2a thread class right-hand headless (setscrew) head style 14 thread quantity per inch spherical radius opposite threaded end. 0.190 diameter, 0.125 high. unc thread series
2a thread class right-hand 0.625" thread length hexagon head style 0.045" hole diameter 20 thread quantity per inch coat in accordance with mil-c-85614 using alumizite "z", supplied by tiodize, cage 34568 unc thread series
2a thread class right-hand 0.750" thread length headless (setscrew) head style 8 thread quantity per inch threaded center 0.250-20unc-2b 1.000 inch full thread unc thread series
Used on F100. 3a thread class right-hand 0.615" thread length headless (setscrew) head style 20 thread quantity per inch passivate surface treated unc thread series