3a thread class right-hand 0.490" thread length headless (setscrew) head style 32 thread quantity per inch passivate fastener surface treated unc thread series
2a thread class right-hand 0.125" thread length fillister head style 0.037" hole diameter 40 thread quantity per inch passivate surface treated unc thread series
3a thread class right-hand 0.410" thread length headless (setscrew) head style 0.046" hole diameter 32 thread quantity per inch hex 0.110 min unf thread series
Used on cobra helicopter. right-hand 0.375" thread length headless (setscrew) head style 40 thread quantity per inch passivate surface treated uns thread series
3a thread class right-hand 0.178" thread length headless (setscrew) head style 40 thread quantity per inch passivate surface treated unjc thread series