2a thread class right-hand 0.250" thread length flat countersunk undercut head style 32 thread quantity per inch nickel screw surface treated unc thread series
3a thread class right-hand 0.188" thread length flat chamfer head style 0.047" hole diameter 40 thread quantity per inch passivate surface treated unc thread series
3a thread class right-hand 0.531" thread length hexagon head style 3.046" grip length 16 thread quantity per inch cadmium surface treated unjf thread series
2a thread class right-hand 0.324" thread length hexagon head style 24 thread quantity per inch navy special project cadmium or chromium surface treated unf thread series