3a thread class right-hand 0.578" thread length dished hexagon head style 0.178" grip length 24 thread quantity per inch passivate surface treated unjf thread series
2a thread class right-hand 0.198" thread length flat countersunk head style 48 thread quantity per inch passivate screw surface treated unc thread series
3a thread class right-hand 0.276" thread length flat countersunk head style 1.240" grip length 32 thread quantity per inch cadmium surface treated unf thread series
3a thread class right-hand 0.350" thread length flat countersunk head style 1.490" grip length 24 thread quantity per inch passivate surface treated unjf thread series