Bsi bs au 245 1992 (1999) iso 8035 1991

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BRITIS H S TAND ARD AUTO MO BILE S E RIE S

BS AU 2 4 5 :
1 992
IS O 80 3 5 : 1 9 9 1

S p e cification for

Front towing
attachme nts for
comme rcial road
ve hicle s and b use s
ove r 3 . 5 t


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BS AU 245:1992

Committees responsible for this
British Standard
The preparation of this British Standard was entrusted by the Automobile
Standards Policy Committee (AUE/- ) to Technical Committee AUE/1 5, upon
which the following bodies were represented:
Association of Trailer Manufacturers
Caravan Club
Department of Transport
Metropolitan Police
Motor Industry Research Association

National Caravan Council Limited
Society of Motor Manufacturers and Traders Limited

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

Amendments issued since publication

1 May 1 992
© BSI 1 0- 1 999

The following BSI references
relate to the work on this
standard:
Committee reference AUE/1 5
Draft for comment 83/7361 6 DC

ISBN 0 580 20831 1

Amd. No.

Date

Comments

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BS AU 245:1992

Contents
Page
Committees responsib le
National foreword

ii

1

Scope

1

2

Normative references

1

3

D efinitions

1

4

Location of attachment

1

5

Shape

1

6

Strength

1

7

Testing

2

8

Requirements

List of references

© BSI 1 0- 1 999

Inside front cover

2
Inside back cover

i


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BS AU 245 :1 992

National foreword

This British Standard has been prepared under the direction of the Automobile
Standards Policy Committee. It is identical with ISO 8035: 1 991
vehicles and b uses ov er 3, 5 t — Fro nt to w ing attachm ents,

Com m ercial road

published by the

International Organization for Standardization (ISO).
Cross-references
International Standard

Corresponding British Standard

ISO 1 1 02: 1 986

BS AU 220: 1 988

Sp ecification for dim ensions of 50 m m

draw b ar coup lings b etw een com m ercial ro ad v ehicles
and trailers

(Identical)
ISO 5422: 1 982

BS AU 1 88: 1 983
rop es,

Sp ecification for ancho rages for to w ing

cab les or b ars for road v ehicles

(Identical)
The Technical Committee has reviewed the provisions of ISO 1 1 76 and ISO 3833,
to which normative reference is made in the text, and has decided that they are
acceptable for use in conj unction with this standard.
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 and 2, 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 0- 1 999


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BS AU 2 4 5 : 1 992

3.4

1 S cop e

This International Standard specifies the
characteristics required of attachments mounted on

anchorage

see ISO 5422

the front of commercial road vehicles and buses (as
defined in ISO 3833) of maximum total authorized

4 Location of attachment

mass over 3, 5 t (ISO- M08). The attachment permits

The attachment shall be installed at the front of the

the use of ropes, cables or bars, at the choice of the

vehicle and shall not proj ect in the horizontal plan

manufacturer, allowing the vehicle to be towed, or

beyond the exterior contour of the vehicle (body plus

otherwise manoeuvred by other vehicles, or to be

bumpers) except during towing.

used for manoeuvring other vehicles. It excludes
attachments for emergency operations, e. g. recovery

5 Shape

of road vehicles after an accident.
This International Standard does not apply to
special purpose vehicles and standard vehicles used
for special applications.
2 Normative re fe re nce s

The following standards contain provisions which,

through reference in this text, constitute provisions
of this International Standard. At the time of
publication, the editions indicated were valid. All
standards are subj ect to revision, and parties to
agreements based on this International Standard
are encouraged to investigate the possibility of
applying the most recent editions of the standards

5.1

The shape of the attachment is left to the

discretion of the manufacturer, subj ect to the
condition that it shall comply with the requirements
given in this International Standard.
It shall permit the attachment of ropes, cables or
bars for towing, without the aid of special tools or
auxiliary parts.
It shall permit a displacement of ± 50 ° of arc
horizontally and ± 6 ° vertically of the ends of towing
devices (steel rope or bar), fixed between the towing
and the towed vehicle.
5.2

The attachment shall not damage the rope, cable

or bar during towing.

indicated below. Members of IEC and ISO maintain

Any detachable parts shall be secured so that they

registers of currently valid International Standards.

cannot be lost.

ISO 1 1 02: 1 986,

During operation the rope, cable or bar shall not

Com m ercial road v ehicles —

Mechanical connections b etw een tow ing vehicles and
trailers — 50 m m draw b ar co up lings.

ISO 1 1 76: 1 990,

Ro ad v ehicles — Mass es —

Vocab ulary and codes.

ISO 3833: 1 977,

ISO 5422: 1 982,

5.3

The shape should permit the use of the bar as

described in ISO 1 1 02, if the manufacturer agrees to

the use of bars for towing the vehicle.

Ro ad v ehicles — Typ es — Term s

6 S tre ngth

and definitions.

tow ing ro p es,

come loose.

Ro ad v ehicles — Anchorages fo r

cab les or b ars.

The attachment shall be designed to withstand a
static force with a value at least:
ISO- M08

3 D e finitions

a)

For the purposes of this International Standard, the

vehicles;

following definitions apply.
3.1

co mp le te ve hicle ke rb mass

see ISO 1 1 76 (code ISO- M06)

b)

×

g

2

ISO- M06
2

×

g

for goods transport commercial

for passenger transport

commercial vehicles (buses)
where

3.2

ISO- M08 and ISO- M06 are as defined in

maximum authoriz e d to tal mass

and

see ISO 1 1 76 (code ISO- M08)

g

3.3
sp e cial p urp ose ve hicle s and sp e cial
ap p lications o f stand ard ve hicle s

3.1

3.2

respectively;

is the acceleration due to gravity, applied as

specified in clause
NOTE 1

7.

In the case of vehicles towing trailers and articulated

vehicles, the maximum authorized total mass is the one stated in
the note of ISO 1 1 76 for the tractive units.

see different types in ISO 3833

© BSI 1 0- 1 999

1


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BS AU 2 4 5 : 1 992

7. 2 . 2

7 Te sting
7. 1 Te st conditions

The vehicle shall be appropriately immobilized, at
maximum authorized total mass or at complete
vehicle kerb mass as specified by the vehicle
manufacturer, on a firm horizontal surface.
The vehicle manufacturer is allowed, if he desires,
to carry out the test on the body or on the chassis of
the vehicle in total or in parts, provided that it is
fixed rigidly to the bench with attachment links to
the front suspension and provided the parts in the
surrounding area of the towing device are in place.

7. 2 . 3

At the choice of the manufacturer, compliance

with the test may also be verified by calculation.
8 Re quireme nts

After each test carried out as specified in clause
the vehicle shall meet the requirements set in
and
8. 1

7,

8. 1

8. 2 .

The attachment shall show no deformation

liable to affect normal operation.
8. 2

Devices mounted in the proximity of the

attachments (for example compulsory lighting or

7 . 2 Te st p roce d ure
7.2.1

Both tests shall be carried out horizontally in

the longitudinal vehicle direction.

The towing attachment shall be subj ected to

two tests: one with a static compressive force and

signalling devices, braking and steering systems)
shall show no damage preventing normal operation.

the other one with a static tractive force equal to the
force defined in

6

a) or

6

b) . These forces shall be

applied progressively.

2

© BSI 1 0- 1 999


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List of references

See national foreword.

© BSI 1 0- 1 999

BS AU 245:1992


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BS AU 245:
1992
ISO 8035:1991

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