Used on runway end indicator lights (reil). 3a thread class right-hand 0.438" thread length 24 thread quantity per inch concentric pin in top of head, 0.038 in.dia by 0.063 in.high unc thread series
2a thread class right-hand 0.143" thread length flat countersunk undercut head style 48 thread quantity per inch oxide screw surface treated unf thread series
2a thread class right-hand 0.875" thread length hexagon head style 0.062" hole diameter 24 thread quantity per inch zinc surface treated unf thread series
3a thread class right-hand 0.255" grip length 32 thread quantity per inch 125000 single pounds per square inch shear strength passivate surface treated unjf thread series
3a thread class right-hand 0.451" thread length 28 thread quantity per inch double lead modified minor dia. threads cadmium surface treated unf thread series
3a thread class right-hand 0.401" thread length flat countersunk head style 32 thread quantity per inch cadmium screw surface treated dull black color unichrome dip, bulletin 65-b-cd unjc thread series
3a thread class right-hand 0.608" thread length hexagon head style 2.922" grip length 24 thread quantity per inch passivate surface treated unf thread series
