Steel, mil-s-5626 comp 4140; rockwell c scale 32 min, 35 max hardness; 2.125 in. Nom od; 1.002 in. Min, 1.004 in. Max id; 2 holes 0.125 in. Nom diameter through body 180.0 degrees apart on 1.420 in. Nom bolt circle dia; 1 keyway located on id, 0.126 in. Min, 0.128 in. Max w by 0.066 in. Min, 0.075 in. Max dp keyway
