Used on end item nsn: 3805-01-552-4485; skid steer loader, type ii. right-hand hex serrated flange nut-metric tempered to a surface hardness of 79 to 86 HR15n; core hardness is 25 to 34 hrc; material designated as special property class 8
Used on 2355-01-529-2246;casualty evac kit cat ii mrap. 17.0mm hole diameter washer, flat M16 plain finish; rockwell hardness not rated; for M16 screw size