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igus® inc.

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Radial Ball Bearings in Pellet Stoves


  • What was needed: bearing for the drive mechanism, which works continuously despite the adverse environment
  • Requirements: High temperature resistance, functionality despite small installation space
  • xirodur® material A500
  • Industry: Furniture Making / Industrial Design
  • Success for the customer: Plastic ball bearings guarantee smooth running in the long term and reduce downtime.

Learn more about the pellet stove: The pellet stove Gravity allows the electricity-free transport of wood pellets into the combustion chamber through a mechanical drive unit. In addition to its current-free function, it is adjustable in three stages, can be stopped immediately without completely burning the pellets. With an efficiency of 80%, it is the first stove in its class to work according to this innovative system.


Buy xiros radial ball bearing made of xirodur® A500
Mechanical drive unit of a pellet stove


Neither metallic nor various polymer plain bearings performed ideally in tests of "Erwin Koppe - Keramische Heizgeräte GmbH". Metallic ball bearings not only seized too fast, but were too loud in operation. Alternative tests with polymer plain bearings led to excessive coefficients of friction, so that these were also discarded. The problem was to find a component that keeps the complete mechanism running despite very small installation space and is also durable, temperature-resistant and insensitive to dirt.  


Two self-lubricating plastic ball bearings with the xirodur® A500 material are used in the mechanical drive unit. They ensure that the wood pellets are fed to the combustion chamber via a roller. The biggest advantage lies in the high temperature resistance of the ball bearing material. Short-term temperatures of up to 150°C (302°F) are easily possible and due to the absence of external lubricants nothing can get stuck inside the shaft. Thus, the plastic ball bearings always guarantee the required smooth running.

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xiros® radial ball bearings

xiros deep groove ball bearings

  • Up to 40% more cost-effective and 60% lighter than comparable metal bearings
  • Tested rigorously in our test laboratory to ensure long service life
  • Media-resistant, temperature-resistant, and self-lubricating

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Whether you're interested in turnkey, fully assembled solutions or looking to build your own customizable project, learn more about how igus® can assist you with a solution based on your specific application and requirements. Contact us via the form below or call us at (800) 521-2747 to discuss your project today!

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The terms "igus", "Apiro", "chainflex", "CFRIP", "conprotect", "CTD", "drylin", "dry-tech", "dryspin", "easy chain", "e-chain", "e-chain systems", "e-ketten", "e-kettensysteme", "e-skin", "e-spool", "flizz", "ibow", "igear", "iglidur", "igubal", "kineKIT", "manus", "motion plastics", "pikchain", "plastics for longer life", "readychain", "readycable", "ReBeL", "speedigus", "triflex", "robolink", "xirodur", and "xiros" are legally protected trademarks of the igus® GmbH/ Cologne in the Federal Republic of Germany and where applicable in some foreign countries.

igus® GmbH points out that it does not sell any products of the companies Allen Bradley, B&R, Baumüller, Beckhoff, Lahr, Control Techniques, Danaher Motion, ELAU, FAGOR, FANUC, Festo, Heidenhain, Jetter, Lenze, LinMot, LTi DRiVES, Mitsibushi, NUM,Parker, Bosch Rexroth, SEW, Siemens, Stöber and all other drive manufacturers mention in this website. The products offered by igus® are those of igus® GmbH