2a thread class right-hand 0.438" thread length pan head style 32 thread quantity per inch navy special project nickel screw surface treated unf thread series
2a thread class right-hand 0.261" thread length flat countersunk head style 56 thread quantity per inch navy special project nickel screw surface treated unc thread series
2a thread class right-hand 0.157" thread length flat countersunk head style 64 thread quantity per inch cadmium screw surface treated unc thread series
3a thread class right-hand 1.218" thread length flat countersunk head style 40 thread quantity per inch passivate screw surface treated unjc thread series