Bsi bs au 214 2 1988 (1999) iso 7646 1986

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BRITISH STANDARD AUTOMOBILE SERIES

BS AU
21 4-2:1 988
ISO 7646:1 986

Gearbox flanges —
Part 2: Specification for dimensions for
type A gearbox flanges for commercial
vehicles and buses
[ISO title: C ommercial vehicles and buses — Gearbox flanges —
Type A]

UD C 62 9 . 1 1 4. 4/. 5 3 : 62 1 . 82 5 . 2 4


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BS AU 21 4-2:1 988

Committees responsible for this
British Standard

The preparation of this British Standard was entrusted by the Automobile
Standards Committee (AUE/- ) to Technical Committee AUE/1 3, upon which
the following bodies were represented:
British Railways Board
Department of Transport (Highways)
Freight Transport Association

Institute of Road Transport Engineers (Incorporated)
London Regional Transport
Ministry of Defence
National Bus Company
Road Haulage Association Ltd.
Society of Motor Manufacturers and Traders Limited

This British Standard, having
been prepared under the
direction of the Automobile
Standards Committee, was
published under the authority
of the Board of BSI and comes
into effect on

Amendments issued since publication

29 January 1 988
© BSI 1 2- 1 999

The following BSI references
relate to the work on this
standard:
Committee reference AUE/1 3
Draft for comment 82/75548 DC

ISBN 0 5 80 1 63 64 4

Amd. No.

Date of issue

Comments


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BS AU 21 4-2:1 988

Contents

Page
Committees responsib le
National foreword

ii

1

Scope and field of application

1

2

References

1

3

D imensions and tolerances

1

4

D esignation

1

Figure 1

2

Figure 2

2

Figure 3

3

Figure 4

3

Figure 5

4

Tab le — D imensions and tolerances
Pub lications referred to

© BSI 1 2 - 1 999

Inside front cover

4
Inside back cover

i


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BS AU 21 4-2:1 988

National foreword

This British Standard has been prepared under the direction of the Automobile
Standards Committee and is identical with ISO 7646: 1 986 “Co m m ercial
and b uses — Gearb ox flanges — Typ e A

v ehicles

”, published by the International

Organization for Standardization (ISO) .
Terminology and conventions. The text of the International Standard has

been approved as suitable for publication as a British Standard without
deviation. Some terminology and certain conventions are not identical with those
used in British Standards; attention is drawn especially to the following.
The comma has been used as a decimal marker. In British Standards it is current
practice to use a full point on the baseline as the decimal marker.
Wherever the words “International Standard” appear, referring to this standard,
they should be read as “British Standard”.
Cross-references
International Standard

Corresponding British Standard

ISO/R 286: 1 962

BS 4500

ISO lim its and fits

Part 1 : 1 969

General,

tolerances and dev iations

(Technically equivalent)
ISO 7647: 1 986

BS AU 21 4
Part 3: 1 987

Gearb o x flanges
Sp ecificatio n fo r dim ensio ns fo r typ e S

gearb ox flanges for com m ercial v ehicles and b us es

(Identical)
The Technical Committee has reviewed the provisions of ISO 1 1 01 : 1 983 to which
reference is made in the text, and has decided that they are acceptable for use
in conj unction with this standard. A related British Standard to ISO 1 1 01 is
BS 308 “Engineering

draw ing p ractice

” Part 3: 1 972 “Geo m etrical

to lerancing

”.

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.
Compliance with a British Standard does not of itself confer immunity
from legal obligations.

Summary of pages

This document comprises a front cover, an inside front cover, pages i and ii,
pages 1 to 4, an inside back cover and a back cover.
This standard has been updated (see copyright date) and may have had

amendments incorporated. This will be indicated in the amendment table on the
inside front cover.
ii

© BSI 1 2- 1 999


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BS AU 21 4-2:1 988

1 Scope and field of application

3 Dimensions and tolerances

This International Standard specifies the nominal

Nominal dimensions, tolerances and bolt hole fixing

dimensions and tolerances which affect the

positions which affect the interchangeability of type

interchangeability between gearbox flanges and

A flanges for gear- boxes are shown in Figure 1 to

mating parts used on commercial vehicles and

Figure 5, and given in the Table.

buses. The flanges covered by this International
Standard are designated type A. They are not
interchangeable with type S flanges dealt with
in ISO 7647.

4 Designation
Gearbox flanges meeting the requirements of this
International Standard shall be identified by the

Dimensions not specified are left to the discretion of

following details in the order specified:

the component manufacturer.

a) reference to this International Standard;
b) the diameter of the flange,

2 References
ISO 286,

ISO sys tem of lim its and fits

ISO 1 1 01 ,

orientatio n,

lo catio n and run- out — Generalities ,

definitions ,

indicatio ns on draw ings.

ISO 7647,

Road v ehicles — Gearb ox flanges for

1;

c) the number of fixing bolts;

.

d) the size of the fixing bolts.

Technical draw ings — Geom etrical

to lerancing — Tolerancing of fo rm ,

sym b ols,

1)

d

Exam p le:

Designation of a gearbox flange type A with
d

1

= 1 50 mm and eight 1 2 mm fixing bolts:
Flange ISO 7646-1 5 0

×

8

×

12

co m m ercial v ehicles and b uses — Typ e S.

1)

At present at the stage of draft. (Revision of ISO/R 286: 1 962. )

© BSI 1 2- 1 999

1


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BS AU 21 4-2:1 988

2

Figure 1

Figure 2

Position and run- out tolerances in millimetres

© BSI 1 2 - 1 999


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© BSI 1 2 - 1 999

Figure 3

Figure 4

BS AU 21 4-2:1 988

Position and run- out tolerances in millimetres

3


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BS AU 21 4-2:1 988

Position and run-out tolerances in millimetres

Figure 5
Table — Dimensions and tolerances

Dimensions in millimetres

d1

75
90
100
120
150
165
180
225

Number of

number

holes

Figure 2
Figure 1
Figure 2
Figure 2
Figure 3
Figure 3
Figure 5

Figure 3
Figure 4
Figure 5

a See ISO 286.
b This dimension

4

Figure

6
4
6
6
8
8
12
8
10
12

d5

+0,2
0

d3
h7 a

d2

d4 b
0
–0,2

6,1

62

42

51,6

8,1

74,5

47

8,1
10,1

84
101,5

12,1

130

16,1
16,1
16,1

140
155,5
196

l

h

0
–0,5

0
–0,2

5,5

1,8

61

6

2,3

57
75

70,5
84,3

7
8

2,3
2,3

90

110,7

10

2,3

95
110
140

115
130,5
171

12
12
15

2,3
2,3
4

shall be used when required to prevent bolt heads from rotating.

© BSI 12-1999


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Publications referred to

See national foreword.

© BSI 1 2 - 1 999

BS AU 21 4-2:1 988


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BS AU
21 4-2:1 988
ISO 7646:1 986

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