3a thread class right-hand 0.320" thread length undercut hexagon head style 4.365" grip length 32 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 0.275" thread length flat chamfer head style 28 thread quantity per inch passivate fastener surface treated unf thread series
3a thread class right-hand 0.444" thread length undercut hexagon head style 2.802" grip length 24 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 0.616" thread length double hexagon head style 5.688" grip length 20 thread quantity per inch navy special project cadmium or cadmium surface treated unjf thread series