2a thread class right-hand 0.750" thread length hexagon head style 0.500" grip length 20 thread quantity per inch cadmium surface treated unc thread series
3a thread class right-hand 0.620" thread length hexagon head style 0.047" hole diameter 0.248" grip length 32 thread quantity per inch unjf thread series
3a thread class right-hand 0.500" thread length hexagon head style 1.422" grip length 24 thread quantity per inch passivate surface treated unf thread series