3a thread class right-hand 0.350" thread length flat countersunk head style 0.552" grip length 24 thread quantity per inch conical surface of head 32 microinches cadmium surface treated unjf thread series
2a thread class right-hand 0.208" thread length binding head style socket drive in threaded end 0.035 in. w across flats cadmium surface treated unf thread series
3a thread class right-hand 0.625" thread length hexagon head style 0.687" grip length 20 thread quantity per inch cadmium grip surface treated unf thread series