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When metal bearings corrode, seize, or add unwanted weight to your build, you need a smarter solution. POM plastic deep groove ball bearings are the go-to choice for makers, hobbyists, and engineers who work in wet environments, food-adjacent applications, or anywhere electrical isolation is critical. These bearings eliminate the rust and conductivity concerns that come with steel alternatives.
Each bearing features a POM (polyoxymethylene / acetal) outer race and cage paired with precision glass balls, delivering smooth, low-noise rotation. Available in standard metric models from 608 through 6006, with inner diameters ranging from 6 mm (0.24 in) to 30 mm (1.18 in) and outer diameters from 19 mm (0.75 in) to 55 mm (2.17 in). Heights span 6 mm to 13 mm depending on model.
Ideal for 3D printer carriage wheels and idler pulleys, RC car and drone frame pivots requiring non-conductive bearings, food processing equipment where metal contamination must be avoided, and marine or outdoor DIY projects exposed to moisture and chemicals.
Polyoxymethylene construction resists moisture, mild acids, and alkalis — no rust, no corrosion, no seized bearings after exposure to water or humidity.
Smooth-surfaced glass rolling elements provide consistent, low-friction rotation and are electrically non-conductive — essential for electronics and robotics builds.
608 through 6006 sizing covers the most common DIY and light-industrial bore diameters from 6 mm to 30 mm, making sourcing and replacement straightforward.
The POM cage dampens vibration and reduces operating noise compared to unshielded steel bearings — a noticeable improvement in printers, fans, and spinners.
POM plastic is significantly lighter than steel, reducing rotating mass in weight-sensitive applications like drone frames, RC vehicles, and portable equipment.
Order 1, 5, 10, 20, or 50 pieces per model — stock up for a project run or grab a single replacement bearing without overpaying for a bulk pack you don't need.
| Material — Race & Cage | POM (Polyoxymethylene / Acetal) |
|---|---|
| Rolling Elements | Glass balls |
| Bearing Type | Deep groove, open (unshielded) |
| Available Models | 608, 626, 6000, 6001, 6002, 6003, 6004, 6005, 6006 |
| Inner Diameter (ID) Range | 6 mm – 30 mm (0.24 in – 1.18 in) |
| Outer Diameter (OD) Range | 19 mm – 55 mm (0.75 in – 2.17 in) |
| Height Range | 6 mm – 13 mm (0.24 in – 0.51 in) |
| Operating Temperature | Typically –40 °C to +100 °C (–40 °F to +212 °F) |
| Lubrication | See variant options |
| Load Rating | See variant options |
| Pack Quantities Available | 1 / 5 / 10 / 20 / 50 pcs |
| Dimensional Standard | ISO metric (608–6006 series) |
Match the model number to your shaft diameter: 608 fits an 8 mm shaft, 626 fits 6 mm, 6000 fits 10 mm, 6001 fits 12 mm, 6002 fits 15 mm, 6003 fits 17 mm, 6004 fits 20 mm, 6005 fits 25 mm, and 6006 fits 30 mm. Also verify the outer diameter fits your housing bore and that the height clears your frame or bracket.
POM plastic bearings are designed for light to moderate radial loads — they are well-suited for 3D printers, RC vehicles, drones, and similar applications. They are not intended for heavy industrial loads or high-speed applications that require steel or ceramic bearings. If your application involves significant impact or sustained heavy radial loads, contact us to confirm suitability.
Yes. The POM race and cage resist moisture, mild acids, alkalis, and many common solvents. The glass balls do not rust. This makes them a reliable choice for outdoor, marine, food-processing, and humid-environment applications where steel bearings would corrode and seize over time.
Yes — both POM and glass are electrical insulators. These bearings are a popular choice in robotics, electronics enclosures, and any build where you need to prevent current from passing through the bearing assembly. They will not create a conductive path between shaft and housing.
Yes — these bearings follow standard ISO metric dimensions for the 608 and 6000 series, so they are dimensionally interchangeable with steel bearings of the same model number. Simply confirm the model number matches your existing bearing and they will fit the same shaft and housing.
POM and glass have naturally low friction coefficients and can run dry in many light-duty 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.
For a single repair or prototype, the 1-piece option lets you test fit and function before committing. For a production run, printer build, or stocking spare parts, the 10, 20, or 50-piece packs offer a lower per-unit cost. The 5-piece pack is a practical middle ground for small batch projects.
