Cres, ams5643; rockwell c scale 44 min, 48 max hardness; 1.160 in. Nom od; 0.7489 in. Min, 0.7493 in. Max id; 0.250 in. Nom thk tapered at 10 degrees angle to 0.200 in. Nom thk at outer edge; 1 circular groove located on outer periphery, 1.100 in. Nom diameter by 0.100in. Nom radius groove
