2a thread class right-hand 0.095" thread length hexagon head style 40 thread quantity per inch navy special project oxide screw surface treated unc thread series
3a thread class right-hand 0.438" thread length undercut universal head style 32 thread quantity per inch nickel screw surface treated unf thread series
2a thread class right-hand 0.438" thread length undercut universal head style 32 thread quantity per inch nickel screw surface treated unc thread series