Used on F-4. 3a thread class right-hand 0.484" thread length hexagon head style 16 thread quantity per inch cadmium threads surface treated unf thread series
3a thread class right-hand 0.120" thread length flat chamfer head style 40 thread quantity per inch passivate screw surface treated slot in thd end unc thread series
2a thread class right-hand 0.450" thread length flat chamfer head style 24 thread quantity per inch six 0.040 in. dia holes in head equally spaced, head periphery undercut to 0.600 in. dia by 0.050 in. w located 0.062 in. from top, shoulder 0.412 in. dia by 0.075 in. w unf thread series
2a thread class right-hand 0.281" thread length knurled no. 4 head style 32 thread quantity per inch head straight knurled passivate surface treated unc thread series
2a thread class right-hand 0.178" thread length pan head style 32 thread quantity per inch point 0.609 in. min lg 0.641 in. max lg, point chamfer angle 15 deg passivate surface treated unc thread series
3a thread class right-hand 0.436" thread length hexagon head style 1.422" grip length 20 thread quantity per inch cadmium surface treated unf thread series
3a thread class right-hand 0.875" thread length flat chamfer head style 0.068" hole diameter 28 thread quantity per inch cadmium surface treated unf thread series
2a thread class right-hand 0.750" thread length flat chamfer head style 40 thread quantity per inch cadmium or chromate surface treated unc thread series
3a thread class right-hand 0.170" thread length flat chamfer head style 0.033" hole diameter 40 thread quantity per inch feature but does have other critical feature (s) such as tolerance, fit restrictions or application passivate surface treated unrc thread series
