3a thread class right-hand 0.450" thread length pan head style 40 thread quantity per inch zinc screw surface treated n-d vibra-tite coated unc thread series
2a thread class right-hand 1.761" thread length flat countersunk head style 40 thread quantity per inch passivate screw surface treated unc thread series
3a thread class right-hand 1.433" thread length flat countersunk head style 32 thread quantity per inch passivate screw surface treated unjc thread series
3a thread class right-hand 0.277" thread length flat countersunk head style 32 thread quantity per inch cadmium screw surface treated unjc thread series
2a thread class right-hand 0.108" thread length flat countersunk head style 80 thread quantity per inch navy special project cadmium screw surface treated unf thread series