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Engineers, hobbyists, and makers who work in wet, chemical, or electrically sensitive environments know the frustration of metal bearings that corrode, conduct, or add unnecessary weight to a build. These POM plastic deep groove ball bearings with glass balls are designed for exactly those demanding conditions — offering a reliable, non-metallic rolling solution for light-load rotary applications.
Each bearing is machined from POM (polyoxymethylene / acetal) resin with glass ball rolling elements. The inner diameter ranges from 3 mm (0.12 in) to 45 mm (1.77 in), the outer diameter from 8 mm (0.31 in) to 85 mm (3.35 in), and the width from 3 mm (0.12 in) to 21 mm (0.83 in) — covering a wide spectrum of miniature and small-frame bearing needs. Multiple series are available including POM69x, POM60x, POM62x, POM68x, POM63x, and POM619x configurations.
Typical use cases include 3D printer carriage assemblies requiring non-conductive bearings, food-processing or laboratory equipment where metal contamination is a concern, RC model builds and drone frames where weight savings matter, and light-duty conveyor or guide-rail systems in corrosive environments.
The full POM (acetal resin) construction resists moisture, mild acids, and alkalis — making these bearings suitable for damp or chemically active environments where steel bearings would degrade.
Glass balls provide smooth, low-friction rolling with excellent chemical resistance and electrical insulation — ideal for applications where metal contamination or conductivity is unacceptable.
Both the POM races and glass balls are non-conductive, making these bearings safe for use near sensitive electronics, PCB assemblies, and motor windings without risk of short circuits.
POM has a density of approximately 1.41 g/cm³ — significantly lighter than steel — reducing rotating mass in weight-sensitive builds such as drones, RC models, and precision instruments.
Available in dozens of models across multiple series (POM69x, POM60x, POM62x, POM68x, POM63x, POM619x), covering inner diameters from 3 mm to 45 mm to fit a broad range of shafts and housings.
Order as a single piece for prototyping, a pack of 5 for small-batch builds, or a pack of 10 for production runs — all available from the same listing for convenient restocking.
| Material — Races | POM (Polyoxymethylene / Acetal Resin) |
|---|---|
| Material — Rolling Elements | Glass Balls |
| Inner Diameter (d) | 3 mm – 45 mm (0.12 in – 1.77 in) |
| Outer Diameter (D) | 8 mm – 85 mm (0.31 in – 3.35 in) |
| Width (B) | 3 mm – 21 mm (0.12 in – 0.83 in) |
| Bearing Type | Deep Groove Ball Bearing (Miniature) |
| Available Series | POM693 / POM60x / POM62x / POM68x / POM63x / POM619x |
| Operating Temperature | -40 °C to +80 °C (-40 °F to +176 °F) |
| Lubrication | See variant options |
| Sealing / Shielding | See variant options |
| Max Radial Load | See variant options |
| Quantity per Pack | 1 pc / 5 pcs / 10 pcs (select above) |
| Color | Natural White / Off-White (POM) |
Match the inner diameter (d) to your shaft diameter and the outer diameter (D) to your housing bore. The model name encodes all three dimensions — for example, POM693 (3*8*3mm) means d=3 mm, D=8 mm, B=3 mm. Measure your shaft and housing with calipers before selecting a variant to ensure a proper fit.
POM plastic bearings are designed for light-to-moderate radial loads at low-to-medium speeds. They are well-suited for 3D printers, RC models, laboratory instruments, and light conveyor systems. They are not recommended for heavy industrial loads, high-speed spindles, or applications with significant axial thrust. If your load requirements are demanding, consult the specific load rating for your chosen model.
No. Both the POM races and the glass rolling elements are inherently corrosion-resistant. They will not rust when exposed to water, moisture, or mild chemical environments. This makes them a reliable choice for food-processing equipment, aquatic applications, and outdoor builds where metal bearings would corrode over time.
Yes, provided the outer diameter (D) and width (B) of the selected model match your housing dimensions. POM bearings follow the same dimensional conventions as standard miniature deep groove ball bearings, so they can often be used as a drop-in replacement in existing housings. Always verify the exact dimensions from the model code before ordering.
POM and glass are both water-resistant materials, making these bearings suitable for damp and splash-prone environments. For fully submerged continuous operation, verify that any lubrication used is also water-compatible. The bearing body itself will not absorb water or swell under normal conditions.
Each series designation corresponds to a different dimensional standard for the relationship between inner diameter, outer diameter, and width. The POM69x series is the narrowest (thin-section), while POM63x and POM60x series are wider for a given bore size. Choose the series whose outer diameter and width fit your housing. The model code (e.g., 3*8*3mm) always shows the exact d×D×B dimensions for confirmation.
POM and glass have naturally low friction coefficients and can run dry in many light-load applications. For extended service life or higher-speed use, a light application of PTFE-based or silicone grease is recommended. Avoid petroleum-based greases, which can degrade POM over time.
