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USA Grade C Heavy Hex Nut, A563, Plain
USA-made Heavy Hex Nuts A563 Grade C Plain are high-strength carbon steel fasteners manufactured in compliance with ASTM A563 Grade C specifications. Designed for structural steel and heavy-duty applications, these nuts feature a thicker body and larger flats than standard hex nuts, providing superior load-bearing capacity and reliable torque performance. The plain (uncoated) finish offers a natural steel surface suitable for indoor use or post-application coatings such as galvanizing or plating.
Produced in the USA for dependable quality and consistency, A563 Grade C Heavy Hex Nuts are commonly paired with high-strength structural bolts like ASTM A325 and A490. Heat-treated for added strength and durability, they ensure secure fastening in bridges, buildings, and industrial assemblies. The plain finish makes them ideal for applications where corrosion protection will be added later or is not required.
