22-45mm Diameter POM Solid Plastic Balls Bearings Roller Bearing Transmission

Measure the inner bore of your housing or the groove width of your track, then select the matching diameter from the variant options. For imperial housings, note that 22.225mm = 7/8 in, 25.4mm = 1 in, 30.16mm ≈ 1-3/16 in, 38.1mm = 1-1/2 in, and 44.45mm = 1-3/4 in. If your housing has a slight interference fit, choose the next size down and verify clearance before ordering in bulk.

POM (acetal) sits between nylon and steel in terms of compressive strength. It has a compressive strength of approximately 110–140 MPa and a Rockwell hardness of around M80, making it suitable for moderate-load rolling applications. It outperforms nylon in dimensional stability and moisture resistance, but is not a substitute for steel in high-load or high-speed precision bearing applications.

Yes. POM has excellent resistance to water absorption (typically <0.2% by weight) and does not rust or corrode. These balls perform reliably in humid workshops, outdoor jigs, and wash-down environments. They are not recommended for prolonged immersion in strong oxidizing acids or concentrated alkalis — contact us to confirm suitability for specific chemical exposures.

Natural POM is widely used in food-processing machinery components due to its low moisture absorption and self-lubricating surface. However, food-grade certification requirements vary by jurisdiction and application. If your project requires FDA or EU food-contact compliance, please contact us to confirm the specific grade before ordering.

For prototyping or single-unit repairs, a 1–5 piece pack is the most cost-effective starting point. If you are building a conveyor run, a set of drawer slides, or a production jig, ordering 10–50 pieces typically reduces the per-ball cost significantly. Check the per-unit price across pack sizes in the variant selector before adding to cart.

Many standard ball-transfer units and caster sockets are designed around specific ball diameters. The 25.4mm (1 in) and 38.1mm (1-1/2 in) sizes are the most commonly compatible with off-the-shelf ball-transfer housings. Always verify the housing's specified ball diameter against the variant you select. If you are unsure, contact us with your housing model number and we can advise.

No lubrication is required under normal operating conditions — POM is inherently self-lubricating due to its low coefficient of friction (typically 0.1–0.3 against steel). In high-cycle or elevated-temperature applications (above 80°C), a light application of PTFE-based dry lubricant can extend service life. Avoid petroleum-based greases that may swell certain plastics.