ISO 21244:2008 PDF

Name: ISO 21244:2008 — Agricultural equipment — Mechanical connections between towed and towing vehicles — Implement hitch rings and attachment to tractor drawbars
SKU: ISO 21244:2008
Price: 25 EUR
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Agricultural equipment — Mechanical connections between towed and towing vehicles — Implement hitch rings and attachment to tractor drawbars

Название (английский):

ISO 21244:2008

Agricultural equipment — Mechanical connections between towed and towing vehicles — Implement hitch rings and attachment to tractor drawbars

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 7
Дата публикации:: 20 мая 2008 г.
Издание:: ISO IS 21244 edition 1 version 1
ICS:: 65.060.10

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Описание (английский):

ISO 21244:2008 specifies dimensional requirements for the hitch rings of agricultural trailers and trailed implements designed to be attached to agricultural tractor drawbars according to ISO 6489-3.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 21244:2008 defines dimensional and articulation requirements for implement hitch rings used to connect agricultural trailers and trailed implements to tractor drawbars. The standard applies to implements intended for attachment to clevis-type tractor drawbars (as specified in ISO 6489-3) and groups hitches into six categories based on tractor PTO power and draft-load capacity.

Key topics and technical requirements

Scope: Dimensional requirements for hitch rings and ball‑ring hitches that mate with clevis drawbars.

Hitch categories: Six drawbar categories (0–5) determined by PTO power and draft loads (per ISO 6489-3). Category drives choice of ring or ball‑ring and the required dimensions.

Dimensional parameters: Values are given in the standard (Figures 1–2, Tables 1–2) for parameters such as slot length, slot width, maximum thickness, clearances and pin‑hole diameters. Example ranges across categories include:

Slot length (D): ~21–85 mm (varies by category)
Slot width (E): minimum 21–73 mm (by category)
Maximum thickness (F): ~30–60 mm
Ball thickness (K): ~45–95 mm for ball‑type rings
Drawpin hole diameter (L): ~19–71 mm
Pin diameter: specified per ISO 6489-3 (Table 4)

Articulation angles: Minimum articulation specified to ensure safe movement:

Angle of yaw (A): 90°
Angle of pitch (B): typically 20° for lower categories, 15° for higher categories
Angle of roll (C): typically 20° or 15° depending on category

Static vertical load & draft loads: Maximum static vertical load and draft capacity determine hitch category and suitability; calculation references ISO 6489-3 (Table 5).

Attachment limitation: The hitch design is intended only for connection to clevis-type drawbars.

Annex A: Informative table of permissible mechanical connection combinations between towing and towed vehicles.

Applications and users

ISO 21244:2008 is used by:

Agricultural equipment manufacturers (trailers, implements, hitch components) for design and production.

Tractor OEMs and drawbar designers to ensure compatibility with implement hitches.

Test laboratories and conformity assessment bodies verifying dimensional compliance and articulation.

Fleet managers, agricultural engineers and safety officers assessing coupling compatibility and safe towing configurations.

Benefits include improved interchangeability, safer mechanical connections between tractors and implements, and clearer selection criteria based on PTO power and draft load.

Related standards

Key related documents referenced by ISO 21244:

ISO 6489-3:2004 (Tractor drawbar - essential reference for drawbar dimensions and pin sizes)

ISO 5692‑1 / ISO 5692‑2 (hitch ring / coupling ring specifications)

ISO 24347 (ball‑type coupling device)

ISO 1102, ISO 8755, ISO 20019 and other parts of ISO 6489 for broader mechanical connection guidance

For implement and drawbar design or procurement, use ISO 21244 together with ISO 6489-3 to ensure compliant, compatible hitch connections.

ISO 21244:2008 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

ISO 6489-3:2004

Agricultural vehicles — Mechanical connections between towed and towing vehicles — Part 3: Tractor drawbar

ISO 6489-3:1992

Agricultural vehicles — Mechanical connections on towing vehicles — Part 3: Tractor drawbar

ISO 5692:1979

Agricultural vehicles — Mechanical connections on towed vehicles — Hitch-rings — Specifications

BS ISO 5692-2:2002

Agricultural vehicles. Mechanical connections on towed vehicles - Coupling ring 40 with socket

ISO 24347:2019

Agricultural vehicles — Mechanical connections between towed and towing vehicles — Dimensions of ball couplin…

BS ISO 11026:2010

Heavy commercial vehicles and buses. Test method for roll stability. Closing-curve test.

ISO 8755:1986

Commercial road vehicles — Mechanical connections between towing vehicles and trailers — 40 mm drawbar coupli…

ISO 20019:2025

Agricultural vehicles — Mechanical connections on towed vehicles — Dimensions for hitch rings