2a thread class right-hand 2.834" thread length flat countersunk head style 10 thread quantity per inch passivate screw surface treated unc thread series
3a thread class right-hand 0.438" thread length flat chamfer head style 20 thread quantity per inch self locking device zinc surface treated unc thread series
flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 0.073" grip length anodize sleeve or chromate sleeve surface treated
Used on escher wyss c.p. propeller hubs on 378 ft coast guard vessels. 3a thread class right-hand 1.810" thread length fillister head style 13 thread quantity per inch unc thread series
2a thread class right-hand 0.450" thread length hexagon head style 28 thread quantity per inch navy special project cadmium surface treated unf thread series
3a thread class right-hand 0.425" thread length hexagon head style 1.312" grip length 28 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 0.469" thread length hexagon head style 1.062" grip length 24 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 0.735" thread length hexagon head style 1.938" grip length 20 thread quantity per inch cadmium surface treated unjf thread series
2a thread class right-hand 0.406" thread length pan no. 2 head style 24 thread quantity per inch navy special project passivate surface treated unf thread series