ISO 337:1981
(Main)Road vehicles - 50 semi-trailer fifth wheel coupling pin - Basic and mounting/interchangeability dimensions
Road vehicles - 50 semi-trailer fifth wheel coupling pin - Basic and mounting/interchangeability dimensions
This second edition cancels and replaces the first edition (1973). Specifies the dimensions of the 50 coupling pin /dia. 50,8 mm (2 in)/ which is used for coupling semi-trailers to prime movers, taking into account the limitations of weight generally laid down by official requirements. Some figures illustrate shapes and the difference of types.
Véhicules routiers — Pivot d'attelage de 50 pour semi-remorque — Dimensions de base et caractéristiques de montage et d'interchangeabilité
La présente norme internationale fixe les dimensions du pivot d'attelage de 50 [Ø 50,8 mm (2 in)], qui est utilisé pour tous les accouplements de semi-remorques avec tracteur, compte tenu des limitations de poids généralement imposées par les prescriptions réglementaires. Note : Si, pour les véhicules exceptionnellement lourds, ce pivot n'est pas suffisant, un pivot de 90 [Ø 89 mm (3,5 in)] conforme à l'ISO 4086 doit être utilisé. En outre, la présente norme internationale spécifie les caractéristiques dimensionnelles nécessaires au montage et à l'interchangeabilité.
General Information
- Status
- Published
- Publication Date
- 30-Nov-1981
- Current Stage
- 9093 - International Standard confirmed
- Start Date
- 24-Feb-2021
- Completion Date
- 13-Dec-2025
Overview
ISO 337:1981 is an international standard developed by the International Organization for Standardization (ISO) that defines the basic and mounting/interchangeability dimensions of the 50 mm (2 inch) fifth wheel coupling pin used in road vehicles. Specifically, it covers the coupling pins utilized to attach semi-trailers to prime movers. This second edition, issued in 1981, supersedes the original 1973 release, reflecting updated dimensional tolerances and practical application considerations. The standard ensures compatibility across manufacturers and facilitates safe, reliable semi-trailer coupling within the limits outlined by official weight regulations.
Key Topics
- Fifth wheel coupling pin dimensions: Specifies the critical dimensional parameters of the 50.8 mm (2 in) diameter coupling pin, including basic pin diameter, length, and tolerances critical for ensuring consistent functionality and safety.
- Mounting and interchangeability: Defines the necessary dimensional characteristics to allow interchangeability of coupling pins, supporting maintenance ease and vehicle compatibility.
- Types of coupling pins: Details two main types with illustrative figures-Type A and Type B-highlighting differences in pin dimensions and mounting profiles.
- Weight limitations: Acknowledges regulatory weight limits tied to the 50 mm standard pin and notes that heavier-duty applications should use the larger 90 mm (3.5 inch) pin as per ISO 4086.
- Dimensional tolerance control: Sets clear tolerances for new and existing pins, including dimensions to check before and after mounting for quality control.
Applications
ISO 337:1981 is essential for manufacturers, designers, and maintenance professionals working in the commercial road transport and vehicle manufacturing industries. Practical applications include:
- Semi-trailer manufacturing: Ensures that fifth wheel coupling pins produced by different suppliers fit universally to the prime movers, enabling smooth integration on assembly lines.
- Fleet maintenance and repair: Provides guidance for inspecting and replacing coupling pins, helping maintain vehicle safety and operational efficiency.
- Regulatory compliance: Helps operators and vehicle inspectors verify that coupling systems meet international size and interchangeability standards, supporting roadworthiness certifications.
- Component interchange: Facilitates the use of standardized parts across different vehicle makes and models to reduce inventory costs and downtime.
- Design of coupling systems: Assists engineers in setting dimensional constraints early in the design of new semi-trailers or towing vehicles, improving reliability and safety.
Related Standards
- ISO 4086: Defines the basic and mounting/interchangeability dimensions for the 90 mm (3.5 inch) semi-trailer fifth wheel coupling pin, used for extra heavy-duty vehicles requiring higher load capacities.
- Other ISO standards under Technical Committee ISO/TC 22: Covers complementary specifications related to road vehicle couplings, safety requirements, and vehicle dimensions ensuring integrated and harmonized standards within the road transport sector.
Adhering to ISO 337:1981 guarantees consistent, reliable, and safe semi-trailer connections by standardizing the critical dimensions of fifth wheel coupling pins, facilitating international interchangeability, and promoting regulatory compliance. This standard plays a crucial role in the efficiency and safety of road freight transportation logistics worldwide.
ISO 337:1981 - Road vehicles -- 50 semi-trailer fifth wheel coupling pin -- Basic and mounting/interchangeability dimensions
ISO 337:1981 - Véhicules routiers -- Pivot d'attelage de 50 pour semi-remorque -- Dimensions de base et caractéristiques de montage et d'interchangeabilité
ISO 337:1981 - Véhicules routiers -- Pivot d'attelage de 50 pour semi-remorque -- Dimensions de base et caractéristiques de montage et d'interchangeabilité
Frequently Asked Questions
ISO 337:1981 is a standard published by the International Organization for Standardization (ISO). Its full title is "Road vehicles - 50 semi-trailer fifth wheel coupling pin - Basic and mounting/interchangeability dimensions". This standard covers: This second edition cancels and replaces the first edition (1973). Specifies the dimensions of the 50 coupling pin /dia. 50,8 mm (2 in)/ which is used for coupling semi-trailers to prime movers, taking into account the limitations of weight generally laid down by official requirements. Some figures illustrate shapes and the difference of types.
This second edition cancels and replaces the first edition (1973). Specifies the dimensions of the 50 coupling pin /dia. 50,8 mm (2 in)/ which is used for coupling semi-trailers to prime movers, taking into account the limitations of weight generally laid down by official requirements. Some figures illustrate shapes and the difference of types.
ISO 337:1981 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.
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Standards Content (Sample)
International Standard
INTERNATIONAL ORGANIZATION FOR STANDARDIZATlON.ME)I(~YHAPO~HAR OPI-AHM3ALWlR l-l0 CTAHfiAPTM3AlWl.ORGANlSATlON INTERNATIONALE DE NORMALISATION
- 50 semi-trailer fifth wheel coupling pin -
Road vehicles
Basic and mounting/interchangeability dimensions
V&kules rou tiers - Pivot d’attelage de 50 pour semi-remorque - Dimensions de base et caract&istiques de montage et
d’in terchangeabilit6
Second edition - 1981-12-01
UDC 629.11.013.5 : 629.114.3 Ref. No. ISO337-1981 (E)
Descriptors : road vehicles, semitrailers, couplings, pins, mountings, dimensions, dimensional tolerances, interchangeability.
Price based on 2 pages
Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
national standards institutes (IS0 member bodies). The work of developing Inter-
national Standards is carried out through IS0 technical committees. Every member
body interested in a subject for which a technical committee has been set up 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.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the IS0 Council.
International Standard IS0 337 was developed by Technical Committee ISO/TC 22,
Road vehicles, and was circulated to the member bodies in June 1980.
It has been approved by the member bodies of the following countries :
Austria India Poland
Belgium Iran Romania
Brazil Italy South Africa, Rep. of
Chile Japan Spain
China Korea, Dem. P. Rep. of Sweden
Czechoslovakia Korea, Rep. of Switzerland
France Netherlands United Kingdom
Germany, F. R. New Zealand USSR
The member body of the following country expressed disapproval of the document on
technical gro unds
Australia
T
...
Norme internationale
INTERNATIONAL ORGANIZATION FOR STANDARDIZATlONOMEIKflYHAPO~HAR OPrAHM3ALUlR ll0 CTAHAAPTM3AL&Wl~ORGANlSATlON INTERNATIONALE DE NORMALISATION
Pivot d’attelage de 50 pour
V6hicuIes routiers -
Dimensions de base et caractkistiques
semi-remorque -
de montage et d’interchangeabilit6
Basic and moun tins/in terchangeabilit y dimensions
Road vehicles - 50 semi- trailer fifth wheel coupling pin -
DeuxiBme Edition - 1981-12-01
R6f. no : IS0 337-1981 (F)
CDU 629.11.013.5 : 629.114.3
monture, dimension, tokance de dimension, interchangeabilitk
Descripteurs : vehicule routier, semi-remorque, accouplement, epingle,
Prix base sur 2 pages
Avant-propos
L’ISO (Organisation internationale de normalisation) est une federation mondiale
d’organismes nationaux de normalisation (comites membres de I’ISO). L’elaboration
des Normes internationales est confide aux comites techniques de I’ISO. Chaque
comite membre interesse par une etude a le droit de faire partie du comite technique
correspondant. Les organisations internationales, gouvernementales et non gouverne-
mentales, en liaison avec I’ISO, participent egalement aux travaux.
Les projets de Normes internationales adopt& par les comites techniques sont soumis
aux comites membres pour approbation, avant leur acceptation comme Normes inter-
nationales par le Conseil de I’ISO.
La Norme internationale IS0 337 a ete elaboree par le comite technique ISO/TC 22,
Vdhicules routiers, et a ete soumise aux comites membres en juin 1980.
Les comites membres des pays suivants I’ont approuvee :
Pays- Bas
Afrique du Sud, Rep. d’ Coree, Rep. dem. p. de
Pologne
Allemagne, R. F. Espagne
France Roumanie
Autriche
lnde Royaume-Uni
Belgique
Suede
Bresil Iran
ltalie Suisse
Chili
Tchecoslovaquie
Chine Japon
Nouvelle-Zelande URSS
Coree, Rep. de
Organisation internationale de normalisation, 1981
Imprim en Suisse
...
Norme internationale
INTERNATIONAL ORGANIZATION FOR STANDARDIZATlONOMEIKflYHAPO~HAR OPrAHM3ALUlR ll0 CTAHAAPTM3AL&Wl~ORGANlSATlON INTERNATIONALE DE NORMALISATION
Pivot d’attelage de 50 pour
V6hicuIes routiers -
Dimensions de base et caractkistiques
semi-remorque -
de montage et d’interchangeabilit6
Basic and moun tins/in terchangeabilit y dimensions
Road vehicles - 50 semi- trailer fifth wheel coupling pin -
DeuxiBme Edition - 1981-12-01
R6f. no : IS0 337-1981 (F)
CDU 629.11.013.5 : 629.114.3
monture, dimension, tokance de dimension, interchangeabilitk
Descripteurs : vehicule routier, semi-remorque, accouplement, epingle,
Prix base sur 2 pages
Avant-propos
L’ISO (Organisation internationale de normalisation) est une federation mondiale
d’organismes nationaux de normalisation (comites membres de I’ISO). L’elaboration
des Normes internationales est confide aux comites techniques de I’ISO. Chaque
comite membre interesse par une etude a le droit de faire partie du comite technique
correspondant. Les organisations internationales, gouvernementales et non gouverne-
mentales, en liaison avec I’ISO, participent egalement aux travaux.
Les projets de Normes internationales adopt& par les comites techniques sont soumis
aux comites membres pour approbation, avant leur acceptation comme Normes inter-
nationales par le Conseil de I’ISO.
La Norme internationale IS0 337 a ete elaboree par le comite technique ISO/TC 22,
Vdhicules routiers, et a ete soumise aux comites membres en juin 1980.
Les comites membres des pays suivants I’ont approuvee :
Pays- Bas
Afrique du Sud, Rep. d’ Coree, Rep. dem. p. de
Pologne
Allemagne, R. F. Espagne
France Roumanie
Autriche
lnde Royaume-Uni
Belgique
Suede
Bresil Iran
ltalie Suisse
Chili
Tchecoslovaquie
Chine Japon
Nouvelle-Zelande URSS
Coree, Rep. de
Organisation internationale de normalisation, 1981
Imprim en Suisse
...
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