nickel copper alloy,qq-n-281 cl a,overall; 0.8690 in. min,0.8700 in. max bore w/flat spot on either side; 1.6790 in. min,1.6820 in. max body od; 1.5200 in. nom o/a lg,2.7500 in. nom flange od,0.1450 nom flange w; flange notched 2 places; surface finish 63 microinches o/a general characteristics item description