Material cres a1s1 303 mil-s-7720comp 303s cond annealed, finish passivate in a/w mil-f-14072, e300, head width 0.245 in., head height 0.656 in., hole in head through diameter 0.1568 in., dia of alinment pin 0.2500 in. 2 places, shank length 0.438 in., shank thread 10-32 unf-2a