ISO 20019:2025
(Main)Agricultural vehicles - Mechanical connections on towed vehicles - Dimensions for hitch rings
Agricultural vehicles - Mechanical connections on towed vehicles - Dimensions for hitch rings
This document specifies dimensional requirements for the attachment of agricultural, non-balanced trailers and implements by means of hitch rings to the rear of towing vehicles equipped with a hook specified in ISO 6489-1. It ensures the interchangeability of the mechanical connections on agricultural towed vehicles. This document is applicable to rings whose coupling point is below the centre-line of the rear axle and the power take-off (PTO) of the tractor.
Véhicules agricoles — Liaisons mécaniques sur véhicules remorqués — Dimensions des anneaux d'attelage
La présente Norme internationale spécifie les dimensions de l'attelage des remorques agricoles semi-portées et des instruments agricoles attelés au moyen d'anneaux d'attelage à l'arrière du véhicule tracteur équipé d'un crochet d'attelage tel que spécifié dans l'ISO 6489-1. Elle a pour objet d'assurer l'interchangeabilité des liaisons mécaniques entre véhicules agricoles remorqués. La présente Norme internationale s'applique aux anneaux dont le point d'attelage est situé au-dessous de la ligne médiane de l'essieu arrière et au-dessous de la prise de force (p.d.f.) du tracteur. NOTE D'autres Normes internationales sont en cours d'élaboration pour les anneaux attelés au-dessus de la p.d.f.
General Information
- Status
- Published
- Publication Date
- 01-Oct-2025
- Technical Committee
- ISO/TC 23/SC 4 - Tractors
- Drafting Committee
- ISO/TC 23/SC 4/WG 8 - Power take-off (PTO) and drawbar
- Current Stage
- 6060 - International Standard published
- Start Date
- 02-Oct-2025
- Due Date
- 20-Mar-2026
- Completion Date
- 02-Oct-2025
Relations
- Effective Date
- 21-Sep-2024
Overview
ISO 20019:2025 - "Agricultural vehicles - Mechanical connections on towed vehicles - Dimensions for hitch rings" defines dimensional and functional requirements for hitch rings used to attach agricultural, non‑balanced trailers and implements to tractors. The standard ensures interchangeability of mechanical connections when used with tractor hooks specified in ISO 6489‑1, and applies to hitch rings whose coupling point lies below the centre‑line of the rear axle and the tractor power take‑off (PTO).
Key topics and requirements
- Scope and applicability
- Covers dimensional requirements for hitch rings on towed agricultural vehicles (non‑balanced trailers and implements).
- Applicable when the coupling point is below the rear axle centre‑line and the PTO.
- Interchangeability dimensions
- The hitch ring and shank must conform to the dimensions illustrated in the standard’s figures (see ISO 20019:2025 figures for precise millimetre values).
- Trailer shank travel angles
- Yaw: minimum ±60° rotation about a vertical axis through the coupling point.
- Pitch: minimum ±20° rotation about a horizontal axis perpendicular to the vehicle’s longitudinal plane; includes allowance for towing vehicle tilt of ±3° due to tyre size.
- Roll: minimum ±20° rotation about a horizontal axis in the vehicle’s plane of symmetry.
- Construction
- Hitch rings shall be substantially toroidal and fixed to the shank.
- Tractor hooks must permit the specified travel angles.
- The towed member (hitch ring and shank) may optionally allow up to 360° rotational freedom around the shank’s horizontal longitudinal axis; biasing or limiting roll is optional.
- Document changes
- Second edition (2025) cancels and replaces ISO 20019:2001, removing manufacturing requirements and revising hitch shank specifications.
Applications and users
ISO 20019:2025 is practical for anyone involved in the design, manufacture, selection, testing or regulation of tractor‑towed equipment:
- Tractor, trailer and implement manufacturers ensuring compatibility with standard tractor hooks.
- Agricultural equipment designers and product engineers specifying hitch geometry and clearances.
- Certification and testing bodies validating interchangeability and travel‑angle performance.
- Fleet managers, dealers and maintenance technicians selecting or retrofitting towed implements.
- Standards committees and procurement specialists referencing harmonized dimensions for tender specifications.
Related standards
- ISO 6489‑1 - Dimensions of hitch‑hooks (required mating component for tractors).
- Refer to ISO online resources for terminology and cross‑references.
Keywords: ISO 20019:2025, hitch rings, agricultural vehicles, mechanical connections, towed vehicles, interchangeability, hitch shank, tractor hook, trailer shank travel angles.
Frequently Asked Questions
ISO 20019:2025 is a standard published by the International Organization for Standardization (ISO). Its full title is "Agricultural vehicles - Mechanical connections on towed vehicles - Dimensions for hitch rings". This standard covers: This document specifies dimensional requirements for the attachment of agricultural, non-balanced trailers and implements by means of hitch rings to the rear of towing vehicles equipped with a hook specified in ISO 6489-1. It ensures the interchangeability of the mechanical connections on agricultural towed vehicles. This document is applicable to rings whose coupling point is below the centre-line of the rear axle and the power take-off (PTO) of the tractor.
This document specifies dimensional requirements for the attachment of agricultural, non-balanced trailers and implements by means of hitch rings to the rear of towing vehicles equipped with a hook specified in ISO 6489-1. It ensures the interchangeability of the mechanical connections on agricultural towed vehicles. This document is applicable to rings whose coupling point is below the centre-line of the rear axle and the power take-off (PTO) of the tractor.
ISO 20019:2025 is classified under the following ICS (International Classification for Standards) categories: 65.060.10 - Agricultural tractors and trailed vehicles. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 20019:2025 has the following relationships with other standards: It is inter standard links to ISO 20019:2001. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase ISO 20019:2025 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
Standard
ISO 20019
Second edition
Agricultural vehicles — Mechanical
2025-10
connections on towed vehicles —
Dimensions for hitch rings
Véhicules agricoles — Liaisons mécaniques sur véhicules
remorqués — Dimensions des anneaux d'attelage
Reference number
© ISO 2025
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Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Interchangeability dimensions . 1
4.1 General .1
4.2 Trailer shank travel angles .1
5 Construction . 2
Bibliography . 4
iii
Foreword
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