Matl steel per ams 6440; hardness per rockwell c55 min and c58 max; 2.031 in. Long; body 3.7620 in. Min and 3.7628 in. Max od; flange 3.862 in. Min and 3.866 in. Max od; bore 0.75 in. Dia; counterbore 3.382 in. Min and 3.392 in. Max diameter by 1.855 in. Deep