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xiros® polymer ball bearings


I am familiar with products from igus and know the necessary inner and outer diameters, materials, requirements etc.

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Online tools

I know the environment variables of my application and would like to calculate the service life of my ball bearings.

Easy online configuration

More about xiros

I need more information on xiros polymer ball bearings with regard to materials, types and advantages.

Further information

Special parts

I need an individual, custom-made special part that deviates from the DIN standard for my special application. 

Submit an enquiry for special parts

The alternative to metal bearings

xiros polymer ball bearings to DIN 625 do not need any external lubrication, are corrosion-resistant (if glass or plastic balls are used) and, during operation, are extremely quiet. This makes them a cost-effective alternative to metal ball bearings. Made from a mixture of tribo-polymers, the iglidur material plastic components are light, resistant to chemicals and non-magnetic. This ensures that they can be used safely in the areas of medicine, packaging, food processing, drive technology and other industries.  Whereas the polymer for our xiros ball bearings consists of a mixture of basic plastics, solid lubricants, fibres and filaments, the balls are typically made ofglass, plastic or stainless steel. The balls are housed in a cage, which can consist of our own xirodur B180 material, polyamide (PA), polypropylene (PP) or polyetheretherketone (PEEK). Please see our catalogue to find further combinations of materials and technical specifications.

Overview of xiros® polymer ball bearings


What exactly is a ball bearing?

Ball bearings belong to the family of rolling bearings. Moving between an inner ring and an outer ring, rolling bodies reduce rotational friction and absorb radial and axial loads. In most applications, one ring is rigid and the other is attached to the rotating assembly such as a hub or a shaft made of steel. When a ring rotates, the balls, which are fixed in place inside a cage, also begin to rotate. Because the balls roll, they have a much smaller coefficient of friction than two flat surfaces that slide against each other. Due to the smaller contact surface between balls and rings, the ball bearings tend to have a lower load capacity for their size than other kinds of rolling bearings. However, they can tolerate a certain amount of misalignment of the inner and outer rings.  Plain bearings can absorb heavier loads and are less sensitive to shocks.

Advantages of our polymer ball bearings

  • Lubrication-free and maintenance-free
  • Corrosion resistance
  • Metal-free (due to the use of glass and plastic balls), therefore non-magnetic
  • For temperatures up to +150°C (depending on material)
  • High media resistance, suitable for washdown
  • Lightweight
  • Electrically insulating (or ESD-compliant)
  • FDA-compliant (depending on material)
  • Predictable service life

Around the world, customers already rely on xiros polymer ball bearings

CW Cleaning Solutions GmbH | Novetrium GmbHErwin Koppe - Keramische Heizgeräte GmbH | Airex Co. Ltd. | ISAS GmbH | Ishida Europe


"Smooth operation is crucial"

Sören Meissner, Design Engineer at Krones AG

"Decisive for us here is the smooth running of the ball bearings in the guide rollers. In the past, we used metal bearings here. However, this was not light enough, sometimes making the complete roll stop and the label band would slip over it."
Sören Meissner | Design Engineer for Labelling Technology at Krones AG

Further customer applications

xiros® polymer ball bearing applications at a glance

Whether packaging, textile industry, testing technology and quality assurance or model making: xiros polymer ball bearings are already successfully used in a wide variety of industries; they are especially popular wherever conventional metal ball bearing solutions are not suitable.
Go to the application overview

Measurement requirements and installation recommendations

igus is one of just a few manufacturers worldwide who produce ball bearing rings in injection moulding. This offers users the following advantages:

  • High wear resistance due to the shape under high pressure
  • Homogeneous material distribution
  • Cost-effective production, leading to cheap sales prices
  • Simplification of ball bearing installation
Due to this manufacturing process, different rules apply to the measurement as well as the installation compared to metal or ceramic ball bearings. The outer ring of the polymer ball bearings has a conical shape. This simplifies the installation in a suitable housing (with the narrow side first). After press-fit into a housing machined to a H7 tolerance the bearing clearance is reduced. Therefore, the ball bearings must be measured over the entire width; starting at an angle of 90° from the injection point.

Tolerances and installation recommendations for xiros® polymer ball bearings


Our ball bearings are put through their paces in the industry's largest test laboratory anywhere in the world.

xiros catalogue

You can download the current catalogue here.


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The terms "igus", "Apiro", "CFRIP", "chainflex", "conprotect", "CTD", "drygear", "drylin", "dryspin", "dry-tech", "easy chain", "e-chain", "e-chain systems", "e-loop", "e-ketten", "e-kettensysteme", "e-spool", "e-skin", "flizz", "ibow", "igear", "iglidur", "igubal", "kineKIT", "manus", "motion plastics", "pikchain", "plastics for longer life", "print2mold", "readycable", "readychain", "ReBeL", "robolink", "speedigus", "tribofilament", "triflex", "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, Mitsubishi, NUM, Parker, Bosh Rexroth, SEW, Siemens, Stöber and all other drive manufacturers mentioned on this website. The products offered by igus® are those of igus® GmbH.