Table of Contents

1 -  AS 4177.3-2004 CARAVAN AND LIGHT TRAILER TOWING COMPONENTS - COUPLING BODY FOR BALL COUPLINGS
4 -  PREFACE
5 -  CONTENTS
6 -  1 SCOPE
6 -  2 REFERENCED DOCUMENTS
6 -  3 DEFINITIONS
6 -  3.1 Aggregate trailer mass
6 -  3.2 Coupling
6 -  3.3 Coupling body
7 -  3.4 Drawbar
7 -  3.5 Gross trailer mass
7 -  3.6 Shall
7 -  3.7 Shank-type towball
7 -  3.8 Should
7 -  3.9 Towball
7 -  3.10 Towbar
7 -  3.11 Towing lug
7 -  4 RATING
7 -  5 DESIGN AND CONSTRUCTION
7 -  5.1 General
8 -  5.2 Locking onto the towball
8 -  5.3 Angles of movement
8 -  5.4 Dimensions for interchangeability
8 -  6 FINISH
8 -  6.1 General
8 -  6.2 Working surface
9 -  6.3 Protective coatings
9 -  7 PERFORMANCE REQUIREMENTS
9 -  7.1 General
9 -  7.2 Static test
9 -  7.3 Dynamic test
9 -  7.4 Ball pull-out test
9 -  8 MARKING
9 -  9 INSTALLATION REQUIREMENTS
10 -  APPENDIX A - STATIC TEST
10 -  A1 SCOPE
10 -  A2 PRINCIPLE
10 -  A3 APPARATUS
10 -  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

Abstract

Specifies the classification, design, interchangeability dimensions with tolerances, finish and marking requirements for coupling bodies for 50mm towballs, intended for trailers and caravans up to 3.5t aggregate trailer mass, for use on public roads.

Scope

This Standard specifies requirements for coupling bodies for ball couplings suitable for use with 50 mm towballs complying with AS 4177.2, for trailers and caravans up to 3.5 t aggregate trailer mass, for use on public roads.
The method of determining the static strength of a coupling body and its attachments to the trailer drawbar and towball is given in Appendix A and the dynamic strength is given in Appendix B.
NOTES:
1 Towbars and towballs are specified in AS 4177.1 and AS 4177.2 respectively.
2 The requirements for off-road applications are beyond the scope of this Standard.
3 Three rating classes are specified in this Standard, i.e. Type 750 kg, Type 2000 kg, and Type 3500 kg.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Standards Australia
Pages
ISBN
Committee	ME-052
Supersedes	AS 4177.3-1994 DR 03262