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Industrial Hex Nuts: Materials and Applications ​A Hex Nut is a six-sided threaded fastener used with a bolt or screw to secure parts together. The hexagonal shape is intentional, providing multiple angles for a wrench or tool to grip, which makes it easier to apply torque in tight spaces. ​Material Grades and Specifications ​Choosing the right material is critical because a nut's performance depends entirely on its environment (heat, chemicals, or tension). Material Category Specific Grades Key Characteristics Stainless Steel SS 304 / 316 / 310 304 is standard for general use; 316 adds molybdenum for marine/chloride resistance; 310 is designed for high-heat environments. Inconel 600, 625, 718 Nickel-chromium alloys that maintain strength at extreme temperatures and resist oxidation. Titanium Grade 2, Grade 5 Exceptional strength-to-weight ratio and highly resistant to saltwater and chlorine. Monel 400, K-500 A nickel-copper alloy specifically resistant to seawater and hydrofluoric acid. Hastelloy C-276, C-22 Known as a "superalloy," it offers the best possible resistance to severe corrosion and acids.