3a thread class right-hand headless (setscrew) head style 40 thread quantity per inch l 0.437 in; locking element area must pass thru a ring gage equal to major thd dia 0.003 in freely or with finger pressure unc thread series
3a thread class right-hand headless (setscrew) head style 20 thread quantity per inch navy special project passivate fastener surface treated unrc thread series
3a thread class right-hand headless (setscrew) head style 20 thread quantity per inch full dog point dia 0.149 in. min 0.156 in. max, point lth 0.120 in. min 0.130 in. max; color black oxide surface treated unc thread series
