pulley rollers

Technical Description
Lineman roller pulleys, also known as stringing blocks, are heavy-duty cable guiding devices used during the installation and pulling of overhead conductors, fiber optic cables, and communication lines. These pulleys are designed to reduce friction and prevent conductor damage while maintaining proper cable alignment during stringing operations.
Manufactured with high-strength aluminum or steel frames, the pulleys feature a precision-machined sheave wheel that rotates smoothly under load. The grooved sheave is engineered to support various conductor sizes while protecting insulation and cable jackets.
The blocks are equipped with a locking hook or swivel eye that allows secure attachment to crossarms, poles, or rigging hardware. Many models also include sealed bearings to ensure smooth rotation and long service life even in demanding outdoor environments.
Typical Specifications
Frame material: Aluminum alloy / forged steel
Sheave diameter: 6 in – 12 in (varies by model)
Load capacity: 1,000 – 5,000 lbs
Bearing type: Sealed ball bearings
Mounting type: Hook latch / swivel eye
Application: Power line stringing, telecom cable installation, fiber optic deployment
Applications
Overhead power distribution line installation
Telecommunications cable pulling
Fiber optic line deployment
Utility pole and aerial line construction
Equipment used by professional utility crews is often supplied by manufacturers such as Klein Tools, Greenlee, and Hubbell Power Systems