Used on mrap - cougar. 3a thread class right-hand 0.375" thread length headless (setscrew) head style 20 thread quantity per inch cadmium surface treated unc thread series
2a thread class right-hand 1.125" thread length flat countersunk head style 20 thread quantity per inch phosphate screw surface treated 0.062 in. radius on edge of head unf thread series
2a thread class right-hand 0.430" thread length headless (setscrew) head style 18 thread quantity per inch 0.500 in. dia of unthded portion of shank phosphate surface treated unf thread series