This Standard specifies the essential dimensions of am 50 mm drawbar coupling and a 50 mm drawbar eye to permit interchangeability between towing vehicles and trailers equipped with these connections.
DIN 74053-1:1994 history
1994DIN 74053-1:1994-11 Mechanical connections between towing vehicles and trailers - 50 mm drawbar-eye - Part 1: With sleeve
1994DIN 74053-1:1994 Mechanical connections between towing vehicles and trailers - 50 mm drawbar-eye - Part 1: With sleeve