3a thread class left-hand flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 0.251" grip length 40 thread quantity per inch 0.1964 in. second shank diameter passivate surface treated unf thread series
3a thread class right-hand 0.287" thread length oval countersunk head style 0.115" grip length 32 thread quantity per inch aluminum surface treated unjf thread series
3a thread class right-hand 0.616" thread length flat countersunk head style 0.990" grip length 24 thread quantity per inch aluminum surface treated unjf thread series
3a thread class right-hand 0.616" thread length flat countersunk head style 0.802" grip length 24 thread quantity per inch aluminum surface treated unjf thread series
3a thread class right-hand 0.444" thread length oval countersunk head style 0.178" grip length 28 thread quantity per inch aluminum surface treated unjf thread series
3a thread class right-hand 0.268" thread length double hexagon head style 0.740" grip length 28 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 0.345" thread length dished hexagon head style 3.865" grip length 28 thread quantity per inch cadmium surface treated unjf thread series
2a thread class right-hand 0.900" thread length round head style 20 thread quantity per inch navy special project cadmium screw surface treated unc thread series
