
Factory Price Heavy Duty Zinc Galvanized Electric Automatic Garage Door Torsion Spring. Rust & Corrosion Resistant: Zinc-galvanized surface treatment ensures superior resistance to rust and corrosion for a longer lifespan. ISO 9001 Certified: Meets international quality standards with ASTM A229 Style certification for reliability and performance. OEM & Customization Support: Supports OEM services and offers flexible customization options including samples, designs, and minor adjustments. Versatile Application: Suitable for residential, commercial, and industrial garage doors with diameters of 1.75' and 2'. Multiple Wire Sizes: Available in various wire sizes ranging from 0.207 to 0.272 to fit different spring requirements. After-Sales Service Provided: Comprehensive after-sales service and warranty support are provided for all products.