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When metal bearings corrode, seize, or add unwanted weight to your build, engineers and makers reach for a non-metallic alternative. POM (polyoxymethylene) plastic deep groove ball bearings are designed for applications where moisture exposure, chemical contact, or electrical isolation rules out steel — making them a go-to choice for RC vehicles, 3D printer carriages, food-processing fixtures, marine hardware, and lightweight automation rigs.
Each bearing features a POM (acetal) outer ring, inner ring, and ball cage, with stainless steel or nylon balls depending on the series. The deep groove raceway geometry supports both radial and moderate axial loads. Available in over 60 standard sizes spanning the 60x, 62x, 63x, 68x, 69x, 6800, 6900, and 6200 series — inner diameters from 3 mm (≈ 0.12 in) to 70 mm (≈ 2.76 in), outer diameters from 7 mm (≈ 0.28 in) to 100 mm (≈ 3.94 in).
Typical use cases include skateboard and longboard wheel cores requiring corrosion resistance, CNC router Z-axis carriages where lubricant contamination must be avoided, aquatic robotics and underwater drone thrusters, and food-grade conveyor guide rollers where metal particle contamination is a concern.
| Bearing Type | Deep Groove Ball Bearing |
|---|---|
| Material — Rings & Cage | POM (Polyoxymethylene / Acetal) |
| Rolling Elements | Stainless steel or nylon balls (series-dependent) |
| Inner Diameter Range | 3 mm – 70 mm (≈ 0.12 in – 2.76 in) |
| Outer Diameter Range | 7 mm – 100 mm (≈ 0.28 in – 3.94 in) |
| Width Range | 2 mm – 19 mm (≈ 0.08 in – 0.75 in) |
| Series Available | 60x, 62x, 63x, 68x, 69x, 6800, 6900, 6200 (see variant options) |
| Waterproof | Yes — open design, POM material inherently moisture-resistant |
| Corrosion Resistance | Yes — resistant to water, mild acids, and alkalis |
| Electrical Conductivity | Non-conductive |
| Operating Temperature | Typically –40 °C to +100 °C (–40 °F to +212 °F); verify for high-heat applications |
| Load Capacity | See variant options — varies by size and series |
| Lubrication | See variant options |
| Pack Quantity | Pack of 1 or Pack of 5 (select above) |
| Dimensional Standard | ISO 15 metric deep groove ball bearing |
Match the bearing's inner diameter (bore) to your shaft diameter, the outer diameter to your housing bore, and the width to your available axial space. The size designation in each variant follows the format: Series Number – Inner Diameter × Outer Diameter × Width (all in mm). For example, 608 – 8×22×7 mm means an 8 mm bore, 22 mm outer diameter, and 7 mm width. Always measure your existing bearing or housing before ordering.
POM bearings handle moderate radial and light axial loads well. They are widely used in 3D printers, RC vehicles, light conveyor systems, and hobby robotics. They are not recommended for heavy industrial machinery, high-impact loads, or sustained speeds above approximately 3,000–5,000 RPM (varies by size). If your application involves significant shock loads or continuous high-speed operation, a steel bearing with appropriate sealing may be more suitable.
The POM rings and cage do not absorb water or corrode when submerged or exposed to moisture. These bearings are open-type (no rubber seals), so water can enter the raceway. In fully submerged applications, the rolling elements and any retained lubricant should be compatible with water exposure. For intermittent splash or humid environments, they perform reliably without additional sealing.
Yes. POM is resistant to water, mild acids, dilute alkalis, and many common solvents. This makes these bearings suitable for food-processing equipment, marine hardware, chemical handling fixtures, and outdoor applications where steel would rust. For aggressive chemical environments, confirm compatibility with your specific media before use.
POM has inherent low-friction properties and can run dry in light-load, low-speed applications. For higher loads or speeds, a light grease or PTFE-based lubricant compatible with plastic is recommended. Avoid petroleum-based lubricants that may degrade POM over time. In wet environments, water itself can act as a mild lubricant.
These designations refer to ISO bearing series with different outer diameter-to-bore ratios and widths. The 60x series (603–609) are miniature bearings with small outer diameters relative to bore. The 62x series (6200–6209) have a wider outer ring for higher radial load capacity. The 68x and 69x series are thin-section bearings with a narrow width relative to bore — useful where axial space is limited. The 6800 and 6900 series are extra-thin section bearings. Select based on your housing geometry and load requirements.
Yes. Both pack options contain identical bearings of the selected size. Pack of 5 is offered at a lower per-unit cost and is suited for production builds, repair stock, or projects requiring multiple bearings of the same size.
