

;zradas o' alloy s-"-ael -"PorStta d-.Bo[tS TO BS 1750 AND ASTM.A 193

GRADE OF BOLTING ANDMARKING SYMBOL

-v

N OTE: h is standard practice to assemble Grade 87 Stvd-bolts with Grade 2H Nuts, Grade ale With Grade 4Nuts and Grade U Stud-bolts with Grade L4 Nms.

ades of harbors aid ahoy steel'` (,t$ TO BS 1750 ANG ASTM.A 194 '

." . rECNANICAI ipltUPERTiEt: ';"t: . . . . .. . . " .._: .. " . . :+- . . . .. .

.. :.,. ';c , .. , _ :, r ,

' Naednosa '.. . '218/162 . ' . - ::' x ." 218/962 - .>-

.. . ' . .} " 22' .."

- . "

t

impact Yalw . " . . . . . . . " ." " ' riimam) ' . ' : ' ' - . - - - _ w " ' - ' IS,n at,=rook) ' . '-' . .

.,.. L.. ... Bolting - "

_{ . . . , , t " . : . -. . . . ,Tosperatun - ' . . Mia Y Max ' . "Min ' 'Max" ." ", " ' ; " Min ' - : Max ;, "" ..

. ' " Ranoa - - . 0C 460C -100C 620C . 100'C 520C " .; . .t

. " . ..

: . " .

. . - - - . - - r",

:Carbon:steel . . alts and.. . .: '.. . . ..uts fo r = .+ . : .. . : .. .

-moderate ' =' .duty service . . .,TO 8S.1750 . " " .

. .. .,

j .

_

`"' "

'

'

" s .

-

_,

' rATERIAL ' ' . ' ' HOIT FORGED ' , COLO FORGEC

..r."-.

Malarial Specification . ' ' , (Ea. 3A. BS.870) (En. 38. BS.870)Chemical C ompositias . % X . %

" Midiam " Mszuoum "- MaximumCatYan . . 0.15 0.25 0.26

' . Siliooa , , " 0.05 0.35 0.36Y wwwwwiu a./11 f1.ef1 .nn

Sulphur' - - ' " 0.080Pboapharos -. ' - 0.080

M ECHANICAL PROPERTIEST ENSILE STRENGTH MinisawW f/in' 'N/mm= . . .Ton frn' 'E tonyation X MinimumRecommended Boitin8Tempxatuts Raaea , "

" 0.0800.080

. :.:::. . {. S

ez no -431.5ZS "Min . "' Max

" np . .

1 7Min Max Tnen s..ew ..

...

a

To meet the needs of the Engineering Industry, rapidly progreschangeover programme, GKN Bolts and Nuts Limited are addi8-8 High Tensile Bolts, Nuts and Screws (to BS 3

5).of ISO-Metric black hexagon bolts, screws and nuISO-Metric High Strength Friction Grip Bolts (to

ISO-Metric threadsThe ISO-Metric thread derives fromthe S.I. (Systeme Internationale)thread which originated as the resultof an international conference inZurich in 1898. This thread wassubsequently modified, the rootradius being increased to improvefatigue strength. The presentandard, BS.3643 has been based on

Ene post-war work of the ISO-Technical Committee ISO/TC 1,Screw threads, and is published inthree parts ; Part I gives particulars ofthe ISO Basic Thread Profile andstandard diameter/pitch combinations,Part 11 limits and tolerances for coarsepitch series threads, and Part III forfine pitch threads.The B.S.I. in its policy statement onscrew threads strongly recommendsthat "BRITISH INDUSTRY SHOULDADOPT THE ISO-METRIC SCREWTHREAD SYSTEM".

neasons for going metricThe Metric system is simple andcoherent, and its use will simplifydesign and production. 75% of theworld's nations use it, 85% of theworld's population live in Metric-ountries, 75% of world trade is,etric and over 60% of British

exports go to Metric countries.Metrication offers important additionalbenefits in the form of componentstandardization and variety reduction,which are particular y important in thefield of screwed fasteners.

Variety reductionThere are live Imperial threads inregular use in the U.K. These can bereplaced by a single ISO-METRICcoarse thread, thus replacing 40 sizesby 7 between diamcters M6 and M24.The resultant economies of storagedistribution and Volume productionwill offset the initial expenses ofchanging to the new system. Not onlyshould designers choose the 1-10-Metric coarse thread but they shouldalls'o "think Metric" and c666sep referred lengths and diametersrather than simply convert from pasthriperial size requirements.

g through itsir range of Grad

manufacturing stock a rangeto BS 4190) and a range of .

Coarse and fine threadsIt is our intention to manufacture forstock, only ISO-Metric coarse threads.This is finer than B.S.W. but not asfine as B.S.F. Its tensile stress area isonly slightly less than that of B.S.F.and in the majority of cases Metriccoarse can be substituted for both.Although there are several validreasons for*specifying a fine threadtheir advantages are outweighed bythose of a coarse one, which isstronger, more robust, provides moreroom for plating, is less affected bycorrosion and high temperature,assembles easier and quicker andeliminates cross threading, Finethreads will therefore only be availableto special order and their usediscouraged if possible.Length of threadThe length of thread for eachdiameter of bolt appears in the chartoverleaf. It will be nct- `_- :ndiameters M1 6-M27 (lengths LID to125 mm) of black bolts to BS.4190the length of thread is reduced to 1 ftimes the fzo!t diameter. This isbecause the shorter thread length isrequired for structural applications.UnitsIt will be noted that strength gradesare specified in Metric "technical"units (kgf/mm'). This is inaccordance with present continentalpractice. However, agreement hasnow bpen reached to use S.I. Units(N/mm2) (the correct unit in thecoherent S.I. system) and it is hopedsuch units will eventually supersede"technical" units. S.I. units havetherefore been added. (1 kgf = 9 -81Newton.)

IdentificationMptric bolts and nuts are marked onthe head (or non bearing face of thenLt). Some users have suggestedtliit ISO Metric products be colouredfcrtmore ready identification.Uirfortunately lacquering or dyeing isnet only expensive but, can lead toadierse tightening characteristics.Tha only acceptable method is zincpliting and yellow chromateprmsivation but this involvesadJitional cost and is neitherrerommended nor recessary.

Ataillability and,serviceGf,N ISO-METRIC fasteners aremiTketed primarily through ouramTedited stockholder network whichoffirs "off the shelf" service.Ths will be Supported by the advisory

and technical resources of thewuld's major fastener manufacturei.

anical properties of ISO metric bolts &

all

scnwsU .T.S.

YtELD ST REEJ

kqf1mml Tonf&2 I haf/mml Tonfifiz50 (SO-&) 64 (4")

GAeml dimensions of ISO metric hch a Can precision bolt g,1cre-inuts.

pi.6a(

th,ead

M SM 6

HJOM, : 2M 4M 16

rl 20'12214W7M 30M33

I

( 0.1le

OSO1 00

1 ,251

2 00 002so2 SO2 so

1 '0

1)1 003.503 So4

D i-ttar .( I Wr.dh la"i"u.th,eadd ac

sn-k Nts ead

max m max mi5 00 4 81 Soo 7BS6 -00 S-82 10 00 9-788 00 7 -78 13,00 12731000 9-78 17 00 16-7312-00 11 73 1 00 18'6714 00 13 73 12-00 216716 00 15-73 24 j,1 2367

18 00 773 27 60 26 67

; 7 3.10 00 9 6 0 00 29 67120 2i 6; 2 00 l 6,t4 00 13.6 6 01) 35 . 3

027 0 .6 10 1 , 0 40 N)0 cc 19 6 7 4 O 4S38)) 00' A 61 50 GO 49,3i

1 A (111 - 411

MM 0 1 2 3 4 5 6 7 8 9

in in in in in in in in in in

0-03937 0-07874 0.11811 0-15748 0-19685 O23622 0-27559 0-31496 0-3543310 0,39370 0-43307 O47244 0-51181 0-55118 0-59055 0-62992 0,66929 O70866 0-7480320 0-78740 0-82677 0-86614 0-90551 0-94488 0-98425 1 02362 1-06299 110236 1-1417330 1-18110 1-22047 1,25984 1-29921 1-33858 1-37795 1-41732 1-45669 1-49606 1-5354340 1,57480 1-61417 1-65354 1-69291 1-73228 1-77165 1-81102 1-85039 1-88976 1-92913

50 1-96850 2-00787 2-04724 2-08661 2-12598 2-16535 2-20472 2-24409 2-28346 2-32283

60 2-36220 2-40157 2-44094 2-48031 2-51969 2-55906 2-59843 2-63780 2,67717 2-7165470 2-75591 2,79528 2M465 2-87402 2-91339 2,95276 2-99213 3-03150 3-07087 3-1102480 3-14961 318898 322835 3-26772 3-30709 3-34646 3,38583 3-42520 3-46457 3-5039490 3-54331 3-58268 3-62205 3-66142 3-70079 3-74016 3-77953 3-81890 3-85827 3-89764

100 3-93701 3-97638 4-01575 4-05512 4-09449 4-13386 4-17323 4-21260 4-25197 4-29134

10 4-33071 437008 4-40945 4-44882 4,48819 4-52756 4-56693 4-60630 4-64567 4,6850420 4-72441 4-76378 4-80315 4-84252 4-88189 4-92126 4-96063 5-0000 5-0394 5-078730 5.1181 5-1575 5-1969 5-2362 5-2756 5-3150 5-3543 5-3937 5-4331 5-472440 5-5118 5-5512 5-5906 5-6299 5-6693 5-7087 5-7480 5-7874 5-8268 5-8661

50 5.9055 5,9449 5-9843 6-0236 6-0630 6-1024 6-1417 6-1811 6-2205 6-2598

60 6-2992 6-3386 6-3780 6-4173 6-4567 6-4961 6-5354 6-5748 6-6142 6,653570 6-6929 6-7323 6-7717 6-8110 6-8504 6-8898 6-9291 6-9685 7-0079 7-047280 7-0866 7-1260 7-1654 7-2047 7-2441 7-2835 7-3228 7-3622 7-4016 7-440990 7-4803 7-5197 7-5591 7-5984 7-6378 7-6772 7-7165 7-7559 7-7953 7-8346

200 7-8740 7-9134 7-9528 7-9921 8-0315 B-0709 8-1102 8-1496 8.1890 82281

10 8-2677 6-3071 8-3465 8-3858 8-4252 8-4646 8-5039 8-5433 8-5827 8-13L20 8-6614 8-7008 8-7402 8-7795 8-8189 8-8583 8-8976 8-9370 8-9764 9-015730 9-0551 9-0945 9-1339 9-1732 9-2126 9-2520 9-2913 9-3307 9-3701 9-409440 9-4488 9-4882 9-5276 9-5669 9-6063 9-6457 M850 9-7244 9-7638 9-8031

50 9-8425 9-8819 9-9213 9-9606 10-0000 10-0394 10-0787 10-1181 10-1575 10-1969

60 10-2362 10-2756 10-3150 10-3543 10-3937 10-4331 10-4724 10-5118 10-5512 10-590670 10-6299 10-6693 10-7087 10-7480 10-7874 10-8268 10-8661 10-9055 10-9449 10-984380 11 0236 11-0630 11-1024 11-1417 11-1811 11-2205 11-2598 11-2992 11-3386 11-378090 11-4173 11-4567 11-4961 11-5354 11-5748 11-6142 11-6535 11-6929 11-7323 11-7717

300 11.8110 11-8504 11-8898 11-9291 11-9685 12-0079 12,0472 12-0866 12-1260 12-165410 12-2047 12-2441 12-2835 12-3228 12-3622 12-4016 12-4409 12-4803 12-5197 12-559120 12-5984 12-6378 12-6772 12-7165 12-7559 12-7953 12-8346 12,8740 12-9134 1 2952830 12-9921 13-0315 130709 13-1102 13-1496 13-1890 13-2283 13-2677 13-3071 13,346540 13-3858 13,4252 13-4646 13-5039 13-5433 13,5827 13-6220 13-6614 13-7008 13,7402

50 137795 13-8189 13-8583 13-8976 13-9370 13-9764 14,0157 14-0551 14-0945 14-1339

60 14-1732 14-2126 142520 14-2913 14-3307 14-3701 14-4094 14-4488 14-4882 14-527670 145669 14-6063 14-6457 14-6850 14-7244 14-7638 14-8031 14-8425 14-8819 14-921380 14-9606 150000 15-0394 15-0787 15-1181 15-1575 151969 15-2362 15-2756 15,315090 15-3543 15-3937 15-4331 15-4724 15-5118 15-5512 15-5906 15-6299 15-6693 15-7087

400 15-7480 15-7874 15-8268 15-8661 15-9055 15-9449 15-9843 16-0236 16-0630 16-1024

P referred Sizes

D iameters: Lengths:

M 6

M 8

M10

M12

M16

M20

M24

M30

M36

1"4

-. 1116

3'

2

4

MM 10 1 2 16 20 25 30 35 40 45 50 55 60 65 70 75 80

Approx.inchequiv.

114- 1 sa 112- 124 2 24L 21 21 22- 3 31

M M 90 100 110 120 130 140 150 160 170 180 190 200

rox.inchequiv.

31 4 41 42 5 51- 6 61 62 7 71- 82 2 4 2 2 It 2

MM 220 240 260 280 300

Approx,inchequiv.

81 10 11 1 2

:rzen

G rade

$ 8

Grade

46

,aiii >a$ 'a'zef p ----Ealt

BS 3fi92

BS 41 JO

350

561

27727

44 840

439

32 700

3 2i

1 66

1 633

1 205

22 400

220

Pstric GQarsa Thaad

P itch {mm}

S tress area (mm'}

d iameter (Pitch diameter) (mmyU himate load

Proof load

Torque to induce load equal toBSjo of p roof load (for baits andnuts in tinplated c ondition

Ultimate load

Proof load

T orque to induce load egaiai to35/Q of proof ibad (foe bolts andnuts in tinplated condition)

ine itreads

U ltimate load

P itc$t {mm) { BS 3643 Pt 1 Table 3}Stress area {mm=)B asic effective diameter (Pitch diameter) { mm)

Proof load

G rade kN

38 T orgEae to induce load equal to85% o f proof load (for bolts are,nuts in uttFf.d c ondition)

U p to and ine. 125 mm long

Over 125 mm up to and inc. 200 mm long

fver 2 00 mm long

Up to and inc. 125 mm long

Ctver 1 25 m sn u p to and inc. 200 mm'.ongfiver 200 mm long

tsax. w idti n oose fiat-leans anc nutsitzx. w idth a eross c orners-bolts and nutsVomi;aai iaead d a:pth o& bolts

;.omina! cipth of nuts

k gf m

m

ibf ft

M5 (; M6 (`} M8 (") M1t7 {"} !1992 {"}

080 1 00 7 25 1 50 1 75 200 250

142 241 366 58:0 843

4430 5350 7183 9026 10863

1 130 1 610 2 920 4 640 6 750

111 153 283 455 662

3 380 4 910

331 481

10

9 8

72

kgf 565 805 1 465 2 320 3 375

kN 5-5 79 1 44 2 2 7 331

kgf 321 454

kN 31 45 31 12 8 18 7

kgf

_kNkgf

kgf

kN

$ 1

0 70

6 9090

503

16

22

35

1 170

1 15

1 19

i170

8 -63

2 130

20 9

2 90

2$

21

kgf m 027 0 46 1 12 223 3 89

Nm 2 68 4 54 11 22 38

ibf it 1-97 3 35 814 1613 23

rs (,'") h,'s {;} fv9;3 ( M 1o { " iv9'i2 { ")0 50 075 1 00

1610 2200 392

4675 5513 7350

1 290 1 760 3140

9 38 1 230 2 280

1 s 1s 2 222 24 28

1 25

3 550

32

343

6 {") M3Q ( ") M24 (i ") R73Q (1 " >f 1 }"} tVi36 (1

543 782

i 8 82 3 3 6 595 185 320 633

70 136 236

ilflls ("} lVI20 (;") M24 (1" ) PIl3t?(1}"r1} "j lifaS(1

12 6 22 4 34$ 52 5 953 155 219 354kgf m 4__80 31 3 i0 ' 6 05 1093 26 54 91 1 $4

N cta 7'81 1 281 3 0 5J 1 47 2 59 528 894 1808Ibf ft 573 945 2 2 4 4 ' 79 191 -

"t'a" ) _ it's il ( ") F:9 ti ( "} iSti 1 ca ( "} f1 S

._ __._

2 6 30 38 4 6 54

124 1$1

339 _ 660 1 334E go {") ivixa (i o (1

66

24 30 36 66 78

44 52 60 72 8435 3 7 41 45 49 5 7 6 5 7 3 $5 9 7nets (-"> ins ( ro