Matl copper alloy per ams 4630; hardness per rockwell b77; all dimensions based on full circle; body 7.288 in. Min and 7.290 in. Max od; flange 7.4375 in. Od; bore 5.875 in. Dia; counterbore 6.999 in. Dia; 4 holes 0.377 in. Dia; 4 holes 0.078125 in. Dia; 3 holes threaded 0.25-28nf-2