2a thread class right-hand 0.538" thread length flat countersunk head style 56 thread quantity per inch passivate screw surface treated unc thread series
2a thread class right-hand 0.491" thread length flat countersunk head style 40 thread quantity per inch passivate screw surface treated unc thread series
3a thread class right-hand 0.781" thread length flat countersunk head style 20 thread quantity per inch cadmium screw surface treated unjf thread series
2a thread class right-hand 0.397" thread length flat countersunk head style 32 thread quantity per inch cadmium screw surface treated unc thread series
3a thread class right-hand 0.413" thread length flat countersunk undercut head style 24 thread quantity per inch cadmium screw surface treated unjf thread series
3a thread class right-hand 0.938" thread length flat countersunk head style 32 thread quantity per inch cadmium screw surface treated unjc thread series
2a thread class right-hand 0.312" thread length flat countersunk head style 32 thread quantity per inch passivate screw surface treated furnished with one silicone rubber o-ring, bearing surface of head undercut to accomodate o-ring unc thread series