2a thread class right-hand 0.293" thread length oval countersunk head style 32 thread quantity per inch navy special project chromate or cadmium screw surface treated unc thread series
2a thread class right-hand 1.189" thread length flat countersunk head style 18 thread quantity per inch cadmium screw surface treated unc thread series
3a thread class right-hand 0.397" thread length flat countersunk head style 0.125" grip length 28 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.467" thread length flat countersunk head style 0.500" grip length 24 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.400" thread length dished hexagon head style 0.802" grip length 28 thread quantity per inch passivate surface treated unjf thread series