Import A307 Gr. A Hex Lag Bolts Hex Lag Wood Bolts — Buy in wholesale FOB from Supplier in China

The A307 Gr. A Hex Lag Bolts from Ningbo S&D Metalwork Co., Ltd. are carbon steel fasteners conforming to ASTM A307 Grade A, a standard specification covering general purpose carbon steel bolts and studs with a minimum tensile strength of 60 ksi. These hex lag bolts feature a hexagonal head designed for wrench or socket drive installation and a coarse thread pattern optimised for gripping wood and structural timber. The Grade A designation indicates a lower strength level than Grade B, making these bolts suitable for non-critical, general applications rather than high-pressure or high-stress bolting. Surface treatment options enhance corrosion resistance for extended outdoor exposure, though the exact coating type from this supplier requires direct confirmation.

Carbon steel constitutes the base material, with typical compositions including low to medium carbon content to achieve the required mechanical properties while maintaining formability during thread rolling and heading operations. The hex lag screw configuration provides a large bearing surface under the head for distributing clamping load and resists wrench cam-out during installation. Standard dimensions follow inch-series thread specifications typical to ASTM fastener products, with diameters and lengths scaling to common construction and woodworking requirements. The coarse thread pitch relative to machine threads allows deeper penetration into wood grain with reduced stripping risk in softwood and engineered timber products.

Primary applications include timber framing, decking, structural wood connections, and heavy machinery assembly where the load demands do not exceed Grade A capabilities. Landscape construction, pergola and gazebo fabrication, dock building, and agricultural equipment repair represent typical end-use sectors. Contractors, lumber suppliers, hardware distributors, and construction procurement teams form the core buyer base. Ningbo S&D Metalwork Co., Ltd. notes flexible minimum order quantities and shipping options, though buyers must confirm actual MOQ, price band, available sizes, stock status, and whether mill test reports or third-party inspection certificates accompany each lot.

Ningbo S&D Metalwork Co., Ltd. operates from Yinzhou District, Ningbo, Zhejiang Province, postal code 315114, placing it within one of China's major manufacturing clusters for fasteners and metal components. The company holds an imported supplier tier and harbor trust tier on the platform. The response rate is listed at 0.00 percent with zero average response hours, indicating limited active platform engagement or pending data update. Buyers should anticipate initiating contact through direct channels and may need to follow up for quotations or technical documentation.

The supplier's stated product focus covers carbon steel fasteners with ASTM standard compliance, including the A307 Grade A hex lag bolt line. No verified information on factory floor space, annual production capacity, number of employees, years in operation, client list, or revenue is available in the profile. Ningbo's industrial infrastructure supports extensive heat treatment, surface finishing, and logistics services for fastener exporters. Prospective buyers should request a factory profile, quality management system certificates such as ISO 9001, and sample bolts for independent mechanical testing before committing to volume orders.