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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 as a reliable alternative. Whether you're designing RC vehicles, 3D printer carriages, food-contact equipment, or wet-environment mechanisms, these bearings deliver smooth rotation without the rust risk that plagues steel options.
Each POM plastic deep groove ball bearing in this listing features a full-plastic construction — both races and cage — with inner diameters ranging from 3 mm (≈0.118 in) to 7 mm (≈0.276 in) and outer diameters from 9 mm (≈0.354 in) to 24 mm (≈0.945 in). Thickness spans 3 mm to 7 mm depending on the selected size. Available sizes include 603, 604, 605, 606, 607, 608, 609, 634, 635, and 636.
Typical applications include 3D printer idler pulleys, RC car wheel hubs, light-duty conveyor rollers, aquatic or humid-environment assemblies, and DIY robotics joints where non-conductive or non-magnetic properties are required. These POM deep groove ball bearings for 3D printers and RC builds are a go-to choice when weight savings and corrosion resistance matter most.
Both inner and outer races are machined from polyoxymethylene (POM/Delrin), delivering inherent corrosion resistance without any surface coating that can flake or wear away.
POM density is roughly one-seventh that of steel, making these bearings ideal for weight-sensitive applications such as drone frames, RC vehicles, and portable robotics.
The plastic races dampen vibration and reduce operational noise compared to unshielded steel bearings, benefiting precision instruments and quiet-running mechanisms.
Electrically insulating and non-magnetic properties make these bearings suitable for electronics assemblies, MRI-adjacent equipment, and applications where stray currents or magnetic interference must be avoided.
Covers sizes 603 through 636 with ID ranging 3–7 mm and OD ranging 9–24 mm, fitting a wide range of metric shafts and housings without custom machining.
The deep groove profile handles both radial and moderate axial loads, providing versatility across rotating shaft applications without requiring separate thrust bearings for light axial forces.
| Bearing Type | Deep Groove Ball Bearing |
|---|---|
| Material | POM (Polyoxymethylene / Delrin) |
| Available Sizes | 603, 604, 605, 606, 607, 608, 609, 634, 635, 636 |
| Inner Diameter (ID) | 3 mm – 7 mm (≈0.118 in – 0.276 in) |
| Outer Diameter (OD) | 9 mm – 24 mm (≈0.354 in – 0.945 in) |
| Thickness | 3 mm – 7 mm (varies by size) |
| Variant Dimension Format | ID × OD × Thickness (mm) |
| Load Type | Radial + light axial |
| Shielding | Open (unshielded) |
| Lubrication | See variant options |
| Max Operating Temperature | Typically up to 90°C (194°F) |
| Corrosion Resistance | Inherent (no coating required) |
| Conductivity | Non-conductive |
| Magnetic Properties | Non-magnetic |
| Quantity per Order | See variant options |
Match the bearing's inner diameter (ID) to your shaft diameter and the outer diameter (OD) to your housing bore. For example, a 608 bearing has a 7 mm ID and 22 mm OD — common in 3D printers and inline skates. Always verify both dimensions and the thickness against your design tolerances before ordering.
POM plastic bearings are suited for light-to-moderate radial loads and light axial loads. They are not intended to replace steel bearings in heavy-load industrial machinery. For exact dynamic and static load ratings by size, contact us to confirm specifications for your specific application.
Yes. POM (polyoxymethylene) is inherently resistant to moisture, mild acids, and many solvents. Unlike steel bearings, these will not rust when exposed to water, making them well-suited for aquatic mechanisms, food-processing equipment, and outdoor or humid-environment builds.
Absolutely. The 608 size (7 mm × 22 mm × 7 mm) is one of the most common bearings in 3D printer idler pulleys and RC wheel hubs. The full POM construction reduces weight and eliminates corrosion concerns. Confirm the ID and OD match your specific printer or vehicle model's bearing seat dimensions.
Both 607 and 636 have a 6 mm ID and 19 mm OD, but they originate from different bearing series with potentially different internal geometry and tolerance grades. Similarly, 608 and 636 share the same OD (22 mm) but differ in ID. Always cross-reference the full ID × OD × Thickness specification to ensure the correct fit for your housing and shaft.
POM bearings can operate with minimal or no lubrication in many light-duty applications due to the self-lubricating properties of the material. However, for higher-speed or higher-load applications, a compatible plastic-safe grease or dry lubricant can extend service life. Avoid petroleum-based lubricants that may degrade POM over time.
POM is widely used in food-processing machinery due to its moisture resistance and non-toxic properties. However, food-grade or medical certification requirements vary by jurisdiction and application. If your project requires certified food-grade or medical-grade materials, please contact us to confirm compliance before ordering.
