Retaining Rings and Washers Retaining Rings Click the ASME inch or DIN retaining ring point object from the Hardware Inch/Metric or Hardware ISO/DIN tool set to insert a retaining ring. Parameter Description Type Select the retaining ring type Inch DIN Size (mm) Select the retaining ring size in millimeters View Select the 2D view Place Locus at Center Select to add a locus at the center of the retaining ring