3a thread class right-hand 0.459" thread length flat countersunk head style 56 thread quantity per inch cadmium screw surface treated unc thread series
3a thread class right-hand 0.250" thread length headless (setscrew) head style 32 thread quantity per inch color black oxide surface treated unc thread series
3a thread class right-hand 1.240" thread length double hexagon w/hole head style 18 thread quantity per inch hole in head can have flat, spherical or conical bottom; hole in head dia 0.440 in. unjf thread series
3a thread class right-hand 0.331" thread length dished hexagon head style 1.375" grip length 24 thread quantity per inch detent ring in shank cadmium surface treated unjf thread series
3a thread class right-hand 0.710" thread length dished hexagon head style 0.052" grip length 20 thread quantity per inch cadmium surface treated unjf thread series