3a thread class right-hand 2.803" thread length crowned hexagon head style 0.046" hole diameter 28 thread quantity per inch passivate surface treated unf thread series
2a thread class right-hand 1.500" thread length hexagon head style 1.000" grip length 11 thread quantity per inch furnished with hex nut unc thread series
3a thread class right-hand 1.621" thread length dished hexagon head style 4.240" grip length 12 thread quantity per inch navy special project cadmium surface treated unf thread series