ISO 11407:2004 PDF

Commercial road vehicles — Mechanical coupling between towing vehicles, with coupling mounted forward and below, and centre-axle trailers — Interchangeability

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Title (English):

ISO 11407:2004

Commercial road vehicles — Mechanical coupling between towing vehicles, with coupling mounted forward and below, and centre-axle trailers — Interchangeability

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 9
Publication date:: October 29, 2004
Edition:: ISO IS 11407 edition 2 version 1
ICS:: 43.040.70

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Description (English):

ISO 11407:2004 specifies the interchangeability requirements -- 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 applicable to dedicated or special combinations such as coupling systems with an extensible drawbar; nor does it specify limitations on 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 11407:2004

Abstract

Overview

ISO 11407:2004 - "Commercial road vehicles - Mechanical coupling between towing vehicles, with coupling mounted forward and below, and centre-axle trailers - Interchangeability" specifies dimensional and interchangeability requirements for mechanical drawbar couplings used between towing vehicles (with the coupling mounted forward and below) and centre-axle trailers. The standard targets road trains carrying low‑density, high‑volume cargo and covers the geometry, classes and marking needed to ensure safe, interchangeable coupling across manufacturers and operators.

Key topics and requirements

Interchangeability dimensions - Defines the key parameter A (distance between drawbar coupling axis and rear end of towing vehicle) in class values: 1 400 mm, 1 600 mm, 1 900 mm (low/high classes).
Turning front (C) - Minimum front clearance C is calculated from vehicle width (W), A and a minimum safety clearance S. Practical form:
- C_min = sqrt(A^2 + (W/2)^2) + S
- Recommended minimum S = 250 mm (365 mm gives additional margin).
Coupling heights and drawbar contour - Specifies coupling and towing‑eye heights for laden vehicles and drawbar geometry. Notes that drawbar‑eye dimensions reference ISO 1102, though centre‑axle trailers may need reinforced eyes.
Rear end configurations - Distinguishes high and low rear‑end classes (low for vehicles fitted with tail lifts or extra equipment). Figures define permissible contours and clearances.
Angles and articulation - Requires no contact for inclination α up to 6°; articulation angle β up to 90° must be permitted under manoeuvring.
Marking - Vehicles and trailers should carry a permanent 150 × 150 mm plate indicating class/dimension A to ensure easy recognition and correct matching.
Scope limits - Not applicable to dedicated/special combinations (e.g., extensible drawbars), nor does it set gross mass or overall dimension limits (these are legislative).

Applications and users

Who uses it:
- Vehicle and trailer manufacturers, chassis and drawbar designers
- Fleet operators and logistics companies specifying interchangeable road train equipment
- Type‑approval bodies, procurement teams and test laboratories
Practical uses:
- Designing centre‑axle trailers and towing vehicles to be interoperable across fleets
- Specifying coupling geometry to avoid interference with tail lifts and overhang equipment
- Ensuring safe clearance and articulation for mixed combinations and multi‑trailer road trains

Related standards

ISO 1102 - 50 mm drawbar eye interchangeability (referenced for drawbar‑eye dimensions)
ISO 11406 - Mechanical coupling for rear‑mounted couplings and drawbar trailers (different coupling location)

Keywords: ISO 11407:2004, commercial road vehicles, mechanical coupling, centre‑axle trailers, drawbar coupling, interchangeability, drawbar eye, road train.

Related standards

Mentioned in the description and other ISO standards

Abstract

Overview

Key topics and requirements

Interchangeability dimensions - Defines the key parameter A (distance between drawbar coupling axis and rear end of towing vehicle) in class values: 1 400 mm, 1 600 mm, 1 900 mm (low/high classes).
Turning front (C) - Minimum front clearance C is calculated from vehicle width (W), A and a minimum safety clearance S. Practical form:
- C_min = sqrt(A^2 + (W/2)^2) + S
- Recommended minimum S = 250 mm (365 mm gives additional margin).
Coupling heights and drawbar contour - Specifies coupling and towing‑eye heights for laden vehicles and drawbar geometry. Notes that drawbar‑eye dimensions reference ISO 1102, though centre‑axle trailers may need reinforced eyes.
Rear end configurations - Distinguishes high and low rear‑end classes (low for vehicles fitted with tail lifts or extra equipment). Figures define permissible contours and clearances.
Angles and articulation - Requires no contact for inclination α up to 6°; articulation angle β up to 90° must be permitted under manoeuvring.
Marking - Vehicles and trailers should carry a permanent 150 × 150 mm plate indicating class/dimension A to ensure easy recognition and correct matching.
Scope limits - Not applicable to dedicated/special combinations (e.g., extensible drawbars), nor does it set gross mass or overall dimension limits (these are legislative).

Applications and users

Who uses it:
- Vehicle and trailer manufacturers, chassis and drawbar designers
- Fleet operators and logistics companies specifying interchangeable road train equipment
- Type‑approval bodies, procurement teams and test laboratories
Practical uses:
- Designing centre‑axle trailers and towing vehicles to be interoperable across fleets
- Specifying coupling geometry to avoid interference with tail lifts and overhang equipment
- Ensuring safe clearance and articulation for mixed combinations and multi‑trailer road trains

Related standards

ISO 1102 - 50 mm drawbar eye interchangeability (referenced for drawbar‑eye dimensions)
ISO 11406 - Mechanical coupling for rear‑mounted couplings and drawbar trailers (different coupling location)

Keywords: ISO 11407:2004, commercial road vehicles, mechanical coupling, centre‑axle trailers, drawbar coupling, interchangeability, drawbar eye, road train.

ISO 11407:2004 PDF

Technical details

Abstract

Overview

Key topics and requirements

Applications and users

Related standards

Related standards

Abstract

Overview

Key topics and requirements

Applications and users

Related standards

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