High Standard Carbon Steel Grade 8.8 Grade 10.9 Zinc Plated Galvanized Round Mushroom Square Neck Head DIN603 Carriage Bolts

High Standard Carbon Steel Grade 8.8 Grade 10.9 Zinc Plated Galvanized Round Mushroom Square Neck Head DIN603 Carriage Bolts. OEM/ODM Customization: Flexible customization available for non-standard products based on drawings or samples. Wide Size Range: Available in sizes M4-M16 and imperial equivalents like 1/4-20 to 1/2-13. Multiple Grades: Offered in high-strength grades 8.8, 10.9, and 12.9 for diverse application needs. Various Finishes: Options include Zinc Plated, Hot DIP Galvanized, Black Oxide, and Dacromet. Strict Quality Control: Comprehensive testing including chemical analysis, tensile strength, and salt spray tests. Fast Delivery: Ship within 3 days for stock items; 7-15 days for OEM samples; 20-30 days for bulk. Free Samples: Free product samples available, with shipping costs covered by the buyer. 15+ Years Experience: Over 15 years of specialized OEM service experience in fastener manufacturing.