ISO 11407:2004

INTERNATIONAL ISO
STANDARD 11407
Second edition
2004-11-01

Commercial road vehicles — Mechanical
coupling between towing vehicles, with
coupling mounted forward and below,
and centre-axle trailers —
Interchangeability
Véhicules routiers utilitaires — Accouplement mécanique entre
véhicules tracteurs à dispositif d'attelage avancé et surbaissé et
remorques à essieux centraux — Interchangeabilité




Reference number
ISO 11407:2004(E)
©
ISO 2004

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ISO 11407:2004(E)
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ii © ISO 2004 – All rights reserved

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ISO 11407:2004(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope. 1
2 Interchangeability dimensions . 1
2.1 Distance between drawbar coupling axis and rear end of towing vehicle . 1
2.2 Turning front of trailer . 2
2.3 Height of couplings. 3
2.4 Drawbar contour . 3
2.5 Rear end of towing vehicle . 3
2.6 Angles of inclination and articulation. 3
3 Possible combinations and marking . 5
Annex A (informative) Classes of dimensions for C . 7
min
Annex B (informative) Vehicle combinations — Examples of configurations . 8
Bibliography . 9

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ISO 11407:2004(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 11407 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 15,
Interchangeability of components of commercial vehicles and buses.
This second edition cancels and replaces the first edition (ISO 11407:1993), which has been technically
revised.
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ISO 11407:2004(E)
Introduction
In many countries, the total length of road trains is limited by law. In view of the increasing demand for
large-volume transports, vehicle manufacturers have developed solutions for optimizing the loading space of
road trains within the legal specification. Centre-axle trailers are a well-proven means of reducing the
necessary free space between towing vehicles and trailer, thereby increasing loading space while keeping
within legal limitations.
New demands, wider usage and further development of the concept have lead to further changes. To increase
the volume even more, lower vehicle chassis have been developed. There is also a growing demand for extra
equipment in the overhang, such as retractable tail lift and additional drawbar coupling fitted in the end of the
chassis frame.
In order to prevent interference between the drawbar and this extra equipment, specifically on low chassis, it
has become necessary to introduce a new, “low” class of drawbar profile.
A new category of road train (25,25 m) has been introduced in Finland and Sweden, the intention being that it
will be possible to couple vehicles conforming with this International Standard to combinations of more than
one trailer. Consequently, this edition of ISO 11407 is applicable to drawbar and drawbar coupling positions
on those road trains, as well.

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INTERNATIONAL STANDARD ISO 11407:2004(E)

Commercial road vehicles — Mechanical coupling between
towing vehicles, with coupling mounted forward and below, and
centre-axle trailers — Interchangeability
1 Scope
This International Standard specifies the interchangeability requirements of the various elements and
dimensions for the mechanical coupling of towing vehicles whose coupling is mounted forward and below to
centre-axle trailers. It is applicable to road trains for the commercial transport of low-density, high-volume
cargo of the greatest possible variety. It is also applicable to corresponding equipment in cases where the
same vehicle makes up part of a road train having more than one trailer. It is not applic
...