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 Vehicle - Mechanical Coupling Between Articulated Vehicle Combinations.
You must comply with this standard if you intend to manufacture or modify a heavy vehicle that was built after June 1991 and will be used in a road train.
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.
