3a thread class right-hand headless (setscrew) head style 20 thread quantity per inch hole in threaded area 0.109 in. dia cadmium or zinc surface treated unf thread series
Used on mhu-196/204/m. 2a thread class right-hand headless (setscrew) head style 12 thread quantity per inch adjusting screw setscrew; steel; unf, rh thd series unf thread series