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When standard steel bearings corrode, seize, or add unwanted weight to your build, you need a smarter solution. POM plastic deep groove ball bearings with glass balls are engineered for makers, hobbyists, and engineers who work in wet, chemical-exposed, or weight-sensitive environments where metal bearings simply fall short.
Each bearing features a POM (polyoxymethylene) plastic outer race and cage combined with precision glass balls, delivering a fully non-metallic rolling element assembly. Available in inner diameter (I.D) sizes ranging from 3 mm (approx. 0.12 in) to 80 mm (approx. 3.15 in), with outer diameters (O.D) and thickness dimensions varying by size — select your exact I.D*O.D*Thickness combination from the variant options above.
These POM glass ball bearings are ideal for 3D printer carriage wheels and linear motion systems, food-processing or wet-environment machinery requiring non-metallic deep groove ball bearings, RC car and drone builds where lightweight corrosion-resistant bearings reduce rotating mass, and DIY furniture sliders or drawer mechanisms needing quiet, smooth-rolling plastic bearings.
The outer race and cage are machined from POM (Delrin-type) engineering plastic — lightweight, self-lubricating, and resistant to many chemicals and moisture.
Glass balls replace steel balls entirely, eliminating metallic corrosion at the rolling contact and making these bearings suitable for non-magnetic and non-conductive applications.
Neither POM nor glass corrodes in water or mild chemical environments, making these deep groove ball bearings a reliable choice for outdoor, marine, or wash-down applications.
With inner diameters from 3 mm (≈ 0.12 in) to 80 mm (≈ 3.15 in) and matching O.D and thickness dimensions, there is a size for most small-to-medium bearing applications.
POM plastic has a density roughly one-seventh that of steel, reducing rotating mass in weight-critical builds such as drones, RC vehicles, and precision instruments.
Order as a single bearing (qty 1) to test fit, or choose the 4-pack for project builds and spares — both options available for every size variant.
| Bearing Type | Deep Groove Ball Bearing |
|---|---|
| Outer Race / Cage Material | POM (Polyoxymethylene) Plastic |
| Rolling Element Material | Glass Balls |
| Inner Diameter (I.D) | 3 mm – 80 mm (see variant options) |
| Outer Diameter (O.D) | See variant options |
| Thickness | See variant options |
| Waterproof | Yes |
| Magnetic | No (fully non-metallic) |
| Lubrication | Self-lubricating (POM material property) |
| Pack Quantity | 1 pc or 4 pcs (see variant options) |
| Product Type | Ball Bearings |
Measure your shaft's outer diameter — this becomes your bearing's inner diameter (I.D). Then confirm the outer diameter (O.D) fits your housing and that the thickness matches your available axial space. Select the matching I.D*O.D*Thickness variant from the dropdown above.
Yes. Both POM plastic and glass are non-porous and do not rust or corrode in water. These bearings are well-suited for wet environments, outdoor use, and applications exposed to splashing or humidity. For full submersion in aggressive chemicals, verify chemical compatibility of POM with your specific fluid.
POM plastic bearings have lower load capacity than steel bearings of the same size. They are designed for light-to-moderate radial loads in applications where corrosion resistance, non-magnetic properties, or weight reduction are priorities. They are not recommended for heavy industrial loads or high-speed, high-temperature environments.
Yes — the outer diameter (O.D) dimensions follow standard bearing sizing conventions, so these POM bearings can replace same-size steel bearings in most housings. Always verify the O.D and thickness of the specific variant you select against your housing specifications.
Absolutely. These are a popular choice for 3D printer carriage wheels, linear rail systems, and RC car or drone builds where reducing rotating mass and avoiding corrosion are important. Select the size that matches your printer or vehicle's shaft and housing dimensions.
POM is inherently self-lubricating, so these bearings can run dry in many applications. For extended service life under continuous load, a light application of PTFE-based or silicone grease compatible with plastics is recommended. Avoid petroleum-based greases that may degrade POM over time.
Glass balls are non-metallic, non-magnetic, and non-conductive. Combined with the POM plastic race, they create a fully corrosion-proof, electrically non-conductive bearing — ideal for food-grade machinery, medical devices, electronic environments, and any application where metal contamination or magnetic interference must be avoided.
