2a thread class right-hand 1.250" thread length hexagon extended washer head style 20 thread quantity per inch color black oxide surface treated unc thread series
Used on part of interior armor kit 2540-01-533-8813; nha nsn m915a3 armor kit 2540-01-523-1336; armored version of m915a3 2320-01-523-2486. 3a thread class right-hand 0.889" thread length hexagon head style 18 thread quantity per inch zinc surface treated unc thread series