Pulley & Sheave Radius Guides

Coast guard Helicopter
Aircraft 2
Crane Maribne strandcore
Aircraft 3

Get the most out of your Wire Rope

The service life of cable and wire rope can be increased if (1) it operates over the largest possible pulley or sheave diameter, and (2) it is properly supported in the pulley or sheave groove. The working life of the individual wire strands is greatly reduced as the pulley or sheave diameter is diminished. The chart below shows minimum tread diameters over which various sizes and constructions of cable should operate. 

Pulley & Sheave Radius Guide

The recommendations below are based on the standard D:d ratio where:

D = diameter of the pulley at it's grove

d = diameter of the aircraft cable or wire rope

 

Minimum Tread Diameter for Pulleys or Sheaves

RATIO OF PULLEY DIAMETER TO CABLE DIAMETER (D:d)
  Desired Minimum  Critical Minimum
42:124:112:128:118:110:1
ConstructionConstruction
Cable Diameter6x7 or 7x76x19 or 7x196x31 or 6x376x7 or 7x76x19 or 7x196x31 or 6x37
1/162-5/8--------1-3/4--------
3/322-15/162-1/4----2-5/81-11/16----
1/85-1/43----3-1/22-1/4----
5/326-9/163-3/4----4-3/82-7/8----
3/167-7/84-1/2----5-1/43-3/8----
7/329-13/165-1/4----6-1/84----
1/410-1/26374-1/22-1/2
5/1613-1/87-1/23-3/48-3/45-5/83-1/8
3/815-3/494-1/210-1/26-3/43-3/4
7/1618-3/810-1/25-1/412-1/47-7/84-3/8
1/2211261495
9/1623-5/813-1/26-3/415-3/410-1/85-5/8
5/826-1/4157-1/217-1/211-1/46-1/4

 

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