2a thread class right-hand 0.650" thread length hexagon head style 20 thread quantity per inch navy special project cadmium surface treated concentric hole unthreaded unc thread series
2a thread class 1.062" thread length hexagon head style 1.438" grip length 18 thread quantity per inch cadmium or zinc surface treated unc thread series
2a thread class 1.062" thread length hexagon head style 0.188" grip length 18 thread quantity per inch cadmium or zinc surface treated unc thread series