Matl steel per ams 6272; hardness per rockwell c20 min and c40 max; tin flash per ams 2408 all over except id; 1.0 in. Lond; body 2.7505 in. Min and 2.7515 in. Max od; flange 4.438 in. Od with 8 holes 0.2656 in. Dia; bore 2.4995 in. Min and 2.5005 in. Max dia