2a thread class right-hand 0.469" thread length flat countersunk head style 20 thread quantity per inch passivate screw surface treated unc thread series
3a thread class right-hand 0.170" thread length flat countersunk head style 32 thread quantity per inch navy special project cadmium screw surface treated unjc thread series
3a thread class right-hand 0.719" thread length flat countersunk head style 24 thread quantity per inch cadmium screw surface treated unjf thread series