Industrial Door Torsion Spring with High-Tensile Steel for Maximum Durability

Industrial Door Torsion Spring with High-Tensile Steel for Maximum Durability. Premium High-Tensile Material: Made of high carbon steel and 60Si2MnA alloy steel for high hardness and strong bearing capacity. Long Service Life: Professional heat treatment ensures over 18,000 to 30,000 open and close cycles. Anti-Rust Surface Treatment: Available with powder coating, galvanizing, oiling, or electrophoretic options for various environments. Full Customization Support: Customizable wire diameter, inner diameter, length, color, and loading weight to match specific needs. Strict Quality Inspection: 100% inspection of hardness, tension, and fatigue resistance before shipment with test reports. Stable Performance: Uniform force and smooth lifting prevent deformation and extend door service life. Fast Delivery: 7-15 working days for formal orders and 3-5 days for sample orders. SGS Certified Quality: All products come with SGS test reports, material certificates, and factory inspection reports.