Used on crane-shovel,trk med,20 ton,quickway mdl m202;2320-01-097-0248,2320-01-097-0249,2320-01-100-7672,2320-01-097-0260,2320-01-195-7641 hemtt (heavy expanded mobility tactical trucks). weapon system essential zinc surface treated N1 outside hexagon or octagon (partial or full thread optional)