2a thread class right-hand 0.313" thread length double chamfer head style 32 thread quantity per inch passivate screw surface treated unc thread series
2a thread class right-hand 0.157" thread length undercut pan no. 2 head style 40 thread quantity per inch passivate screw surface treated unc thread series
2a thread class right-hand 0.375" thread length flat countersunk undercut head style 56 thread quantity per inch passivate screw surface treated unc thread series
2a thread class right-hand 0.151" thread length flat countersunk undercut head style 56 thread quantity per inch passivate screw surface treated unc thread series
Used on coast guard hu25 aircraft engine. 3a thread class right-hand 1.545" thread length flat fillister head style 32 thread quantity per inch unjf thread series
3a thread class right-hand 0.308" thread length flat countersunk undercut head style 56 thread quantity per inch passivate screw surface treated unjc thread series
3a thread class right-hand 0.300" thread length flat countersunk undercut head style 32 thread quantity per inch passivate screw surface treated unjf thread series