HILLMAN 1/4-20 in. Zinc-Plated Steel USS Hex Nut 3380 pkGrade 2 Hex Nuts are to be used with machine bolts to adhere facing materials in order to prevent tension and shear movement. Zinc grade 2 steel hex nuts are recommended for most general uses and are corrosion resistant. CORROSION RESISTANT FINISH: Zinc plating offers moderate protection against rust and corrosion 1 4" 20 USS COARSE THREAD: Matches bolts or rods of a 1 4" 20 coarse thread size DO NOT OVERTIGHTEN: Overtightening risks stripping of