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When metal bearings corrode, seize, or add unwanted weight to your build, engineers and makers turn to POM plastic deep groove ball bearings with glass balls. Whether you are designing a food-processing conveyor, a marine-grade mechanism, or a lightweight RC model, standard steel bearings introduce rust risk and electromagnetic interference that these non-metallic bearings eliminate entirely.
Each bearing features a POM (polyoxymethylene / Delrin) outer and inner ring paired with precision glass rolling elements. The full non-metallic construction delivers inherent corrosion resistance without coatings that can wear off. Available sizes span from 603 (3×9×3 mm / 0.12"×0.35"×0.12") up to 6812 (60×78×10 mm / 2.36"×3.07"×0.39"), covering the 60x, 62x, 63x, 68x, 69x, 6800, 6900, and 6200 series in a single listing. Each variant is sold in quantities of 1, 5, or 10 pieces.
Typical use cases include waterproof fishing reel rebuilds requiring non-corroding replacements, 3D printer carriage and idler positions where low rolling resistance matters, chemical-handling equipment where metal contamination is prohibited, and lightweight drone or RC car builds where every gram counts.
| Bearing Type | Deep Groove Ball Bearing (open, non-metallic) |
|---|---|
| Ring Material | POM (Polyoxymethylene / Delrin) |
| Rolling Element Material | Glass balls |
| Cage Material | POM or integrated ring design (varies by size) |
| Bore (Inner Diameter) | 3 mm – 60 mm (0.12" – 2.36") — See variant options |
| Outer Diameter | 7 mm – 95 mm (0.28" – 3.74") — See variant options |
| Width | 2 mm – 20 mm (0.08" – 0.79") — See variant options |
| Size Series Covered | 60x, 62x, 63x, 68x, 69x, 6800, 6900, 6200 (603–6812) |
| Waterproof Rating | Inherently waterproof (non-metallic construction) |
| Corrosion Resistance | Resistant to water, salt spray, and mild chemicals |
| Electrical Conductivity | Non-conductive |
| Operating Temperature | Typically –40°C to +100°C (–40°F to +212°F) |
| Max Recommended Speed | See variant options / Contact us to confirm |
| Load Rating | See variant options / Contact us to confirm |
| Available Quantities | 1 pc, 5 pcs, 10 pcs |
| Lubrication | Dry / unlubricated (grease-compatible if required) |
Match the bearing number to your shaft's outer diameter (bore), your housing's inner diameter (outer diameter of the bearing), and the available axial space (width). For example, a 608 bearing has an 8 mm bore, 22 mm outer diameter, and 7 mm width. Cross-reference these three dimensions with your design drawings or measure the existing bearing with calipers before ordering.
POM bearings have lower load ratings than equivalent steel bearings. They are designed for light-to-moderate radial loads in applications where corrosion resistance, electrical insulation, or weight reduction outweigh the need for maximum load capacity. For heavy-duty industrial loads, steel bearings remain the standard choice. If you are unsure whether POM suits your load requirements, contact us with your application details.
Yes. The POM ring and glass ball construction contains no ferrous metal, so there is no rust pathway. These bearings are well-suited for fishing reels, marine hardware, kayak rudder pivots, and other saltwater-exposed mechanisms. Rinse with fresh water after prolonged saltwater immersion to remove salt deposits from the raceway.
POM has inherent self-lubricating properties, so these bearings can run dry in many low-speed, light-load applications. For higher speeds or extended service life, a small amount of PTFE-based or silicone grease is compatible. Avoid petroleum-based greases, which can degrade POM over time. Do not use oil-bath lubrication.
Yes. The outer and bore dimensions follow standard metric deep groove ball bearing tolerances, so they are drop-in replacements for steel bearings of the same designation (e.g., 608, 6001, 6205). Verify the exact dimensions listed in the variant name (bore × OD × width in mm) against your housing before installation.
POM (Delrin) has a continuous service temperature of approximately –40°C to +100°C (–40°F to +212°F). Intermittent peaks up to around 120°C may be tolerated briefly, but sustained high temperatures will cause dimensional creep and reduced load capacity. For applications above 100°C, consider ceramic or stainless steel alternatives.
POM is widely used in food-contact applications due to its chemical inertness and ease of cleaning. Glass balls are also inert. However, regulatory compliance (FDA, EU 10/2011, etc.) depends on the specific grade of POM used. If your application requires certified food-grade or medical-grade documentation, please contact us before ordering to confirm material certification availability.
