3a thread class right-hand 0.403" thread length flat countersunk head style 0.250" grip length 28 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.469" thread length dished hexagon head style 3.302" grip length 24 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 0.397" thread length flat countersunk undercut head style 0.875" grip length 28 thread quantity per inch oversize grip dia passivate surface treated unjf thread series
flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style head has raised dot, height 0.020; chemical conversion coating.
3a thread class right-hand 0.363" thread length flat countersunk head style 32 thread quantity per inch cadmium screw surface treated unjc thread series