ISO 1726-1:2000 PDF

Road vehicles — Mechanical coupling between tractors and semi-trailers — Part 1: Interchangeability between tractors and semi-trailers for general cargo

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Title (English):

ISO 1726-1:2000

Road vehicles — Mechanical coupling between tractors and semi-trailers — Part 1: Interchangeability between tractors and semi-trailers for general cargo

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 8
Publication date:: May 18, 2000
Edition:: ISO IS 1726 edition 1 version 1
ICS:: 43.040.70

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Description (English):

This International Standard specifies dimensions to ensure interchangeability between a tractor vehicle and a coupled semi-trailer, the two together constituting an articulated vehicle. It specifies certain interchangeability dimensions, including those of the gooseneck contour, as well as operating dimensions related to angle values. The specifications permit the same semi-trailer to be used with either two- or three-axle tractors. Annex A gives interface technical specifications for tractors designed for towing high-cube semi-trailers, including ISO containers having an external height of 2,9 m. This International Standard covers articulated vehicles used in commercial cargo transport of the greatest possible variety. However, it may not be applicable to special combination types such as low-bed or tipper vehicles. This International Standard does not provide limitations of maximum gross mass and overall dimensions, which are generally laid down by legislative requirements.

Technical details

Technical committee: ISO/TC 22/SC 40 - Specific aspects for light and heavy commercial vehicles, busses and trailers
SKU: ISO 1726-1:2000

Abstract

Overview

ISO 1726 (published 2000) defines mechanical coupling and interchangeability dimensions between tractor units and semi‑trailers used in general cargo transport. Often referenced in product specifications and vehicle design literature as ISO 1726‑1:2000 (Interchangeability), the standard ensures that a given semi‑trailer can be safely and reliably coupled to different tractor types (two‑ or three‑axle) by specifying key geometry, clearances and operating angles.

Key topics and technical requirements

Fifth‑wheel heights
- Laden tractor: 1150 mm to 1300 mm above the ground reference plane (GRP).
- Uncoupled tractor: ≤ 1400 mm above GRP.
- Annex A (for high‑cube semi‑trailers/2.9 m ISO containers) relaxes these to 1025–1100 mm (laden) and ≤ 1150 mm (uncoupled).
Forward‑clearance zone
- Semi‑trailer forward clearance radius: ≤ 2040 mm to avoid interference with tractor rear components.
Gooseneck contour (geometry)
- Defined by three connected generator elements to prevent steps or discontinuities:
  - Length l = 750 mm
  - Inclination angle = 4°
  - Inner radius ≈ 450 mm, outer radius ≈ 2300 mm
Operating angles and articulation
- Inclination of semi‑trailer relative to tractor: 6° forward, 7° rearward
- Lateral inclination: ≤ 3° without contact
- Articulation: must allow contact‑free movement up to 25° (with specified angle transitions) and 90° under maneuvering conditions
Minimum clearances
- Free space between tractor and semi‑trailer: ≥ 100 mm (cylindrical clearance) and ≥ 80 mm at specified test point X

Applications and who uses this standard

ISO 1726 is used by:

Tractor and semi‑trailer manufacturers to design compatible coupling geometries
Vehicle OEMs and suppliers (fifth‑wheel and gooseneck designers)
Fleet operators and specifiers ensuring interchangeability across mixed fleets
Test labs, type‑approval authorities and compliance engineers verifying clearances and articulation limits
Design teams adapting tractors for high‑cube payloads (use Annex A)

Practical benefits include reduced coupling failures, safer maneuvering, simplified fleet matching of tractors and semi‑trailers, and clearer procurement specifications.

Related standards and notes

Normative reference: ISO 337 (semi‑trailer fifth wheel coupling pin dimensions)
ISO 1726 does not set maximum gross mass or overall vehicle dimensions - those are governed by national/regional legislation.
Conformance designations: ISO 1726‑S (standard) and ISO 1726‑A (Annex A high‑cube interface)

Keywords: ISO 1726, ISO 1726‑1:2000, mechanical coupling, tractors and semi‑trailers, gooseneck contour, fifth wheel height, interchangeability, articulated vehicle, high‑cube semi‑trailers.

Related standards

Mentioned in the description and other ISO standards

Abstract

Overview

Key topics and technical requirements

Fifth‑wheel heights
- Laden tractor: 1150 mm to 1300 mm above the ground reference plane (GRP).
- Uncoupled tractor: ≤ 1400 mm above GRP.
- Annex A (for high‑cube semi‑trailers/2.9 m ISO containers) relaxes these to 1025–1100 mm (laden) and ≤ 1150 mm (uncoupled).
Forward‑clearance zone
- Semi‑trailer forward clearance radius: ≤ 2040 mm to avoid interference with tractor rear components.
Gooseneck contour (geometry)
- Defined by three connected generator elements to prevent steps or discontinuities:
  - Length l = 750 mm
  - Inclination angle = 4°
  - Inner radius ≈ 450 mm, outer radius ≈ 2300 mm
Operating angles and articulation
- Inclination of semi‑trailer relative to tractor: 6° forward, 7° rearward
- Lateral inclination: ≤ 3° without contact
- Articulation: must allow contact‑free movement up to 25° (with specified angle transitions) and 90° under maneuvering conditions
Minimum clearances
- Free space between tractor and semi‑trailer: ≥ 100 mm (cylindrical clearance) and ≥ 80 mm at specified test point X

Applications and who uses this standard

ISO 1726 is used by:

Tractor and semi‑trailer manufacturers to design compatible coupling geometries
Vehicle OEMs and suppliers (fifth‑wheel and gooseneck designers)
Fleet operators and specifiers ensuring interchangeability across mixed fleets
Test labs, type‑approval authorities and compliance engineers verifying clearances and articulation limits
Design teams adapting tractors for high‑cube payloads (use Annex A)

Practical benefits include reduced coupling failures, safer maneuvering, simplified fleet matching of tractors and semi‑trailers, and clearer procurement specifications.

Related standards and notes

Normative reference: ISO 337 (semi‑trailer fifth wheel coupling pin dimensions)
ISO 1726 does not set maximum gross mass or overall vehicle dimensions - those are governed by national/regional legislation.
Conformance designations: ISO 1726‑S (standard) and ISO 1726‑A (Annex A high‑cube interface)

Keywords: ISO 1726, ISO 1726‑1:2000, mechanical coupling, tractors and semi‑trailers, gooseneck contour, fifth wheel height, interchangeability, articulated vehicle, high‑cube semi‑trailers.

ISO 1726-1:2000 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Applications and who uses this standard

Related standards and notes

Related standards

Abstract

Overview

Key topics and technical requirements

Applications and who uses this standard

Related standards and notes

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