Import A325 Type1 Heavy Hex Bolts Hot Dipped Galv — Buy in wholesale FOB from Supplier in China

Ningbo S&D Metalwork Co., Ltd. supplies A325 Type 1 heavy hex bolts with hot-dipped galvanised finish, manufactured to ASTM A325 Type 1 mechanical and dimensional requirements. These bolts carry a minimum tensile strength of 120,000 psi and are available in diameters from 1/2 inch to 1-1/2 inch, with the heavy hex head providing approximately 33% more bearing surface than standard hex heads for improved load distribution in structural steel connections. The hot-dipped galvanisation process deposits a zinc coating of typically 50-85 microns, giving sacrificial corrosion protection suited to outdoor and marine atmospheric exposure.

The bolts are through-hardened medium carbon steel, typically 0.30-0.52% carbon content, quenched and tempered to achieve the specified mechanical properties. The heavy hex head geometry conforms to ASME B18.2.6, with head height and wrenching proportions designed for high-torque installation without rounding. Hot-dipped galvanising creates a metallurgically bonded zinc-iron alloy layer beneath pure zinc, giving better abrasion resistance than electroplated or mechanically deposited coatings. Buyers should specify thread class, as galvanised bolts typically carry 2A external threads that may require overtapping of the nut to accommodate coating thickness.

Primary applications include steel-to-steel structural connections in buildings, bridges, towers, and industrial frameworks where slip-critical or bearing-type joints are designed per AISC specifications. Contractors, structural steel fabricators, and infrastructure project procurement teams form the core buyer base. The supplier lists FOB and CIF terms, though specific Incoterms, MOQ, and lead times are not stated in the source material and should be confirmed directly with Ningbo S&D Metalwork Co., Ltd. before order commitment.

Ningbo S&D Metalwork Co., Ltd. is based in Yinzhou District, Ningbo, Zhejiang Province, China, a region with established metalworking and fastener manufacturing infrastructure. The supplier carries an imported tier classification and a harbor trust tier on the platform. Response rate is recorded at 0.00% with zero average response hours, indicating no historical inquiry response data is available through the platform interface. Buyers should initiate direct contact to assess communication reliability and sales support capability.

The listing presents Ningbo S&D Metalwork Co., Ltd. as a source for ASTM A325 structural bolts with hot-dipped galvanised finish, though no factory size, year of establishment, registered capital, workforce, revenue, specific certifications held, or named client references are provided in the source profile. The supplier does not claim ISO 9001, ISO 14001, or any third-party quality system registration within the disclosed material. Importers are advised to request a company profile, quality manual, and reference projects during supplier qualification.