Import Astm A325m 8s Heavy Hex Structural Bolts — Buy in Bulk from Supplier in China

The ASTM A325M 8S heavy hex structural bolts from Ningbo S&D Metal Work Co.,Ltd are carbon steel fasteners engineered for heavy-duty structural connections in steel frameworks. They meet the ASTM A325M standard for high-strength bolts, with a heavy hex head design that provides superior torque transfer and load distribution. Surface treatments include plain, black, zinc-plated, yellow zinc-plated and hot-dipped galvanized finishes to suit different corrosion resistance requirements.

These bolts are manufactured from medium carbon steel, with the 8S designation indicating an 8.8-grade equivalent in metric spec, offering a typical tensile strength of 800 MPa and yield strength of 640 MPa. The heavy hex geometry is standard for structural applications, with typical head dimensions conforming to ASME B18.2.6 for compatibility with standard wrenches and sockets. Threads are rolled for enhanced fatigue resistance, a critical feature in dynamic load environments.

Primary applications include steel construction for commercial buildings, bridges and industrial machinery, where they are used to join beams, girders and columns. Buyers typically source these in bulk for large-scale projects, with packaging options including standard 25 kg cartons or palletized shipments. The bolts are supplied with matching heavy hex nuts and washers, and are compatible with standard structural steel grades such as S275 and S355.

Ningbo S&D Metal Work Co.,Ltd operates from No.691-1, Tiantong, Dongwu in Ningbo, Zhejiang Province, China. The company specialises in the production and export of fasteners, including structural bolts, with a focus on meeting international standards such as ASTM and ISO. Its imported tier classification indicates it sources raw materials or components from overseas to maintain quality and consistency in its output.

The supplier’s profile shows a harbor trust tier, reflecting a baseline level of verification for export capability. While the response rate is currently recorded at 0.00, the company’s address and tier information confirm its operational presence in a key industrial region for metalwork. Ningbo’s proximity to major ports facilitates efficient shipping for international buyers, particularly for bulk orders of structural fasteners.