Bsi bs au 002a 1970 (2000)

BRITISH STANDARD AUTOMOBILE SERIES BS AU 2a 1970 Specification for Dimensions of 3; – 4; in diameter fifth wheel king pin for use with extra heavy duty semi trailers UDC 629 114 2 013 6 L ic e n s e d[.]

BRITISH STANDARD AUTOMOBILE SERIES

U C 6 9.1 4.2.0 3.6

This Bri shStan ard, ha ing

b en a pro ed b the

MechanicalEng ine ring

In ustryStan ards

Commi e ,was published

u derthe authoriy of

theEx cutv Bo rd of

theInst uton on

2 Aug ust 1 7

© BSI 0 -2 0

The folowing BSI reference

relateto the work on this

stan ard:

Commi e reference AUE/

-ISBN 0 5 0 0 0 3 3

This BritishStand rd, prep red u der the authority of the Automobie

Industry Stand rds Commit e ofBSI, was fir t publshed in 19 3

This rev ision prov ides a d itional information reg ard ing the d imensions,

including metric conv er ions

This fifth whe l king pin is d imensionaly inter hang ea le with that specified

in Stand rd No SAE J 4 a of the Society of Automotiv e Eng ine r of the

United States ofAmerica

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

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Compl anc with a British Standard does not of itselfconfer imm unity

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Sum m ary of pag es

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p g e1 an a b ck cov er

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

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

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Am endm ents is ued sinc publ cation

Pag e

Fig ure 1 — 3"–4" in diameter fifth whe l king pin 1

b

1 Scope

This BritishStand rd specifies dimensions for

a3"–4" in diameter king pin for fifth whe l

at achment to semi traier for extra heav y d uty

NOT 1 A fifth whe l king pin for at achment to semi-trailer

for normal an he v d ty is cov ered in BS AU1, “ D imensions

of2–2+in d iamete fifth whel kin pin for us wih

s mi-tr aier s”.The cle rance dimensions an fifth whe l

p si ons are g iv n in BS AU3, “Clear anc d imensions a d fifth

whe l p si ons for tr a ctor s a d smi-tr aier s”

NOT 2 The v lues sp cified in imp rial u is are to b

reg arded as the stan ard

2 Dimensions and tolerances

2.1Dimensions The dimensions of the fifth whe l

king pin shal be as shown in Fig ure 1

All bur s an sharp edg es shal be remov ed

NOT I is recommen ed that fifth whe l coupling s used wih

this king pin b marked wih their ma imum imp sed

weig ht-carying ca aciy

2.2 Toleranc s The tolerance on machining shal

be±0.010in( 0.25mm) or as otherwise stated in

Fig ure 1

NOT All dimensions are in inches;metric e uiv alents,in milimetres, are shown in p rentheses

Fig ure 1 — 3" –4" in diameter fifth whe l king pin

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