Import Astm A563 Heavy Hex Nuts — Buy in Bulk from Supplier in China

ASTM A563 heavy hex nuts are carbon steel fasteners designed for high-pressure bolting applications, meeting the ASTM A563 standard for chemical composition and mechanical properties. The nuts are machined to precise dimensional tolerances, ensuring compatibility with heavy hex bolts in structural and industrial assemblies. This listing specifies carbon steel as the base material, with surface treatments available to enhance corrosion resistance for outdoor or harsh environments.

The nuts are manufactured to Grade DH, a common variant under ASTM A563 that provides a balance of strength and ductility for general-purpose use. Typical industry practice includes heat treatment to achieve uniform hardness, with a standard Rockwell hardness range of B70-B100 for Grade DH. Threads are cut to ASME B1.1 standards, ensuring consistent pitch and engagement with mating bolts, while the heavy hex geometry offers a larger bearing surface than standard nuts to distribute clamping forces evenly.

These nuts are used in construction for steel frameworks, in machinery for high-load joints, and in automotive for chassis and suspension systems. Buyers source them in bulk for projects requiring reliable, repeatable fastening under vibration or dynamic loads. Trade terms such as MOQ, packaging, and incoterms are not specified in the listing, so importers should confirm these details directly with Ningbo S&D Metal Work Co.,Ltd for accurate logistics planning.

Ningbo S&D Metal Work Co.,Ltd is based in Ningbo, Zhejiang Province, with its office and production address at No.691-1, Tiantong, Dongwu. The company operates as an importer-tier supplier, specializing in industrial fasteners and metal components for international markets. Its harbor trust tier indicates a baseline level of verification for trade operations, though the listing does not provide details on certifications or production capacity.

The supplier’s profile does not include a recorded response rate or average response time, which may require direct contact for timely inquiries. The company’s focus appears to be on providing standard-compliant fasteners like ASTM A563 heavy hex nuts, with the listing emphasizing compliance to industry standards as a key selling point. No additional claims about certifications, client base, or production history are made in the provided data.