2a thread class right-hand hexagon head style 18 thread quantity per inch 0.109 in. min, 0.141 in. max dia; 0.173 in. min, 0.203 in. max length between threads cadmium surface treated unc thread series
3a thread class right-hand 0.506" thread length flat countersunk head style 1.178" grip length 24 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.506" thread length flat countersunk head style 1.052" grip length 24 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.506" thread length flat countersunk head style 0.928" grip length 24 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.746" thread length flat chamfer head style 0.036" hole diameter 40 thread quantity per inch cadmium surface treated unc thread series
2a thread class right-hand 0.087" thread length flat countersunk undercut head style 32 thread quantity per inch paint screw surface treated unc thread series
3a thread class right-hand 0.881" thread length double hexagon w/hole head style 0.350" hole diameter 1.428" grip length 20 thread quantity per inch navy special project unjf thread series
3a thread class right-hand 0.391" thread length flat countersunk head style 0.740" grip length 24 thread quantity per inch navy special project cadmium surface treated unjf thread series
3a thread class right-hand 0.428" thread length flat countersunk head style 0.802" grip length 20 thread quantity per inch navy special project cadmium surface treated unjf thread series
Used on aircraft phantom f-4. 3a thread class right-hand 0.364" thread length double hexagon head style 1.615" grip length 24 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 0.505" thread length flat countersunk head style 2.052" grip length 24 thread quantity per inch cadmium surface treated unf thread series
3a thread class right-hand 0.469" thread length hexagon head style 0.812" grip length 28 thread quantity per inch passivate surface treated unf thread series
3a thread class right-hand 0.375" thread length button head style 32 thread quantity per inch navy special project passivate screw surface treated unf thread series