
Premium Black Head Screw Bolts for Global Distribution Needs. Wide Grade Range: Available in grades 4.8 to 12.9 for diverse strength requirements. Custom Surface Treatment: Options include Black/Gray Phosphated, Zinc Plated, and Hot Dip Galvanized. Flexible Customization: Supports customization from samples, designs, and full customization. Fast Delivery: Standard delivery time is about 10 days, with peak/off-season within 15 workdays. OEM/ODM Support: Professional manufacturer offering integrated design, development, and production services. High Quality Control: Strict pre-production sampling and final inspection before shipment. Versatile Application: Suitable for machinery, building, and solar mounting systems. Global Standards: Complies with DIN, ANSI, GB, JIS, ISO, BS, and IS standards.