Road vehicles - Fifth wheel kingpins - Strength test

This International Standard specifies strength test conditions and requirements for 50 and 90 fifth wheel kingpins. NOTE See ISO 337 [1] and ISO 4086 [2].

Véhicules routiers — Pivot d'attelage — Essai de résistance

La présente Norme internationale spécifie les conditions d'essai de résistance et les exigences de résistance des pivots d'attelage 50 et 90. NOTE Voir l'ISO 337 [1] et l'ISO 4086 [2].

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 8716:2001 specifies dynamic strength test conditions and requirements for 50 and 90 fifth wheel kingpins used on road vehicles. The standard defines how kingpins shall be mounted and tested on a dedicated test rig, how the comparative D value is determined from vehicle and trailer masses, and the acceptance criteria for resistance under cyclic horizontal loading. The objective is to verify durability, operational safety and interchangeability of kingpins for heavy trailers and semi-trailers.

Key Topics

  • Test method: A dynamic, sinusoidal strength test performed on a test bench. Tests must use fixation devices identical to the manufacturer’s mounting arrangement.
  • Mounting and accessories: Kingpins are tested separately (not together with fifth-wheel saddles) and must include the locking device specified by the standard.
  • D value determination: The D value is a comparative quantity calculated from the tractor and trailer masses and the vertical load, using the formula provided in the standard. The standard references g = 9.81 m/s² and aligns symbols with Directive 94/20/EC and UNECE R55 conventions.
  • Load application: A horizontal test force F_h,t is applied in one direction and then reversed; the point and direction of application are defined by the standard. The force amplitude varies between +0.6 D and −0.6 D.
  • Cycles and frequency: The dynamic test is sinusoidal and comprises 2 × 10^6 cycles. Test frequency must not exceed 25 Hz and must avoid the system’s natural frequency.
  • Acceptance criteria: The test must not produce permanent deformation, fracture or cracks in the kingpin.

Applications

ISO 8716:2001 is used by:

  • Manufacturers validating kingpin designs for heavy-duty vehicles and semi-trailers.
  • Quality assurance and type-approval testing to demonstrate compliance with international requirements.
  • Engineering and R&D teams assessing fatigue life and durability under realistic dynamic coupling loads.
  • Regulatory and conformity assessment bodies referencing a harmonized test method for interchangeability and safety verification.

Benefits of applying ISO 8716 include consistent test procedures across suppliers, provable resistance to cyclic coupling forces, and improved safety and reliability of trailer connections.

Related Standards

  • ISO 337 - Dimensions and mounting features for 50 mm kingpins (basic interchangeability and mounting guidance).
  • ISO 4086 - Interchangeability for 90 mm kingpins.
  • ISO 1176 - Vocabulary and mass codes for road vehicle mass definitions used in D value calculations.

For implementation, follow ISO 8716:2001 for test rig setup, D value calculation, and pass/fail criteria. Refer to the cited ISO documents for mounting dimensions and mass definitions to ensure complete conformity.

Standard

ISO 8716:2001 - Road vehicles -- Fifth wheel kingpins -- Strength test

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ISO 8716:2001 - Véhicules routiers -- Pivot d'attelage -- Essai de résistance

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Frequently Asked Questions

ISO 8716:2001 is a standard published by the International Organization for Standardization (ISO). Its full title is "Road vehicles - Fifth wheel kingpins - Strength test". This standard covers: This International Standard specifies strength test conditions and requirements for 50 and 90 fifth wheel kingpins. NOTE See ISO 337 [1] and ISO 4086 [2].

This International Standard specifies strength test conditions and requirements for 50 and 90 fifth wheel kingpins. NOTE See ISO 337 [1] and ISO 4086 [2].

ISO 8716:2001 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 8716:2001 has the following relationships with other standards: It is inter standard links to ISO 8716:1988. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

You can purchase ISO 8716:2001 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 8716
Second edition
2001-12-15
Road vehicles — Fifth wheel kingpins —
Strength test
Véhicules routiers — Pivot d'attelage — Essai de résistance

Reference number
©
ISO 2001
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©  ISO 2001
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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 8716 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 8716:1988), which has been technically revised.
INTERNATIONAL STANDARD ISO 8716:2001(E)

Road vehicles — Fifth wheel kingpins — Strength test
1 Scope
This International Standard specifies strength test conditions and requirements for 50 and 90 fifth wheel kingpins.
[1] [2]
NOTE See ISO 337 and ISO 4086 .
2 Normative reference
The following normative document contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subs
...


NORME ISO
INTERNATIONALE 8716
Deuxième édition
2001-12-15
Véhicules routiers — Pivot d'attelage —
Essai de résistance
Road vehicles — Fifth wheel kingpins — Strength test

Numéro de référence
©
ISO 2001
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©  ISO 2001
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Fax. + 41 22 749 09 47
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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 8716 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 8716:1988), qui a fait l'objet d'une révision
technique.
NORME INTERNATIONALE ISO 8716:2001(F)

Véhicules routiers — Pivot d'attelage — Essai de résistance
1 Domaine d'application
La présente Norme internationale spécifie les conditions d’essai de résistance et les exigences de résistance des
pivots d’attelage 50 et 90.
[1] [2]
NOTE Voir l’ISO 337 et l’ISO 4086 .
2 Référence normative
Le document normatif suivant contient des dispositions qui, par suite de la référence qui y est faite, constituent des
dispositions valable
...

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