Overhead Line Poleline Bolts Clamps Fittings Insulator Metal Fittings. Galvanized Surface Treatment: QT450-10 material with galvanized surface for corrosion resistance. High Mechanical Strength: Tensile strength >=450Mpa and yield strength >=310Mpa for durability. 18+ Years Experience: Over 18 years of manufacturing and exporting experience in fittings. Fast Delivery: Prompt delivery within 25 days after order confirmation. OEM/ODM Capability: 10+ years OEM/ODM experience with 150+ cooperating factories. ISO 9001 Certified: All factories certified to international ISO-9001 quality standards. Global Certifications: Approved by FM, NSF, TUV, DVGW, BSI, and other international bodies. Wide Application Range: Suitable for substation, line fittings, and various insulator types.