Australian Standard AS 1771-1987 Installation of Fifth Wheel and Turn-Table - Australian Government


Note that this standard has been updated and you will need to meet the requirements set out in AS/NZS 4968.1:2023 Heavy road vehicles.

You may be required to comply with this standard if you operate a long distance interstate road transport business, and you intend to use a prime mover or semi-trailer.

Fifth wheel assemblies must be mounted on prime movers and semi-trailers according to the requirements of this standard.

This Standard sets out the attachment design forces for fifth wheel assembly and equations to determine the required D-value of components for various combinations. This standard applies to fifth wheel assemblies used with 50 mm, 75 mm and 90 mm kingpins, and associated equipment for articulated vehicle combination, used in heavy road vehicles, B-doubles and road trains, in normal use on both sealed and unsealed roads.


Service type

Code of Practice

A code of practice is a set of rules which details how people in a certain industry should behave. A code of practice can be defined as a result of legislation or by industry regulators and bodies.

Act(s) name

Road Vehicle Standards Act 2018 Australian Government

Regulation(s) name

Vehicle Standard (Australian Design Rule 62/00 - Mechanical Connections Between Vehicles) 2006 Australian Government

Administering agency

Department of Infrastructure, Transport, Regional Development, Communications and the Arts

Contact details

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