2a thread class right-hand 0.250" thread length headless (setscrew) head style 16 thread quantity per inch oxide or cadmium surface treated unc thread series
3a thread class right-hand 0.630" thread length headless (setscrew) head style 16 thread quantity per inch locking feature in thread .125 in diameter unc thread series
3a thread class right-hand 0.366" thread length headless (setscrew) head style 32 thread quantity per inch cadmium fastener surface treated unc thread series
Used on spec item. 3a thread class right-hand 0.490" thread length headless (setscrew) head style 40 thread quantity per inch cadmium surface treated unc thread series