Overhead line stringing blocks (also known as conductor stringing pulleys or aerial stringing blocks) are essential specialized tools widely used in the erection, tension stringing, and maintenance of overhead power transmission and distribution lines. Designed to guide and support conductors, optical cables, and pulling ropes during construction, these products effectively reduce frictional resistance and prevent conductor abrasion, bending deformation, and derailment.

They are suitable for overhead line projects ranging from 10kV to 500kV and accommodate various conductor types, including conventional Aluminum Conductor Steel-Reinforced (ACSR), aluminum alloy conductors, and overhead optical cables.

Featuring a modular and lightweight design, these blocks offer flexible configurations—such as single-wheel, three-wheel, and multi-wheel setups—to suit diverse construction methods, including single-conductor stringing, bundled conductor stringing, and helicopter-assisted aerial stringing. They serve as standard equipment for power grid construction and overhead line renovation projects.

• Low Friction and Conductor Protection: Made of high-strength MC nylon or rubber-lined aluminum alloy with smooth, refined groove surfaces to prevent scratching or damage to conductors
• High Load-Bearing Capacity and Durability: Constructed from galvanized steel or aerospace-grade aluminum alloy with sealed, high-precision bearings for smooth rotation under heavy loads
• Anti-Derailment Safety Structure: Built-in anti-derailment guards and locking mechanisms prevent conductors from slipping out during operations
• High Adaptability: Available in various wheel diameters, groove widths, and load-bearing specifications with universal swivel hooks for rapid installation
• Lightweight and Easy to Operate: Optimized lightweight structure reduces physical strain and supports both ground-based and aerial operations

• Construction, tension stringing, and conductor recovery for overhead high-voltage transmission lines
• Replacement, maintenance, and tension adjustment of overhead distribution lines
• Aerial stringing of OPGW (Optical Ground Wire)
• Helicopter-assisted long-distance overhead line installation
• Synchronous stringing of bundled conductors in high-voltage grid projects

Common standard specifications for overhead line stringing pulleys, covering light, medium, and heavy-duty models:

During overhead line stringing operations, these pulleys are secured to tower cross-arms or suspension points. Conductors or pulling ropes are placed within the pulley grooves, and tension is applied using pulling equipment. The low-resistance rotation of high-precision bearing pulleys converts sliding friction into rolling friction, significantly reducing pulling resistance while preventing conductor damage and ensuring compliance with power construction standards.