3a thread class right-hand 0.177" thread length headless (setscrew) head style 32 thread quantity per inch navy special project passivate surface treated unf thread series
Used on an/apr-38. 2a thread class right-hand 0.230" thread length headless (setscrew) head style 56 thread quantity per inch silver surface treated uns thread series
3a thread class right-hand 0.302" thread length headless (setscrew) head style 28 thread quantity per inch passivate surface treated unjf thread series