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When metal bearings corrode, seize, or add unnecessary weight to your build, engineers and DIY builders turn to POM plastic deep groove ball bearings. These sealed bearings are designed for applications where moisture exposure, chemical contact, or electrical isolation rules out standard steel options — making them a reliable choice for food-processing equipment, water pumps, RC vehicles, 3D printers, and light-duty automation rigs.
Each bearing is constructed from POM (polyoxymethylene / acetal) with a matching plastic cage and races, available in RS single-sided seal or 2RS double-sided seal configurations. Inner diameters span 8–40 mm (0.31–1.57 in) and outer diameters range from 19–80 mm (0.75–3.15 in), covering popular series including 608, 6000–6006, 6200–6208, 6800–6806, and 6900–6906.
Typical use cases include skateboard and inline skate wheels requiring corrosion resistance, aquatic robotics and underwater housings where steel would rust, conveyor rollers in wet or washdown environments, and 3D printer idler pulleys where low noise and electrical non-conductivity are priorities.
| Bearing Type | Deep Groove Ball Bearing |
|---|---|
| Material | POM (Polyoxymethylene / Acetal) |
| Seal Type | RS (Single Sided) / 2RS (Double Sided) |
| Inner Diameter (ID) | 8–40 mm (0.31–1.57 in) — See variant options |
| Outer Diameter (OD) | 19–80 mm (0.75–3.15 in) — See variant options |
| Thickness | 5–18 mm (0.20–0.71 in) — See variant options |
| Bearing Series | 608, 6000–6006, 6200–6208, 6800–6806, 6900–6906 |
| Operating Temperature | Typically −40°C to +100°C (−40°F to +212°F) |
| Lubrication | Grease pre-lubricated (sealed) |
| Conductivity | Electrically non-conductive |
| Quantity per Order | See variant options |
Choose RS if only one face of the bearing is exposed to contamination or moisture — for example, when one side faces a sealed housing. Choose 2RS when both sides are exposed to dust, water, or debris, such as in outdoor equipment or washdown environments. 2RS provides more complete protection but may have marginally higher drag.
POM plastic bearings have lower dynamic and static load ratings than equivalent steel bearings. They are suited for light-to-moderate radial loads in low-to-medium speed applications. For heavy-load or high-speed industrial use, steel bearings are recommended. Contact us to confirm suitability for your specific load requirements.
Yes. POM is inherently resistant to water absorption and does not rust, making these bearings well-suited for aquatic robotics, water pumps, marine equipment, and food-processing machinery where moisture contact is unavoidable. The sealed design further limits water ingress into the raceway.
In most cases, yes — provided the ID, OD, and thickness match your existing bearing. POM bearings follow the same dimensional standards as steel equivalents in the 608, 6000, 6200, 6800, and 6900 series. Verify the variant dimensions against your housing bore and shaft diameter before ordering.
POM plastic bearings are best suited for low-to-moderate rotational speeds, typically up to a few thousand RPM depending on size and load. At very high speeds, heat generation from friction can soften the POM material. For high-speed applications, contact us to confirm the specific speed limit for your chosen size.
POM offers good resistance to mild acids, alkalis, fuels, and many organic solvents. However, it is not recommended for prolonged exposure to strong oxidizing acids or concentrated chlorine solutions. If your application involves specific chemicals, contact us to confirm compatibility before ordering.
Measure your shaft diameter (this equals the bearing ID), your housing bore (this equals the bearing OD), and the available axial space (this equals the bearing thickness). Match these three dimensions to the ID × OD × Thickness listed in the variant options. For example, a 608 bearing fits an 8 mm shaft in a 22 mm bore with 7 mm of axial space.
