AS 4177.2-2004

1 - AS 4177.2-2004 CARAVAN AND LIGHT TRAILER TOWING COMPONENTS - 50 MM TOWBALLS
4 - PREFACE
5 - CONTENTS
6 - 1 SCOPE
6 - 2 REFERENCED DOCUMENTS
6 - 3 DEFINITIONS
6 - 3.1 Aggregate trailer mass
6 - 3.2 Ball coupling
7 - 3.3 Coupling
7 - 3.4 Coupling body
7 - 3.5 Drawbar
7 - 3.6 Gross trailer mass
7 - 3.7 Shall
7 - 3.8 Shank-type towball
7 - 3.9 Should
7 - 3.10 Towball
7 - 3.11 Towbar
7 - 3.12 Towing lug
7 - 3.13 Towing vehicle mass
7 - 4 DESIGN AND CONSTRUCTION REQUIREMENTS
7 - 4.1 Dimensions for interchangeability
7 - 4.2 Shank type towballs
8 - 4.3 Methods of attachment
8 - 5 FINISH
8 - 5.1 Surface roughness
8 - 5.2 Corrosion protection
8 - 6 PERFORMANCE REQUIREMENTS
8 - 6.1 General
9 - 6.2 Static test
9 - 6.3 Dynamic test
9 - 7 MARKING
11 - APPENDIX A - STATIC TEST
11 - A1 SCOPE
11 - A2 PRINCIPLE
11 - A3 APPARATUS
11 - A4 PROCEDURE
11 - A5 REPORT
13 - APPENDIX B - DYNAMIC TEST
13 - B1 SCOPE
13 - B2 PRINCIPLE
13 - B3 APPARATUS
13 - B4 PROCEDURE
14 - B5 REPORT

Specifies the requirements for towballs for towing vehicles of up to 5t towing vehicle mass, intended for towing trailers and caravans of up to 3.5t aggregate trailer mass for use on public roads.

This Standard specifies requirements for towballs for towing vehicles of up to 5 t towing vehicle mass. The towballs are intended for towing trailers and caravans of up to 3.5 t aggregate trailer mass, for use on public roads.The method of determining the static strength of a shank-type towball is given in Appendix A and the dynamic strength of a towball is given in Appendix B.NOTES:1 Towbars and coupling bodies are specified in AS 4177.1 and AS 4177.3 respectively. 2 Requirements for off-road applications are beyond the scope of this Standard. 3 Requirements for shank-type 50 mm towballs only are specified. 4 Towing bracket and towballs complying with ISO 1103 and ISO 3853 are also acceptable.

First published as part of AS D18-1968.
Revised and redesignated in part as AS 4177.2-1994.
Second edition 2004.