Steel 1020 sub od 8853 type a grade 2 alternate qq-s-631c1020, over-all length 7.714 in. Od, of small end 1.625 in. Od oflarge end 1.811 in. Plus 0.000 in. Minus 0.001 in., in-side ofboth ends 1-3-16-12 unc-2b, protective coating mil-p-16232type m class 2 all over