3a thread class right-hand 0.531" thread length hexagon head style 0.072" hole diameter 24 thread quantity per inch 0.0531 in. w groove underhead cadmium surface treated unf thread series
3a thread class right-hand 0.520" thread length headless (setscrew) head style 32 thread quantity per inch four grooves 0.054in. dp equally spaced unef thread series
Used on spec item. 3a thread class right-hand 1.724" thread length headless (setscrew) head style 20 thread quantity per inch cadmium surface treated unf thread series