3a thread class right-hand 0.866" thread length flat countersunk head style 32 thread quantity per inch passivate screw surface treated unjc thread series
2a thread class right-hand 0.330" thread length flat countersunk head style 40 thread quantity per inch passivate screw surface treated unc thread series
3a thread class right-hand 0.508" thread length flat countersunk head style 40 thread quantity per inch cadmium screw surface treated unjc thread series
3a thread class right-hand 0.516" thread length flat countersunk head style 20 thread quantity per inch cadmium screw surface treated unjf thread series