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Cast polyamide (PA6G) sheave wheel

A sheave wheel is used to guide movements of ropes and cables. Steel cables are highly stressed and important machine parts. The service life of these cables can be extended by using a cast polyamide sheaves. Cast polyamide has a low modulus of elasticity which leads to low surface pressure between the rope/cable and the roller. As a result, the cable will wear less and last longer. 

Properties of the material

We mainly use cast polyamide (a high grade polyamide) for large products, such as sheave wheels. This material is not extruded, but casted. This makes it harder, more wear resistant and size-fitted than PA6. A cast polyamide sheave has the following properties:

  • high strength under compression;
  • high wear resistance;
  • good resistance to lubricants;
  • high weather resistance and
  • tough, also at low temperatures.

Advantages of a cast polyamide (PA6G) sheave wheel

The use of a cast polyamide sheave has a number of advantages over the use of a steel sheave, such as:

  • low modulus of elasticity: this leads to low surface pressure between the rope/cable and the roller. This extends the service life of the cables.
  • low weight: polyamide sheaves are around seven times lighter than steel sheaves. This eases the handling and assembly of the sheaves.
  • good damping properties: thus vibrations and running noises are reduced.

Custom-made PA6G sheaves

Ridderflex produces high quality custom-made sheaves. Based on your drawing or model, we can produce in both small and large quantities. Are you curious about all the possibilities? Please call +31 180 46 34 71 or send us an e-mail.

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ISO including co-engineering

Ridderflex complies with international quality management requirements. We are now also certified for co-engineering – our strength – . Read more


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