3a thread class right-hand 0.425" thread length dished hexagon head style 2.240" grip length 28 thread quantity per inch chromate surface treated unjf thread series
3a thread class right-hand 0.308" thread length flat countersunk head style 0.490" grip length 32 thread quantity per inch cadmium or cadmium surface treated unjf thread series
3a thread class right-hand 0.425" thread length hexagon head style 2.625" grip length 28 thread quantity per inch drilled hole in head passivate surface treated unjf thread series