3a thread class right-hand 0.968" thread length flat countersunk head style 40 thread quantity per inch passivate screw surface treated unjc thread series
3a thread class right-hand 0.387" thread length flat chamfer head style 24 thread quantity per inch cadmium fastener surface treated unjc thread series
3a thread class right-hand 0.405" thread length hexagon head style 4.938" grip length 20 thread quantity per inch cadmium surface treated unf thread series