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 - Mechanical coupling between articulated vehicle combinations Design criteria and selection requirements for fifth wheel, kingpin and associated equipment.
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 B-double. A B-double is a vehicle consisting of a prime-mover, and two trailers.
The fifth wheel kingpins of the B-double must meet the relevant rating and dimensional requirements set out in 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.
