3a thread class right-hand headless (setscrew) head style 18 thread quantity per inch hollow setscrew; two slots 90 degrees apart, 0.060 in. radius by 0.060 in. depth unf thread series
3a thread class right-hand 0.680" thread length headless (setscrew) head style 20 thread quantity per inch hollow setscrew; two slots 90 degrees apart, 0.060 in. radius by 0.060 in. depth unf thread series
3a thread class right-hand 0.375" thread length headless (setscrew) head style 32 thread quantity per inch phosphate zinc surface treated unc thread series