3a thread class right-hand 0.400" thread length hexagon head style 0.047" hole diameter 32 thread quantity per inch cadmium surface treated unf thread series
2a thread class right-hand 0.332" thread length flat chamfer head style 0.062" hole diameter 28 thread quantity per inch passivate surface treated unf thread series
Used on spec item. 3a thread class right-hand 1.250" thread length headless (setscrew) head style 28 thread quantity per inch cadmium surface treated unf thread series
3a thread class right-hand 0.250" thread length headless (setscrew) head style 40 thread quantity per inch cadmium or chromate zinc surface treated unc thread series