3a thread class right-hand 1.000" thread length hexagon head style 0.093" hole diameter 16 thread quantity per inch 0.187 in. dia by 0.171 in. deep axially drilled hole in head cadmium surface treated 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 0.500" thread length flat countersunk head style 16 thread quantity per inch cadmium screw surface treated unc thread series
2a thread class right-hand 0.125" thread length flat chamfer head style 36 thread quantity per inch phosphate screw surface treated grip diameter uns thread series
3a thread class right-hand 0.900" thread length flat chamfer head style 16 thread quantity per inch shank relieved under head 0.10 in. porm .010 w to 0.30 in. plus .000, minus .010 dia unc thread series
2a thread class right-hand 0.340" thread length flat chamfer head style 32 thread quantity per inch zinc screw surface treated 30 deg chamfer on underside of head unc thread series
