Steel, mil-s-5626 comp 4140; rockwell c scale 32 min, 35 max hardness; 2.123 in. Min, 2.125 in. Max od flange, 0.121 in. Min, 0.126 in. Max thk flange; 1.2495 in. Min, 1.2500 in. Max od body; 0.280 in. Min, 0.283 in. Max o/a lg; 1.001 in. Min, 1.002 in. Max diameter bore; counterbored at flanged end, 0.040 in. Min, 0.042 in. Max lg by 1.273 in. Min, 1.278 in. Max diameter counterbore; 2 holes 0.125 in. Nom diameter through flange located 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 0.069 in. Min, 0.075 in. Max dp keyway
