BS AU 2a:1970

This standard BS AU 2a:1970 Specification for dimensions of 3½ - 4½ in diameter fifth wheel king pin for use with extra heavy duty semi-trailers is classified in these ICS categories:

• 43.080.10 Trucks and trailers
• 43.040.70 Couplings

This British Standard specifies dimensions for a 3½ – 4½ in diameter king pin for fifth wheel attachment to semi-trailers for extra heavy duty.

NOTE 1 A fifth wheel king pin for attachment to semi-trailers for normal and heavy duty is covered in BS AU 1, “Dimensions of 2 – 2⅞ in diameter fifth wheel king pin for use with semi-trailers”. The clearance dimensions and fifth wheel positions are given in BS AU 3, “Clearance dimensions and fifth wheel positions for tractors and semi-trailers”.

NOTE 2 The values specified in imperial units are to be regarded as the standard.