Import Astm A325 Type 1 Heavy Hex Bolts — Buy in wholesale FOB from Supplier in China

Ningbo Beilun Milfast Metalworks Co. Ltd manufactures ASTM A325 Type 1 heavy hex bolts from high-strength steel grade 10.9 carbon steel for structural steel connections in bridges, buildings and heavy machinery. These heavy hex head fasteners conform to ASTM A325 specifications for Type 1 materials, delivering tensile and shear strength suited to demanding load-bearing environments. The supplier offers sizes from M1.6 to M52 with surface treatments including zinc plated, plain finish, hot dip galvanized and self-color options. Standard export cartons or pallets are used for global distribution from their Ningbo facility in Zhejiang province.

The grade 10.9 designation indicates a minimum tensile strength of 1000 MPa and yield strength of 900 MPa, typical for medium-carbon alloy steel quenched and tempered to achieve these mechanical properties. ASTM A325 Type 1 specifically covers bolts made from medium-carbon or carbon-boron steel in the quenched and tempered condition, distinct from Type 3 which covers weathering steel compositions. The heavy hex head provides greater bearing surface than standard hex heads, reducing compressive stress on connected plates in structural joints. Surface treatments affect corrosion resistance: hot dip galvanizing offers sacrificial protection for outdoor exposure, while plain oil finishes suit protected interior applications where friction coefficient control matters for slip-critical connections.

These bolts serve structural steel fabricators, bridge contractors, heavy equipment manufacturers and construction firms requiring verified mechanical properties for safety-critical connections. Typical applications include beam-to-column connections, truss joints, crane runway installations and wind turbine tower sections where joint slip resistance must be engineered. Buyers should confirm thread pitch (UNC or UNF), grip length requirements and whether bolts will be used in shear or tension applications. The supplier states 100% production inspection and offers free samples for mechanical verification before bulk commitment.

Ningbo Beilun Milfast Metalworks Co. Ltd operates from Qijiashan Street in the Lianhe Area of Ningbo, Zhejiang province, postal code 315803. The supplier holds a harbor trust tier on the platform with a stated response rate of 0.00% and average response hours recorded at zero, indicating no response data is available through platform channels. Buyers should therefore initiate direct contact to assess communication reliability and English-language capability before relying on platform messaging alone.

The company positions itself as a manufacturer of high-strength fasteners with customizable options spanning multiple international standards including DIN, JIS, ANSI, ISO, GB and BSW. Their ASTM A325 Type 1 offering is complemented by user-specified material and grade selections (8.8, 10.9 and others). No information is provided about factory size, annual output, export license status, quality management system certifications, or client references. Buyers should verify manufacturing capability through factory audit, request mill test certificates for mechanical properties, and confirm whether the supplier holds direct ASTM certification or relies on third-party testing.