POM Plastic Bearing 603 - 6812 Deep Groove Ball Bearings Waterproof Various Size

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.