Single Sheave Stringing Block Conductor Stringing Block for LGJ25-500 Conductor with 5-20KN Rated Load and Aluminum Sheave

Single Sheave Stringing Block Matched to LGJ25-500 Conductors

A single sheave block is the workhorse of overhead line work, and the most common installation error is choosing one whose groove does not match the conductor. This series is laid out by conductor range, from LGJ25-70 up to LGJ400-500, so the sheave diameter and groove are already matched to the line being pulled.

Product Overview

Twenty two standard configurations cover aluminium and nylon sheaves from 120x30mm to 400x120mm, with rated loads from 5KN to 20KN. Larger sheaves increase the bend radius and reduce bending stress in the conductor, which is why the 400mm versions are specified for LGJ400 and LGJ500 pulls.

Design Features and Field Benefits

• Conductor Matched Selection: Each model is labelled with its LGJ conductor range, so the sheave groove and diameter follow directly from the line design and there is no guesswork on site.
• Larger Sheaves for Larger Conductors: The series steps up to 400mm sheaves for LGJ400-500, keeping bend radius high enough to limit bending stress in heavy conductors.
• Aluminium or Nylon Sheave: Aluminium gives long wear life on abrasive ACSR; nylon is lighter, smoother and suited to aluminium and OPGW where surface marking must be avoided.
• Sealed Bearings for Low Pulling Effort: Sealed bearings keep the sheave free running and reduce the tension needed at the winch, which lowers rope wear and fuel use.

Single sheave configurations

Dimensions and ratings are nominal. Confirm the exact model against the datasheet before ordering.

Selection Guidance

• Start from the conductor type and diameter, then confirm the rated load against the pulling tension.
• Use 400mm sheaves for LGJ400 and LGJ500; smaller sheaves on large conductors increase bending stress.
• Order one size up where the same block will be used across several conductor sizes.

Typical Applications

• Overhead conductor installation and replacement
• Distribution and transmission line maintenance
• OPGW and earth wire pulls
• Emergency conductor repairs

Frequently Asked Questions

Quality Control and Delivery

Units are assembled in an ISO 9001 certified workshop. Frames are checked for sheave alignment and axle straightness, load bearing parts are inspected before assembly, and finished units are function checked before packing. Export packing is a plywood case with a moisture barrier, and a 12 month warranty covers manufacturing defects. Inspection records and, on request, third party load test certificates can be supplied with the shipment.

For project specific configurations, drawings or inspection requirements, send the conductor size, rated load and destination port with your enquiry.