2a thread class right-hand 1.440" thread length pan no. 2 head style 0.069" hole diameter 18 thread quantity per inch cadmium threads surface treated unc thread series
2a thread class right-hand 3.532" thread length headless (setscrew) head style 13 thread quantity per inch oxide or cadmium or chromate surface treated unc thread series
3a thread class right-hand 0.438" thread length headless (setscrew) head style 32 thread quantity per inch navy special project passivate surface treated unc thread series