04HN Standard Hex Nuts Essentra Components 04HN Standard Hex Nuts are non-conductive and offer corrosion resistance and a lasting hold. The hexagonal shape of these nuts features six flat sides, providing an easy way to tighten and loosen when using a standard wrench. Essentra Components 04HN Standard Hex Nuts are designed to either SAE imperial or metric sizes and are rated to UL 94V-2.