Bsi bs au 050 2 3 1994 (1999)

3.3 Definitions For the purposes of this Section of BSAU5 -2, the folowing definitions a ply : 3.3.1 nut hex g onal component with an a ial, threa ed hole and with its intend ed contact

Tyres and wheels —

U C6 9.1 3.0 2.3:6 9.1 4.4:6 1.8 2

This Bri sh Stan ard, ha ing

b en pre ared u der the

directonof the Automo ile

Stan ards Policy Commi e ,

waspublished u der the

authoriyof the Stan ards

Bo rdan comes

into efect on

1 J n ary1 9

© BSI 1 -1 9

The folowing BSI references

relate to the work on this

stan ard:

Commi e reference AUE/4

Draft for comment9 /85 9 DC

The prep ration of this British Stand rd was entrusted b the Automobi e

Stand ards Pol cy Commit e ( AUE/-) to Tech ical Commit e AUE/4, upon

which the fol owing bod ies were represented :

Ag ricultural Eng ine r ’ Association

Automobi e Association

British Industrial Truck Association

British Pres ure Gaug e Man facturer ’ Association

British Rub er Man facturer ’ Association

Bus and Coach Cou ci

Dep rtment of Transport

Freig ht Transport Association

Institute of Road Transport Eng ine r ( Inc)

Motor Cy cle Ind ustry ’s Association of Great Britain Ltd

Motor Ind ustry Resear h Association

National Ty re Distributor ’ Association

Retrea Man facturer ’ Association

Roa Haulag e Association Ltd

Society of Motor Man facturer and Tra er Ltd

Am endm ents is ued sinc publ cation

Annex A ( normativ e) Dimensions of DIN sphericalfaced

Annex D ( normativ e) Pro f test for conical faced and

Annex F ( normativ e) W edg e test for bolt hea s and stu col ar 15

Annex G ( normativ e) Torq ue/clamping -for e test for

Annex H ( informativ e) Torque/clamping -for e test

for conical faced and sphericalfaced n t ty pe fixing s 20

Fig ure A.1 — Dimensions of DIN sphericalfaced

Fig ure D.1 — Ada tor for pro f testing conicalfaced

Fig ure G.1 — Torq ue/clamping -for e test for n ts, bolts,

Fig ure H.1 — Torque/ clamping for e test for n ts, bolts

and studs for conical faced and sphericalfaced

Pag e

Ta le A.1 — Dimensions of DIN spherical faced

Ta le D.1 — Pro f test for conical faced and

Ta le G.1 — Torq ue/clamping -for e per ormance for

Ta le H.1 — Torque/clamping -for e per ormance for

Ta le H.2 — Torque/clamping -for e per ormance for

This section of BSA U5 has be n prep red u der the d irection of the Automobie

Stand rd s Pol cy Commit e , and it forms p rt of the series of d ocuments which

relate to ty res and whe ls for motor v ehicles

There has be n no at empt to fuly define roa -whe l components in a

desig n-restrictiv e sense, but neces ary requirements are specified to achiev e

secure fixing of commer ial v ehicle road -whe ls

Fir t, in order to improv e the al g nment and fit of mating p rts, certain important

dimensions with tolerances hav e be n specified in this document for fixing s, an

a new siz of24mm, which is alrea y in l mited use, has be n introd uced The

cor esponding tolerances on whe l dimensions hav e be n introduced in

BSAU5 -2.2

Secondly , perormance req uirements for nuts, stud s, and bolts are specified to

suit the specialz d sha es of whe l fixing s to ensure both a eq uate mechanical

streng th an repeata le torq ue/clamping -for e characteristic d uring long

period s of operation and repeated v ehicle serv icing Howev er, reference has be n

ma e to existing BS fastener specifications for the majority of perormance tests

It is ex ected that stud s and bolts wi l, in g eneral, be formed b forg ing and

rol ng , an this is the recommended method of man facture

Also in con ection with roa -whe l security , at ention is d rawn to BSA U5 -2.7

Cod e o pr a ctc fr the s le ton a nd ca r e o whe ls fr commer cia l vehicle

Ty re, whe l, rim and v alv e req uirements ore g iv en in the fol owing p rts and

sections of BSAU5 :

— Pa r t1: Tyr es;

— Se ton0: Gener a l;

— Se ton1: Ca r tyr es;

— Se ton2: Commer cia l vehicle tyr es;

— Se ton3: O ff-the-r oa d tyr es;

— Se ton4: A gr iculur a l tr a cto a nd ma chine tyr es;

— Se ton5d : Ind ustr ia l vehicle tyr es;

— Se ton6: Motor cycle tyr es;

— Se ton7: Moped tyr es;

— Se ton8: Cod e o pr a ct c f r the stor a ge o tyr es, in er tube a nd fla ps;

— Pa r t2: Whe ls a nd r ims;

— Se ton0: Gener a l (includ ing ter ms a nd d efiniions, a nd constr uct on a nd

wor kma nship) ;

— Se ton1b: R im pr ofie a nd d imensions (includ ing openings f r va lve ) ;

— Se ton2: Spe ifica tion f r d imensions o whe l na ve a nd h b c ntr es fr

commer cia l vehicle ;

— Se ton3: Spe ifica tion fr r oa d -whe l n ts, stud s a nd bol s f r commer cia l

vehicle ;

— Se ton4: Not publshed ;

— Se ton5b: R oa d whe ls ma nufa ctur ed wholy o pa r tly o ca st lght a llo f r

pa ss nger ca r s;

— Se ton6: Spe ifica tion f r r oa d whe ls ma nufa ctur ed wholy o pa r tly o

lght a llo f r moped s a nd moto cycle ;

— Se ton7: Cod e o pr a ct c f r the s le ton a nd ca r e o whe ls fr commer cia l

vehicle ;

— Se ton8: Cod e o pr a ctc fr the s le ton a nd ca r e o whe ls fr pa ss nger

ca r s (includ ing ca r a va ns a nd lght tr a iler s) ;

— Pa r t3: Va lve ;

— Se ton1: Spe ifica tion f r va lve d imensions;

— Se ton5: D imensions fr ISO cor e cha mber No.1 fr tyr e infla tion va lve ;

— Se ton6: D imensions fr ISO cor e cha mber No.2fr tyr e infla tion va lve ;

— Se ton7: Cod e o pr a ct c f r the s le ton a nd ca r e o tyr e infla tion va lve

fr pa ss nger ca r s (includ ing ca r a va ns a nd lght tr a iler s) ;

— Se ton8: Cod e o pr a ct c f r the s le ton a nd ca r e o tyr e infla tion va lve

fr commer cia l vehicle ;

— Se ton4: A gr iculur a l tr a cto a nd ma chine r ims;

— Se ton5: Ind ustr ia l vehicle r ims;

— Se ton6: Motor cycle r ims;

— Se ton7: Moped r ims

A British Stand rd do s not purport to includ e al the neces ary prov isions of a

contract User of British Stand rds are responsible for their cor ect a plcation

Com pl anc with a British Standard does not ofitself confer im munity

f om leg al o l g ations

Summ ary of pag es

This document comprises a f ont cov er, an insid e font cov er, p g esi to iv ,

p g es1 to2 , an insid e b ck cov er and a b ck cov er

This stand rd has be n up ated ( se copy rig ht d ate) and ma hav e had

amendments incorporated This wi l be indicated in the amendment ta le on the

Section 3 Specification

This Section of BSAU5 -2specifies dimensions

and per ormance req uirements for a rang e of siz s of

whe l an h b n ts, bolts, an studs for roa

v ehicles The rang e of siz s cov ered is normaly used

on heav y commer ial v ehicles, but if used on other

ty pes ofv ehicle the req uirements of this stand rd

are sti l a pl ca le

This stand rd d oes not cov er b ck-n ts which are

used to secure certain ty pes of stud to whe l h bs

but it do s cov er that p rt of the stud on which the

b ck-n t fits

The stand ard is a plca le to fastener for

spig ot-ocated whe ls

employ ing18mm, 20mm, 2 mm, and24mm

studs with hex g onal n ts fit ed with flat-seating ,

ca tiv e washer ( ty pe A mou ting ), cone-fixing s

of18mm, 7/8 in British Stand rd Fine ( BSF),

and1 in BSF siz s ( ty pe B mou ting ), and

sphericalfaced n ts for18mm,20mm and2 mm

siz s

NOT Mou tng ty es A an B are defined in BSAU5 -2.2

BSF thre ds are sp cified in BS8 ,which is o soles ent, an

such thre ds should b used only for re lacement comp nents for

e istng v hicles.Sphericalfaced n ts are sp cified in

DIN7 3 1an dimensional details are g iv n in Anne A

In a dition to the d efinitiv e req uirements, this

stand ard also req uires the items lsted in3.4 to be

d ocumented For compl ance with this stand ard ,

both the d efinitiv e req uirements and the

documented items hav e to be satis ied

3.2 Ref r nces

3.2.1 Normative referenc s

This Section of BSAU5 -2incorporates, b

reference, prov isions f om specific editions of other

publcations These normativ e references are cited

at the a propriate points in the text and the

publ cations are l sted on the inside b ck cov er

S bsequent amendments to, or rev isions of, any of

these publ cations a ply to this Section of

BSAU5 -2 only when incorporated in it b

upd ating or rev ision

3.2.2 Informative referenc s

This Section of BSAU5 -2 refer to other

publ cations that prov ide information or g uid nce

The editions of these publcations cur ent at the

time of is ue of this stand rd are l sted on the inside

b ck cov er, but reference should be ma e to the

latest ed itions

3.3 Definitions

For the purposes of this Section of BSAU5 -2, the

folowing definitions a ply :

3.3.1

nut

hex g onal component with an a ial, threa ed hole

and with its intend ed contact face of conical sha e,

spherical sha e, or car y ing a flat-faced, ca tiv e

washer ; used to secure the roa -whe l to the h b

3.3.2

ca tive washer

washer secured to a n t so as to prev ent los of the

washer but to permit rotation of the nut on the

washer a out the a is of the threa

3.3.3

bolt

external y threa ed fixing with a hea on one en

and usualy with a portion of u threa ed shan

a jacent to the hea

3.3.4

stud

external y threa ed component with threa s at both

ends and usual y with a flat-faced, cone-faced, or

sphericalfaced colar near to the centre portion

3.3.5

critical dimensions

dimensions which ensure inter hang ea i ty and

av oid the c eation of features l kely to result in po r

fatig ue streng th

3.3.6

clam ping forc

the for e which is a pl ed b the bearing face of the

fastener ag ainst a mating component after

a plcation of a specified tig htening torq ue

3.4 Inform a tion a nd requirements to

be a g reed and to be documented

The fol owing items to be ag re d betwe n the

contracting p rties, which are specified in the

clauses refer ed to, shal be fuly documented Both

the d efinitiv e req uirements specified throug hout

this Section of BSAU5 -2an the folowing

documented items shal be satis ied before a claim of

conformity can be ma e and v erified:

a) the ty pe of stud or bolt material,

i.e.throug h-hardened or case-hardened ( se 3.7);

b) special coating s of n ts, stud s or bolts ( se 3.9);

c) any lubrication req uirements ( se 3.14.5);

d) the samplng rates for desig n ev aluation and

conformity of production ( se B.1, B.2)

3.5 Sur ace condition

Nuts an ca tiv e washer , bolts, and stud s shal be

f e f om lo se s ale and cor osion

Nuts shal conform to BSEN4 3:19 2 in respect of

surace dis ontin ities

Bolts and studs shal conform to

BSEN2615 -3:19 2 in respect of sur ace

d is ontin ities

3.6 Captive washers for spig ot- type

wheel- nuts

Nuts intend ed for spig ot-ty pe whe ls shal

incorporate a ca tiv e washer

W here a ca tiv e washer is retained on the n t b

means of a swag ed, thin-wal extension to the n t,

such swag ing shal:

a) be f e fom splts;

b) securely retain the washer;

c) permit the washer suficient g eneral f e dom

such that the self-alg ning properties of the n t

on the washer are not imp ired

3.7 Ma teria ls

3.7.1 Bolts and studs

3.7.1.1 Thr ugh-hardened and tempered

mat erials

The material shal conform to either cond ition V of

BS9 0-1:19 1 or BS9 0-3:19 1 or property

clas 10.9of BSEN20 9 -1:19 2 ( se 3.4)

3.7.1.2 Cas -hardened mat erials

For bolts req uiring hig h surace hardnes ,

case-hardened or sur ace-hardened ste ls shal be

Nuts shal be ma e of ste l conforming to either

condition U of BS9 0-1:19 1 or property clas 10of

BSEN20 9 -6:19 2

3.8 Forming ofbolts and studs

In any man facturing operation, a smo th fi let

ra ius shal be formed at the ju ction of any head or

colar with the shan

For fi et ra i hav ing a9 °ar , the siz s shal

conform to Ta le 3 and Ta le 4 of3.1 4, which are

siz s eq uiv alent to those in ISO8 5:19 6

W here fi let ra i ne d to be u d er ut to prev ent

intererence with the corner of mating holes, such

rad ii shal be formed a ial y into the face of the hea

or col ar rather than rad ial y into the shan

( se also3.1 4)

N T 1 He ds an colar should prefera ly b formed b hot

or cold forg ing , an machining of such fe tures fom blan s or

b r-stock should b p rmi ed only b sp cial ag re ment b twe n

the stu / bolt man facturer an the v hicle or h b man facturer,

or, in the case of o solete desig ns where the v ehicle man facturer

is no long er in busines ,b sp cial ag re ment b twe n the

stu / bolt man facturer,the comp nent sup lier,an the user

N T 2 Sc ew thre ds an spline seratons should prefera ly

b formed b roling If thre ds or splines are to b machine-cut

an eiher left in a machined state or finished b roling , this

should b p rmi ed only b sp cial ag re ment b twe n the

stu /bolt man facturer an the v hicle or h b man facturer, or,

in the case of o solete desig ns where the v hicle man facturer is

no long er in busines , b sp cial ag re ment b twe n the stu / bolt

man facturer an the comp nent distributor

3.9 Coa ting s and sur ace tr atments

I the pur haser requires stud s, bolts or n ts to be

coated or to hav e a special sur ace treatment, the

ty pe of coating or treatment required shal be fuly

d ocumented ( se 3.4)

In ord er to av oid delay ed brit le f acture, p rts with

a sur ace hard nes g reater than3 0HV shal not be

subjected to acid ic proces es or be electro-plated ,

and p rts with a surace hardnes of320HV

to3 0HV shal be b ked after electroplating in

ac ord ance with ISO4 42:19 9

N T Certain co tng s, eiher metalic or org anic,red ce

ficton which impro es the eficiency of s rew thre ds Howe er,

some ty es of co tng , p rtcularly metal platng , can ha e an

adv r e efect on thre d eficiency when a plied similarly to

matng arts ( i.e.stu s an n ts, or n ts an ca tv washer )

Therefore, the torque/ clamping -fore tests an the

cor osion-resistance tests sp cified in3.1 5 an 3.1 6,

resp ctv ly , of this Secton of the stan ard should b used to

e aluate the efects of such tre tments

3.10 Thr a d form and qual ty

3.10.1 Metric threads

The thread forms an tolerances shal be as defined

in BS3 4 -2:19 1, tolerance clas es6g and6H

3.10.2 BSF threads

The thread forms an tolerances shal be as defined

in BS8 :19 6, medium clas

3.10.3 Gaug ing

Threa forms an d imensions shal be g aug ed

before the a pl cation of any protectiv e or

lubricativ e coating

3.11 Dimensions

3.1 1 Nuts with flat-seating , ca tive washer

The princip l d imensions and tolerances shal be as

g iv en in Fig ure 1 an Ta le 1

The ca tiv e washer shal hav e suficient swiv el ng

action or the as embly shal be suita ly ac urate to

ensure that the whe l contact face of the washer is

perpendicular to the a is of the thread within15½

3.1 2 Nuts with conical fac s

The princip l d imensions and tolerances shal be as

g iv en in Fig ure 2 and Ta le 2

The cone a is shal be concentric with the a is of the

thread within0.0 6in

The cone a is shal be p ral el with the a is of the

thread within15½

NOT The dimensions refer to Ta le 1

Fig ure 1 — Dimensions of flat-fac d nuts

Ta le 1 — Dimensions of flat- fac d nuts

Dimensions in milimetres

Ba

NOT The dimensions refer to Ta le 2

Fig ure 2 — Dimensions of conical- fac d nuts

Ta le 2 — Dim ensions of conicalfac d nuts

Table 3 — Critical dim ensions of studs

3.1 3 Nuts with spherical fac s

The a is of the thread and the sphere shal be

concentric within0.15mm

In other d imensional respects spherical faced nuts

shal conform to DIN7 3 1:19 2 ( se Annex A)

3.1 4 Studs and bolts

Critical dimensions an tolerances shal be as g iv en

in Fig ure 3 and Fig ure 4 and Ta le 3 and Ta le 4

The thick es of the colar, t, wi l be d etermined b

indiv idual d esig n req uirements but, for any

p rticular ty pe, the dimensional tolerance shal

be±0.15mm

The blen ra i , r

cmin and r

c

ma shal also a ply

to studs with colar hav ing two flat faces

The cone a is or the centre of the spherical rad ius

shal be concentric with the a is of the threa

within0.15mm

The cone a is shal be p ral el with the threa a is

within15½

The flat face of the colar shal be perpendicular to

the a is of the threa within3 ½

NOT W hen comp nents are man factured as re lacements to

fi e istng desig ns of h b, care should b taken to ensure that

filet radi do not interere wih e istng chamfer or cle rances

th s pre entng cor ect se tng of the he ds or colar

3.12 Testing

3.12.1 Desig n a pro al

To comply with the requirements of this Section of

this stand rd , nuts,bolts,and studs shal fir t hav e

the desig n v al d ted b test samples which shal

demonstrate conformity to the per ormance

requirements g iv en

in3.14.1,3.14.2,3.14.3, 3.14.4, 3.14.5, and3.14.6

Any chang e in d etai desig n, ty pe of finish, or

material specification shal be folowed b

rev ald ation

3.12.2 Conformity of pro uction

To comply with the requirements of this Section of

this stand rd , n ts, bolts, an stud s shal

demonstrate conformity

to3.14.1, 3.14.2, 3.14.3,3.14.4, and3.14.6

The results of the tests shal be interpreted and

re-ex mination or retesting car ied out in

ac ord nce with the c iteria specified inB.2

N T 1 The dimensions refer to Ta le 3.

N T 2 The two ty es of filet shown on e ch flat face are alternatv es: r

NOT 1 The dimensions refer to Ta le 4.

NOT 2 The two ty pes of filet shown on e ch flat face are alternatv s:r

c

=conv ntonal filet

radius, r

u

=u der ut filet (se 3.8)

Fig ure 4 — Critical dimensions of bolts

Ta le 4 — Critical dimensions of bolts

3.12.3 Preparation of test components

Tests shal be car ied out only on components

representativ e of normal prod uction an fuly

finished in al respects of materials, heat-treatment,

coating , and dimensions

3.13 Disposa l oftested components

Nuts, studs, and bolts which hav e be n subjected to

perormance tests shal be either stored securely for

future reference or destroy ed and shal not be

permit ed to be used in serv ice

3.14 Per orma nce

3.14.1 Pro f test for flat- fac d nuts

W hen tested in ac ord ance with Annex C, flat-faced

nuts shal conform to the fol owing req uirements

a) There shal be no faiure of the n t b f acture

or threa strip ing , or b c acking as indicated b

penetrant-dy e or mag netic-p rticle test methods

b) There shal be no v isible c acks in the washer

as ind icated b penetrant-dy e or

mag netic-p rticle test method s

c) After release of the test for e, the nut/washer

heig ht, H, shal not hav e d ec eased b more

than0.13mm, and the nut shal be completely

remov ea le f om the threa ed fixture b the

unaided hand, althoug h a hand-wrench ma be

used to release the n t for the fir t18 d eg re s of

rotation

d ) Any thread distortion of the nut after test shal

be ac epta le if it p s es an inspection with a

“ GO/NO-GO” threa g aug e man factured to the

p rticular threa d esig nation

NOT S ould the n t fail when tested using a compres iv

for e i is p rmis ible to re e t the test on a new n t using a

tensile fore

3.14.2 Pro f lo d test for conical- fac d and

spherical- fac d nuts

W hen tested in ac ord nce with Annex D,

conicalfaced an spherical faced n ts shal conform

to the fol owing requirements

a) There shal be no fai ure of the n t b f acture

or threa strip ing , or b c acking as ind icated b

penetrant-d y e or mag netic-p rticle test method s

b) Any thread distortion of the n t after test shal

be ac epta le if it p s es an inspection with a

“GO/ NO-GO” threa g aug e man factured to the

p rticular thread desig nation

N T S ould the n t fail when tested using compres iv

fore i is p rmis ible to re e t the test on a new n t using a

tensile for e

3.14.3 Me hanical properties of studs and

b lts

3.14.3.1 Thr ugh-hardened studs and bolt s to

ISO pr pert y clas 10 9with ISO met ric

t hreads

Stud s an bolts shal conform to5,6, and7of

BSEN20 9 -1:19 2 for property clas 10.9, with

the exceptions of the pro f test and the wed g e

test,8.4 and8.5,respectiv ely , of that stand ard The

wed g e test shal be cond ucted as specified in3.14.4

The pro f test shal be cond ucted in ac ord nce with

Annex C and the leng th of the stu or bolt after

loa ing shal be the same as before loa ing within a

tolerance of±1 5Èm alowed for measurement

er or

3.14.3.2 Thr ugh-hardened studs and bolt s to

B S970condition Vwit h B SF threads o ISO

metric t hreads

The material properties shal conform to

BS9 0-1:19 1or BS9 0-3:19 1, and , ad ditionaly ,

when pro f tested in ac ord ance with Annex E, the

leng th of the stud or bolt after load ing shal be the

same as before load ing within a tolerance

of±1 5Èm alowed for measurement er or

3.14.3.3 Cas -hardened studs and b lt s with

B SF o ISO metric t hreads

S r ace an core hard nes es shal be as specified

in3.7.1.2

W hen pro f tested in ac ord nce with Annex E, the

leng th of the stud or bolt after load ing shal be the

same as before load ing within a tolerance

of±1 5Èm alowed for measurement er or

3.14.4 Wedg e test for bolt- hea s and

stud- col ar

W hen tested in ac ord ance with Annex F, bolts and

stud s of any material shal conform to the fol owing

req uirements

a) The hea or col ar shal not break of

T r a siz Blend ra i to hea or se rations

r

cmin

in

r

umin

The M1 ×2.0thre d is a UK size an , therefore,the other

dimensions for this ty e of b lt are g iv n in imp rial u is

b) There shal be no c acks in the ju ction of the

shank and hea or col ar as ind icated b

penetrant-d y e or mag netic-p rticle test methods

3.14.5 Torque/clam ping -forc test

W hen tested in ac ord nce with Annex G, the

clamping for e for flat-faced n ts, stud s, bolts and

n t/stu or nut/ bolt as embles shal be within the

p rticular nominal threa siz as l sted in Annex G

for each a plcation of torq ue

NOT 1 I is recommen ed that when tested in ac ordance wih

Anne H, the clamping for e for conicalfaced an sphericalfaced

n ts, stu s,b lts an n t/stu or n t/bolt as emblies should b

wihin the rang e of v lues C

min

to C

ma

a pro riate to the

p rtcular nominal thre d size as listed in Anne H for e ch

a plicaton of torque

W hilst the data in Anne H ha e b en prod ced the retcaly,

limied test work that has b en car ied out in icates that the

v alues are re listc Therefore,fastener conforming to Anne H

would b e p cted to pro ide fi ing s of a qualiy to ensure

ade uate whe l securiy

I the use of a lubricant is fou d to be neces ary for

the components to conform to the c iteria for

ac eptance, this shal be stated in the test results

The specification of the lubricant, detais of the

sur aces lubricated, and the f eq uency of

re-a plcation shal also be stated

NOT 2 Ide ly comp nents should me t the torque/ tension

re uirements wihout lubricaton, but i is likely that most

comp nents, e en wih sp cial co tng s, wil ne d lubricaton

(se also 4 an the note to 9)

3.14.6 Cor osion resistanc test

Nuts, studs, and bolts with special coating s or metal

plating intend ed to prov ide cor osion resistance

shal be subjected to a cor osion protection test as

ag re d betwe n the v ehicle man facturer, the user

an the component man facturer/sup l er, as

neces ary

Chemical analy sis certificates and / or metal

sup l er ’ analy sis certificates, chemical analy sis

record s, mechanical test record s, heat-treatment

furnace charts, dimensional record s and records of

compl ance with the perormance tests specified

in3.14 a pertaining to al components shal be

retained b the man facturer for a minimum period

of10year

3.16 Marking and identification

3.16.1 Nuts

Nuts with left-hand threa s shal be clearly marked

b a let er L indented on two diametrical y op osite

flats The heig ht of these let er shal be not les

than7mm

NOT The trade mark of the comp nent man facturer or the

v hicle man facturer should prefera ly b marked on the n t or

on the ca tv washer of the n t b emb s ing or in entaton

3.16.2 Studs and bolts

The head s of bolts shal be clearly marked b

embos ing or indentation BSAU5 :2:3

1)

the trad e

mark of either the component man facturer or the

v ehicle manufacturer, and, for components

man factured f om throug h-hardened ste ls, with

either the BS or ISO property clas of ste l For bolts

which are case-hard ened or sur ace-hard ened , the

head s shal be marked CH

NOT At the o ton of the comp nent man facturer, the en s

of throug h-hardened stu s should b marked wih the BS or ISO

pro erty clas of the ste l an / or the trade mark of the comp nent

man facturer or the v hicle man facturer

1)

Marking BSAU5 :2:3 on or in relaton to a prod ct re resents a man facturer ’ declaraton of conformiy, i.e.a claim b or on

b half of the man facturer that the prod ct me ts the re uirements of the stan ard The ac uracy of the claim is solely the

claimant’s resp nsibiliy S ch a declaraton is not b confused wih a third p rty certficaton of conformiy, which ma also b

desira le