3a thread class right-hand 0.900" thread length flat chamfer head style 28 thread quantity per inch navy special project internal drive on thd end unf thread series
2a thread class right-hand 4.804" thread length flat countersunk head style 32 thread quantity per inch cadmium screw surface treated unc thread series
3a thread class right-hand 0.500" thread length flat countersunk head style 28 thread quantity per inch passivate screw surface treated unf thread series
3a thread class right-hand 0.609" thread length flat countersunk head style 24 thread quantity per inch passivate screw surface treated unf thread series
3a thread class right-hand 0.202" thread length flat countersunk head style 32 thread quantity per inch navy special project passivate screw surface treated unjf thread series
3a thread class right-hand 0.689" thread length flat countersunk head style 20 thread quantity per inch cadmium screw surface treated unjf thread series