ISO 12357-2:2007 lays down test conditions and strength requirements to be met by:

1. drawbar couplings and corresponding drawbar eyes for rigid drawbars which are provided for use on rigid drawbar trailers with a maximum design total mass exceeding 3,5 tonnes and
   • a vertical static load exceeding 10 % of their design total mass, and/or
   • a vertical static load greater than 1 000 kg and up to 2 000 kg;
2. drawbar couplings and corresponding drawbar eyes for use on vehicle transport combinations, provided for a technical mass exceeding 3,5 tonnes.