Used on hemtt family (heavy expanded mobility tactical trucks). 3a thread class right-hand headless (setscrew) head style 28 thread quantity per inch cadmium surface treated unf thread series
3a thread class right-hand hexagon head style 0.033" hole diameter 28 thread quantity per inch navy special project chromate surface treated unf thread series
3a thread class right-hand 0.302" thread length headless (setscrew) head style 40 thread quantity per inch passivate surface treated unjc thread series