steel mil-s-6050 8630 cond f-4,0.917 in. o/a lg,0.730 in. body lg,0.187 in. flange lg,0.750 in. flange w across the flats,0.4982 in. min 0.4993 in. max body od,0.3762 in. min 0.3780 in. max id,32 microinch finish on body od,hex flange general characteristics item description