Used on part of the rear armor kit nsn 2540-01-533-8817; nha nsn m915a3 armor kit 2540-01-523-1336; armored version of m915a3 2320-01-523-2486. 8.4mm hole diameter washer, conical zinc surface treated
Used on part of the attaching hardware kit nsn 2540-01-533-9344; nha nsn m915a3 armor kit nsn 2540-01-523-1336; armored version of m915a3 nsn 2320-01. 8.4mm hole diameter washer, flat, metric, copper