Used on F-16. 3a thread class right-hand 0.407" thread length flat chamfer head style 0.038" hole diameter 32 thread quantity per inch unjf thread series
3a thread class right-hand 0.250" thread length flat countersunk head style 56 thread quantity per inch passivate screw surface treated unc thread series
3a thread class right-hand 0.188" thread length flat countersunk head style 40 thread quantity per inch passivate screw surface treated unc thread series
3a thread class right-hand 0.500" thread length flat countersunk head style 40 thread quantity per inch passivate screw surface treated unc thread series
3a thread class right-hand 1.000" thread length flat countersunk head style 40 thread quantity per inch passivate screw surface treated unc thread series
2a thread class right-hand 0.748" thread length flat countersunk undercut head style 20 thread quantity per inch zinc screw surface treated unc thread series