nickel copper alloy,qq-n-281,class a; elongated bore,0.8750 in. min,0.8760 in. max major dia; 0.6870 in. min,0.6880 in. max minor dia; 1.6790 in. min,1.6820 in. max body dia; 1.8906 in. nom o/a lg; 2.7500 in. nom dia flange; pointer on flange general characteristics item description