3a thread class right-hand 0.500" thread length flat countersunk head style 32 thread quantity per inch cadmium screw surface treated unc thread series
3a thread class right-hand 0.188" thread length flat countersunk head style 56 thread quantity per inch navy special project zinc screw surface treated unf thread series
3a thread class right-hand 0.405" thread length flat countersunk head style 24 thread quantity per inch cadmium screw surface treated unc thread series
2a thread class right-hand 0.609" thread length flat countersunk head style 32 thread quantity per inch phosphate zinc screw surface treated unf thread series
3a thread class right-hand 0.080" thread length flat countersunk head style 56 thread quantity per inch chromate zinc screw surface treated unc thread series
2a thread class right-hand 0.312" thread length hexagon head style 32 thread quantity per inch silver screw surface treated 0.093 in. dia unc thread series