ASTM A563M Heavy Hex Nuts

Description

Description

ASTM A563M Heavy hex Nut specification covers chemical and mechanical requirements for eight property classes of hex and hex-flange carbon and alloy steel.
These nuts for general structural and mechanical uses on bolts, studs, and other externally threaded parts.
Astm A563M Materials shall be tested and the individual grades shall conform to specified values of material such as hardness and proof load, chemical, and mechanical requirements. Classes 8S, 8S3 and 10S, 10S3 nuts have atmospheric corrosion resistance and weathering characteristics comparable to those of the steels. The atmospheric corrosion resistance of these steels is substantially better than that of carbon steel with or without copper addition. When properly exposed to the atmosphere, these steels can be used bare (un-coated) for many applications.

MKM Fasteners offers premium-grade ASTM A563M Heavy Hex Nuts, engineered for high-performance structural and mechanical applications. Manufactured from durable carbon steel and alloy steel, these nuts are designed to meet the rigorous requirements of today’s industrial and construction environments.

Available in sizes ranging from ½” to 2” in the Inch Series and M12 to M64 in the Metric Series, our heavy hex nuts come with surface finishes including Black and Hot-Dip Galvanized (HDG) to enhance corrosion resistance and longevity.

These nuts are produced as per ASTM A563/A563M CL 10S standards, ensuring strict compliance with chemical composition, mechanical properties, hardness, and proof load requirements. Suitable for use with bolts, studs, and other externally threaded components, they offer a secure and reliable fastening solution in both static and dynamic load conditions.

The Class 10S and 10S3 variants offer superior atmospheric corrosion resistance, making them ideal for exposed environments where structural elements are subject to moisture, temperature fluctuations, and industrial pollutants. These nuts are comparable to weathering steels in performance and, in many cases, can be used uncoated, reducing maintenance costs over time.

At MKM Fasteners, we maintain the highest manufacturing standards, with precision production and in-house testing to ensure every product meets or exceeds international benchmarks. Our heavy hex nuts conform to dimensional standards that guarantee a proper fit in structural connections and critical assemblies.

Whether for bridges, towers, heavy machinery, or steel structures, MKM Fasteners’ ASTM A563M Heavy Hex Nuts provide strength, reliability, and long-term performance you can trust.

Choose MKM Fasteners – your reliable partner in high-quality fastening solutions built to last.