2a thread class right-hand 0.371" thread length fillister head style 56 thread quantity per inch navy special project cadmium screw surface treated unc thread series
2a thread class right-hand 0.076" thread length flat countersunk undercut head style 24 thread quantity per inch passivate screw surface treated unc thread series
2a thread class right-hand 1.500" thread length flat countersunk head style 36 thread quantity per inch passivate screw surface treated unf thread series
3a thread class right-hand 0.208" thread length fillister head style 48 thread quantity per inch navy special project passivate screw surface treated unc thread series
3a thread class right-hand 0.270" thread length fillister head style 48 thread quantity per inch navy special project passivate screw surface treated unc thread series
3a thread class right-hand 0.333" thread length fillister head style 48 thread quantity per inch navy special project passivate screw surface treated unc thread series