3a thread class right-hand 0.375" thread length headless (setscrew) head style 16 thread quantity per inch cadmium or zinc surface treated unc thread series
2a thread class right-hand 0.125" thread length flat chamfer head style 24 thread quantity per inch drilled hole along center line of point 0.250 in. dia by 0.156 in. deep passivate surface treated unf thread series