Steel, c1137 astm a108; 1.787 in. Outside dia: 1.285 in. Long; two external threads - 1.5-12unf-1alh, pitch diameter 1.4440 and 1.19-20uns-1a, pitch diameter 1.1561; two holes drilled, 0.21 in. Diameter x 0.13 in. Deep, 1.00 in. Apart from center to center; head used on fz bd m62a2