3a thread class right-hand 0.875" thread length headless (setscrew) head style 20 thread quantity per inch 1 slot 0.088 in. min. 0.098 in. max. w by 0.312 in. lg. on slotted end of shank, 90 deg from drive slot unc thread series
2a thread class right-hand 0.500" thread length headless (setscrew) head style 16 thread quantity per inch 0.250 in. lg unthreaded portion of shank passivate surface treated unc thread series
2a thread class right-hand 0.070" thread length headless (setscrew) head style 64 thread quantity per inch navy special project passivate surface treated unf thread series