Matl steel per ams 6272; hardness per rockwell c20 min and c40 max; 1 in. Long; body 2.7505 in. Min and 2.7515 in. Max od; flange 4.438 in. Od by 0.155 in. Min and 0.157 in. Max thick; 8 holes 0.2656 in. Dia; 4 holes 0.14 in. Dia; 6 holes 0.1562 in. Dia