Bsi bs au 002a 1970 (2000)

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BRITISH STANDARD AUTOMOBILE SERIES

Specification for

Dimensions of 3 ; – 4 ; in
diameter fifth wheel
king pin for use with
extra heavy duty
semi-trailers

UD C 62 9 . 1 1 4. 2 . 0 1 3 . 6

BS AU 2a:1 970


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BS AU 2 a: 1 97 0

Fore word

This British Standard, prepared under the authority of the Automobile
Industry Standards Committee of BSI, was first published in 1 963.
This revision provides additional information regarding the dimensions,
including metric conversions.
This fifth wheel king pin is dimensionally interchangeable with that specified
in Standard No. SAE J848a of the Society of Automotive Engineers of the
United States of America.
A British Standard does not purport to include all the necessary provisions of

a contract. Users of British Standards are responsible for their correct
application.
C o mp liance with a British S tand ard doe s not o f itse lf co nfe r immunity
fro m le gal ob ligations.

S ummary o f p age s

This document comprises a front cover, an inside front cover, pages i and ii,
page 1 and a back cover.
This British Standard, having
been approved by the

This standard has been updated (see copyright date) and may have had

Mechanical Engineering

amendments incorporated. This will be indicated in the amendment table on

Industry Standards

the inside front cover.

Committee, was published
under the authority of
the Executive Board of
the Institution on
28 August 1 970
© BSI 02- 2000

The following BSI reference

relate to the work on this
standard:
Committee reference AUE/-

IS B N 0 5 80 0 6 0 2 3 3

Ame ndme nts issue d since p ub lication

Amd. No.

Date

Comments


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BS AU 2a:1970

Contents
Foreword

Figure 1 — 3

© BSI 02 - 2 000

Inside front cover

Page

1
Scope
1

2
D imensions and tolerances
1

"
– 4

"
in diameter fifth wheel king pin
1

i


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ii

blank


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BS AU 2 a: 1 97 0

1 S cop e

2 D imensions and tole rance s

This British Standard specifies dimensions for

2 . 1 D ime nsio ns.

a 3

king pin shall be as shown in Figure 1 .

" – 4" in diameter king pin for fifth wheel

attachment to semi- trailers for extra heavy duty.
NOTE 1

A fifth wheel king pin for attachment to semi- trailers

for normal and heavy duty is covered in BS AU 1 , “Dimensions

+

of 2 – 2

in diameter fifth wheel king pin for use with

All burrs and sharp edges shall be removed.
NOTE

It is recommended that fifth wheel couplings used with

this king pin be marked with their maximum imposed
weight- carrying capacity.

semi-trailers ”. The clearance dimensions and fifth wheel

positions are given in BS AU 3, “Clearance dimensions and fifth

2 . 2 Tole rance s.

wheel positions for tractors and semi-trailers ”.

be

NOTE 2

Figure 1 .

The values specified in imperial units are to be

regarded as the standard.

NOTE

The dimensions of the fifth wheel

The tolerance on machining shall

± 0. 01 0 in (0. 25 mm) or as otherwise stated in

All dimensions are in inches; metric equivalents, in millimetres, are shown in parentheses.

Figure 1 — 3

© BSI 02- 2000

"

– 4

"

in d iame te r fifth whe e l king p in

1


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BS AU 2a:1970

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