This document specifies dimensions of ball-bearing turntable when mounted on a vehicle which is part of vehicle combinations specified in of ISO 18868:2013, Clause 4, to ensure their interchangeability.
This document also applies to the following:
— drawbar trailers using a ball-bearing turntable to steer the front axle;
—ball-bearing turntables assembled with the fifth-wheel of the road tractor (truck) to improve steering manoeuvre.
BSI recommends this version of standard for organisations operating in or with the UK. The ISO edition is available here if required.