BS AU 1c:1989

This standard BS AU 1c:1989 Specification for dimensions of '50' fifth wheel king pin for semi-trailers is classified in these ICS categories:

• 43.040.70 Couplings
• 43.080.10 Trucks and trailers

This International Standard specifies the dimensions of the 50 [ϕ 50,8 mm (2 in)] fifth wheel coupling pin which is used for coupling semi-trailers to prime movers, taking into account the limitations of weight generally laid down by official requirements.

NOTE If, for extra heavy-duty vehicles, this coupling pin is not sufficient, an 90 [ϕ 89 mm (3.5 in)] fifth wheel coupling pin according to ISO 4086 shall be used.

In addition, this International Standard specifies the dimensional characteristics necessary for mounting and interchangeability.

Basic, mounting and interchangeability dimensions.