Import Din603 Carriage Bolt — Buy in Bulk from Supplier in China

The DIN603 carriage bolt from Handan Daoning Fasteners Co., Ltd. features a round head with a square neck under the head to prevent rotation during installation. Sizes range from 1/4 inch to 1 inch in imperial and M5 to M20 in metric, with thread types including M, UNC, and UNF. Materials include carbon steel, alloy steel, stainless steel, and brass, with mechanical grades such as Class 4.8, 5.8, 6.8, and 8.8. Surface finishes are available as plain, zinc plated in clear, blue, yellow, or black, black oxide, nickel, chrome, and hot-dip galvanized. These bolts conform to DIN603, ANSI/ASME B18.5, GBT12, and GBT14 standards.

Carbon steel variants are typically heat-treated to achieve the specified class strength, while stainless steel options use 304 or 316 grades for corrosion resistance. The square neck is precision forged to ensure a tight fit in pre-drilled square holes, a standard feature in structural steel and mechanical assemblies. Zinc plating thickness typically ranges from 5 to 15 microns depending on finish, and black oxide provides mild corrosion resistance without altering dimensional tolerances. All products undergo tensile and hardness testing, with salt spray exposure used to validate coating durability.

These bolts are commonly used in structural steel framing, wind turbine towers, oil and gas pipelines, and automotive chassis assemblies. Buyers include manufacturers of heavy machinery, renewable energy infrastructure, and industrial equipment. Trade terms offered include FOB, CIF, CFR, CNF, EXW, DDU, and DDP. Packaging is bulk in 25kg cartons on wooden pallets, with custom packaging available. The minimum order quantity is 500kg per specification, and monthly production capacity is 1000 metric tons. Test reports and material certifications are provided upon request.

Handan Daoning Fasteners Co., Ltd. operates from Congtai District, Handan, Hebei Province, China, with a registered address in Jishan Apartment. The company is verified as a harbor-tier supplier, indicating active participation in export trade channels. There is no public data on years in business, employee count, or annual revenue. The listing confirms capacity to supply 1000 tons monthly and provides material test reports upon request, suggesting internal quality control processes.

The supplier does not claim certifications such as ISO 9001, nor does it list any named clients or export volumes. Response rate and average response time are recorded as zero, indicating no recent buyer interactions on the platform. The company’s capability is demonstrated through product range, production volume, and documented compliance with international standards, but no claims about factory size, automation level, or R&D activity are present or implied.