2a thread class right-hand 0.566" thread length hexagon head style 13 thread quantity per inch navy special project zinc surface treated unc thread series
2a thread class right-hand 1.340" thread length hexagon head style 20 thread quantity per inch navy special project zinc surface treated unf thread series
2a thread class right-hand 0.136" thread length hexagon head style 24 thread quantity per inch cadmium or phosphate zinc surface treated unc thread series
3a thread class right-hand 0.625" thread length hexagon head style 0.070" hole diameter 20 thread quantity per inch cadmium surface treated unf thread series
3a thread class right-hand 0.749" thread length hexagon head style 0.070" hole diameter 20 thread quantity per inch passivate surface treated unf thread series