
Heavy-Duty Carbon Steel Carriage Bolt and Nut Kit for Construction. Customized Standards: Supports DIN, ANSI, GB, JIS, BSW, GOST, and fully customized standards per drawing. Customized Thread: Offers Metric Coarse, Metric Fine, UNC, UNF, BSW, BSF, and other custom thread options. Wide Grade Range: Available in grades 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, and 12.9 to meet diverse strength needs. Diverse Surface Coatings: Includes Dacromet, Colored Zinc, Zinc Plated, Hot DIP Galvanizing, and custom plating options. High Production Capacity: Annual output reaches 400 million fasteners with a reject ratio of only 300ppm. Comprehensive Certifications: Certified under ISO9001, ROHS, REACH, and IATF16949 for global quality compliance. OEM and ODM Services: Accepts custom logos, designs, and full customization based on customer samples or drawings. Sample Availability: Free samples provided for standard fasteners; customized parts available within 15 days.