3a thread class right-hand 0.625" thread length hexagon head style 32 thread quantity per inch passivate surface treated concentric hole threaded unf thread series
2a thread class right-hand 1.505" thread length flat countersunk head style 56 thread quantity per inch passivate screw surface treated unc thread series
3a thread class right-hand 0.481" thread length hexagon head style 0.070" hole diameter 28 thread quantity per inch phosphate surface treated unjf thread series