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Hex Nuts are used for fastening to a hex head cap screw or bolt when mechanically joining materials together. Grade 5 hex nuts are medium strength for applications requiring higher load, tensile or shear strength such as children's playgrounds. Made from medium carbon steel, quenched and tempered for higher strength. Steel is zinc plated for moderate protection against rust. Use grade 5 hex nuts with grade 5 hex head cap screws or hex bolts.