2a thread class right-hand 0.520" thread length flat chamfer head style 18 thread quantity per inch navy special project passivate screw surface treated undercut 0.060" between thd unc thread series
3a thread class right-hand 0.476" thread length hexagon head style 32 thread quantity per inch cadmium screw surface treated 2 slots 180 degrees apart, 0.469 in. length unc thread series
3a thread class right-hand 0.438" thread length flat fillister head style 32 thread quantity per inch passivate screw surface treated unjf thread series