Insulator End Fittings: Ball, Socket, Tongue, and Clevis

Short Description:

This series of end fittings is specifically engineered for High-Voltage (HV) and Extra-High-Voltage (EHV) composite insulators. Serving as the critical interface between insulators, tower structures, and conductors, these components are designed to withstand extreme mechanical loads while ensuring superior electrical safety performance.Our products are fully compliant with international and national standards, including IEC 61466, IEC 60120, and GB/T 21421.


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Product Details

As a world-leading supplier of composite insulator components, we operate fully integrated production lines for end fittings. We provide a wide range of fittings compliant with international standards such as GB/T 21421.1-2021, IEC 61466-1:2016, and ANSI C29.12-2020. Beyond standard models, our robust R&D team offers custom design and mass production tailored to your specific engineering requirements.

Types of Suspension Insulator End Fittings Suspension Fittings, Insulator Components, End Fittings for Composite Insulators

Core Competencies

Our manufacturing facilities in Wenzhou and Lishui are equipped with advanced forging and precision machining workshops. We independently forge various fitting blanks, maintaining full-process management from raw material control to final finishing. This ensures exceptional mechanical strength and dimensional precision for every product.


Click the links below to explore our manufacturing capabilities through our 360° Digital VR Workshops.

Wenzhou Forging WorkshopLishui Machining Workshop

Wenzhou Plant

Lishui Plant


Manufacturing Process & Features

Insulator Fitting Production Flow: Forging and Casting Process Chart

  • High-Strength Materials: Manufactured using premium Forged Steel or Ductile Iron. The forging process ensures a dense internal structure free of pores or sand holes, capable of withstanding high tensile loads from 40kN to 550kN.

  • Superior Corrosion Resistance: All products undergo rigorous Hot-Dip Galvanizing. The zinc coating is uniform with a thickness exceeding standards (average thickness >86μm), providing excellent durability in salt spray, humid, and polluted industrial environments with a design life of over 30 years.

  • Precision-Engineered Dimensions: Interfaces including Ball, Socket, Clevis, and Tongue are designed strictly according to GB/T 21421.1, IEC 61466-1, and ANSI C29.12. Nominal sizes like 11, 16, 20, 24 are highly accurate, ensuring seamless interchangeability and flexible connection with various insulators.

  • Electrical Reliability: All structural edges are rounded and smoothed to effectively suppress local Corona discharge, ensuring electromagnetic compatibility for high-voltage line operations.


Key Applications

Widely used in AC and DC power transmission and distribution lines from 10kV to 1000kV. These are critical end-fitting components for composite suspension insulators, tension insulators, and post insulators.

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