2a thread class right-hand 0.719" thread length pan head style 32 thread quantity per inch passivate screw surface treated paint top of head per 133C133, cagec 97942 unc thread series
3a thread class right-hand 0.401" thread length flat countersunk head style 28 thread quantity per inch cadmium screw surface treated unjf thread series
3a thread class right-hand 0.276" thread length flat countersunk head style 32 thread quantity per inch passivate screw surface treated unjf thread series