flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 0.469" grip length "u" denotes single action fasteners installed with a single action tool cadmium sleeve surface treated
3a thread class right-hand 4.780" thread length flat chamfer head style 0.061" hole diameter 16 thread quantity per inch cadmium surface treated unc thread series
3a thread class right-hand 1.880" thread length flat chamfer head style 0.061" hole diameter 13 thread quantity per inch cadmium surface treated unc thread series
3a thread class right-hand 0.787" thread length bevel-conical head style 0.055" hole diameter 20 thread quantity per inch cadmium surface treated unf thread series
3a thread class right-hand 0.670" thread length hexagon head style 20 thread quantity per inch navy special project thread relief length MIN0.050, MAX0.100 unjf thread series