Road vehicles - Drawbar couplings and eyes for hinged drawbars - Strength tests

This International Standard specifies strength test conditions and requirements for the 40 mm and 50 mm drawbar couplings and corresponding drawbar eyes for hinged drawbars. NOTE See ISO 3584 [1] for couplings, and ISO 1102 [2] and ISO 8755 [3] for eyes.

Véhicules routiers — Pivots et anneaux pour barres d'attelage articulées — Essais de résistance

La présente Norme internationale spécifie les conditions d'essai de résistance et les exigences de résistance des pivots de 40 mm et de 50 mm et des anneaux de remorquage correspondants pour les barres d'attelage articulées. NOTE Voir l'ISO 3584 [1] pour les pivots, l'ISO 1102 [2] et l'ISO 8755 [3] pour les anneaux de remorquage.

General Information

Status
Published
Publication Date
19-Dec-2001
Current Stage
9093 - International Standard confirmed
Start Date
23-Oct-2023
Completion Date
13-Dec-2025

Relations

Effective Date
15-Apr-2008

Overview

ISO 8718:2001 is an international standard developed by the International Organization for Standardization (ISO) focused on the strength testing of drawbar couplings and eyes for hinged drawbars used in road vehicles. Specifically, it covers the test conditions and requirements for 40 mm and 50 mm drawbar couplings and their corresponding drawbar eyes. The standard ensures the mechanical integrity, reliability, and safety of these critical components which connect towing vehicles to trailers.

This second edition, which replaces the first edition from 1988, specifies static and dynamic strength tests that simulate real-world driving conditions. By enforcing these standards, manufacturers and testing labs worldwide can verify the durability and performance of these couplings to enhance road safety and ensure interchangeability of components.

Key Topics

  • Scope of Testing
    The standard sets the framework for applying both static and dynamic strength tests to drawbar couplings and eyes with 40 mm and 50 mm dimensions, critical to hinged drawbars on road vehicles.

  • Test Setup Requirements
    Tests must be performed on a test bed replicating real vehicle mounting conditions and incorporate the fitting instructions provided by drawbar manufacturers. Both components may be tested separately or combined.

  • D-value Calculation
    A key parameter in the standard, the D-value represents the longitudinal forces between towing vehicle and trailer. It is calculated based on the maximum design total mass of both vehicles and the acceleration due to gravity.

  • Dynamic Strength Test
    Involves sinusoidal application of horizontal force oscillating between +0.6 D and -0.6 D for 2 million cycles, simulating realistic towing stress without causing permanent damage.

  • Static Strength Test
    Includes testing closure and locking devices of coupling under a static force of 0.25 D to ensure no inadvertent opening or damage during use.

  • Strength Criteria
    The tested drawbar couplings and eyes must withstand the specified forces without permanent deformation, cracks, breaks, or loss of locking functionality.

Applications

ISO 8718:2001 is primarily applied in the commercial vehicle and trailer manufacturing industry, where it supports:

  • Design and Quality Assurance: Manufacturers use the standard to validate the strength and reliability of drawbar couplings and eyes ensuring durability under operational stresses.
  • Safety Verification: Compliance with this standard helps prevent mechanical failures that could lead to accidents or cargo loss, enhancing road vehicle safety.
  • Interchangeability: The standard facilitates component compatibility and interchangeability across different manufacturers by specifying test conditions tied closely to functional dimensions.
  • Regulatory Compliance: Supports meeting legal and regulatory requirements imposed on coupling components used within different countries or regions.
  • Testing Laboratories: Provides internationally recognized procedures for laboratories conducting strength testing on drawbar couplings and eyes.

Related Standards

  • ISO 3584 – Road vehicles - Drawbar couplings - Interchangeability
  • ISO 1102 – Commercial road vehicles - 50 mm drawbar eye - Interchangeability
  • ISO 8755 – Commercial road vehicles - 40 mm drawbar eye - Interchangeability
  • ISO 1176 – Road vehicles - Masses - Vocabulary and codes

These related standards complement ISO 8718 by addressing interchangeability requirements and definitions essential to the design and testing of coupling components.


Keywords: ISO 8718, drawbar couplings, drawbar eyes, hinged drawbars, strength tests, road vehicles, dynamic test, static test, D-value, towing vehicle, trailer connection, vehicle safety, commercial vehicles, component interchangeability, mechanical testing, couplings strength standard.

Standard

ISO 8718:2001 - Road vehicles -- Drawbar couplings and eyes for hinged drawbars -- Strength tests

English language
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Standard

ISO 8718:2001 - Véhicules routiers -- Pivots et anneaux pour barres d'attelage articulées -- Essais de résistance

French language
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Frequently Asked Questions

ISO 8718:2001 is a standard published by the International Organization for Standardization (ISO). Its full title is "Road vehicles - Drawbar couplings and eyes for hinged drawbars - Strength tests". This standard covers: This International Standard specifies strength test conditions and requirements for the 40 mm and 50 mm drawbar couplings and corresponding drawbar eyes for hinged drawbars. NOTE See ISO 3584 [1] for couplings, and ISO 1102 [2] and ISO 8755 [3] for eyes.

This International Standard specifies strength test conditions and requirements for the 40 mm and 50 mm drawbar couplings and corresponding drawbar eyes for hinged drawbars. NOTE See ISO 3584 [1] for couplings, and ISO 1102 [2] and ISO 8755 [3] for eyes.

ISO 8718:2001 is classified under the following ICS (International Classification for Standards) categories: 43.040.70 - Couplings. The ICS classification helps identify the subject area and facilitates finding related standards.

ISO 8718:2001 has the following relationships with other standards: It is inter standard links to ISO 8718:1988. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

You can purchase ISO 8718:2001 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of ISO standards.

Standards Content (Sample)


INTERNATIONAL ISO
STANDARD 8718
Second edition
2001-12-15
Road vehicles — Drawbar couplings and
eyes for hinged drawbars — Strength tests
Véhicules routiers — Pivots et anneaux pour barres d'attelage articulées —
Essais de résistance
Reference number
©
ISO 2001
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©  ISO 2001
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body
in the country of the requester.
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ii © ISO 2001 – All rights reserved

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 3.
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 International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 8718 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 8718:1988), which has been technically revised.
INTERNATIONAL STANDARD ISO 8718:2001(E)

Road vehicles — Drawbar couplings and eyes for hinged
drawbars — Strength tests
1 Scope
This International Standard specifies strength test conditions and requirements for the 40 mm and 50 mm drawbar
couplings and corresponding drawbar eyes for hinged drawbars.
[1] [2] [3]
NOTE See ISO 3584 for couplings, and ISO 1102 and ISO 8755 for eyes.
2 Normative reference
The following normative document contains provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard
...


NORME ISO
INTERNATIONALE 8718
Dexième édition
2001-12-15
Véhicules routiers — Pivots et anneaux
pour barres d'attelage articulées — Essais
de résistance
Road vehicles — Drawbar couplings and eyes for hinged drawbars —
Strength tests
Numéro de référence
©
ISO 2001
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©  ISO 2001
Droits de reproduction réservés. Sauf prescription différente, aucune partie de cette publication ne peut être reproduite ni utilisée sous quelque
forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les microfilms, sans l'accord écrit de l’ISO à
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Fax. + 41 22 749 09 47
E-mail copyright@iso.ch
Web www.iso.ch
Imprimé en Suisse
ii © ISO 2001 – Tous droits réservés

Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes nationaux de
normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est en général confiée aux
comités techniques de l'ISO. Chaque comité membre intéressé par une étude a le droit de faire partie du comité
technique créé à cet effet. Les organisations internationales, gouvernementales et non gouvernementales, en
liaison avec l'ISO participent également aux travaux. L'ISO collabore étroitement avec la Commission
électrotechnique internationale (CEI) en ce qui concerne la normalisation électrotechnique.
Les Normes internationales sont rédigées conformément aux règles données dans les Directives ISO/CEI, Partie 3.
La tâche principale des comités techniques est d'élaborer les Normes internationales. Les projets de Normes
internationales adoptés par les comités techniques sont soumis aux comités membres pour vote. Leur publication
comme Normes internationales requiert l'approbation de 75 % au moins des comités membres votants.
L'attention est appelée sur le fait que certains des éléments de la présente Norme internationale peuvent faire
l'objet de droits de propriété intellectuelle ou de droits analogues. L'ISO ne saurait être tenue pour responsable de
ne pas avoir identifié de tels droits de propriété et averti de leur existence.
La Norme internationale ISO 8718 a été élaborée par le comité technique ISO/TC 22, Véhicules routiers,
sous-comité SC 15, Interchangeabilité des composants des véhicules utilitaires et autobus.
Cette deuxième édition annule et remplace la première édition (ISO 8718:1988) qui a fait l'objet d'une révision
technique.
NORME INTERNATIONALE ISO 8718:2001(F)

Véhicules routiers — Pivots et anneaux pour barres d'attelage
articulées — Essais de résistance
1 Domaine d'application
La présente Norme internationale spécifie les conditions d’essai de résistance et les exigences de résistance des
pivots de 40 mm et de 50 mm et des anneaux de remorquage correspondants pour les barres d’attelage articulées.
[1] [2] [3]
NOTE Voir l’ISO 3584 pour les pivots, l’ISO 1102 et l’ISO 8755 pour les anneaux de remorquage.
2 Référence normative
Le document normatif suivant contient des dispositions qui, par suite de la référence qui y est faite, constituent des
dispositions valables pour la présente Norme internationale. Pour les références datées, les amendements
ultérieurs ou les révisions de cette publication ne s’appliquent pas. Toutefois, le
...

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