This part of ISO5692 specifies the requirements for vehicle coupling rings with a ring inside diameter of 40mm for coupling with the drawbar coupling specified in ISO6489-2, and for ensuring vehicle coupling with the necessary horizontal and vertical rotation angle.
This part of ISO5692 is applicable to couplings where the vertical static load is not more than 2000kg and the dynamic horizontal load is not more than the D value of 120kN.
NOTE For value D, see ISO6489-2.