3a thread class right-hand 0.515" thread length crowned hexagon head style 0.688" grip length 24 thread quantity per inch cadmium surface treated unf thread series
2a thread class right-hand 0.831" thread length round extended washer head style 24 thread quantity per inch cadmium screw surface treated unc thread series
3a thread class right-hand 0.813" thread length square head style 0.120" hole diameter 24 thread quantity per inch passivate surface treated unc thread series