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When standard steel bearings corrode, add unwanted weight, or create electrical conductivity issues in your application, engineers and DIY builders alike turn to POM plastic deep groove ball bearings as a reliable alternative. These 2RS double-sealed bearings are designed for hobbyists, robotics builders, 3D printer enthusiasts, and light-duty mechanical engineers who need a non-metallic rolling element that resists moisture, chemicals, and rust without sacrificing rotational smoothness.
Each bearing features a POM (polyoxymethylene / acetal) outer ring and cage construction with a 2RS double-sided rubber seal configuration. The available bore (inner diameter) ranges from 8 mm (0.31 in) to 40 mm (1.57 in), with outer diameters spanning 19 mm (0.75 in) to 80 mm (3.15 in) and heights from 5 mm (0.20 in) to 18 mm (0.71 in), covering series 608, 6000–6006, 6800–6806, 6900–6906, and 6200–6208.
Typical use cases include 3D printer carriage wheels and idler pulleys, RC car and drone frame pivot points, food-contact conveyor guide rollers where metal contamination must be avoided, and corrosion-prone marine or wet-environment linkages. The non-conductive POM material also makes these bearings suitable for light electrical insulation applications and MRI-adjacent equipment where ferrous components are restricted.
Non-Metallic POM Construction — The polyoxymethylene body resists rust, oxidation, and mild chemical exposure, making these bearings viable in damp, wet, or lightly corrosive environments where steel would degrade.
2RS Double-Sided Rubber Seals — Both faces are sealed to retain factory grease and block contaminants such as dust, water splash, and fine particles, reducing maintenance intervals in enclosed assemblies.
Reduced Weight vs. Steel — POM has a density of approximately 1.41 g/cm³ compared to ~7.85 g/cm³ for steel, resulting in meaningfully lighter rotating assemblies — a tangible benefit in weight-sensitive builds like drones or robotic arms.
Wide Size Range — Series 608 to 6208 — Bore diameters from 8 mm to 40 mm (0.31–1.57 in) across five bearing series (608, 6000–6006, 6800–6806, 6900–6906, 6200–6208) cover a broad range of shaft sizes in a single product listing.
Electrically Non-Conductive — POM is an insulating polymer, making these bearings suitable for applications where electrical isolation between shaft and housing is required, such as motor test rigs or sensor mounts.
Flexible Quantity Options (1–30 pcs) — Order from a single bearing for prototyping up to 30 pieces for small-batch production or maintenance stock, with per-unit pricing that scales with quantity.
| Bearing Type | Deep Groove Ball Bearing |
|---|---|
| Seal Type | 2RS (Double-sided rubber seal, both faces) |
| Material | POM (Polyoxymethylene / Acetal) outer ring & cage |
| Inner Diameter (Bore) | 8 mm – 40 mm (0.31 in – 1.57 in); see variant options |
| Outer Diameter | 19 mm – 80 mm (0.75 in – 3.15 in); see variant options |
| Height (Width) | 5 mm – 18 mm (0.20 in – 0.71 in); see variant options |
| Available Series | 608, 6000–6006, 6800–6806, 6900–6906, 6200–6208 |
| Lubrication | Pre-greased (factory-filled, sealed) |
| Operating Temperature | Typically –20 °C to +80 °C (–4 °F to +176 °F) |
| Electrical Conductivity | Non-conductive (POM insulating polymer) |
| Quantity per Order | 1 / 5 / 10 / 15 / 20 / 25 / 30 pcs; see variant options |
| Dimensional Standard | Metric (ISO standard bore/OD/height) |
Match the bearing's inner diameter (bore) to your shaft diameter and the outer diameter to your housing bore. For example, if your shaft is 8 mm and your housing accepts a 22 mm OD, select the 608 variant (8×22×7 mm). Always verify the height (width) fits within your axial space. Refer to the Model:ID×OD×Height option in the variant selector for exact dimensions.
POM plastic bearings are designed for light-to-moderate radial loads in low-to-medium speed applications. They are not rated for the same dynamic or static load capacity as equivalent steel bearings. They are well-suited for 3D printer carriages, RC vehicles, conveyor guides, and similar light-duty mechanisms. For heavy industrial loads or high-RPM shafts, a steel bearing is more appropriate.
Yes. POM (polyoxymethylene) has good resistance to water, mild acids, and many common solvents. The 2RS double-sided seals further protect the internal grease and rolling elements from moisture ingress. These bearings are suitable for damp or splash-prone environments such as outdoor robotics, marine guide rails, and food-adjacent conveyor systems where metal contamination must be minimized.
POM has a continuous service temperature of approximately –20 °C to +80 °C (–4 °F to +176 °F). Sustained exposure above 80 °C can cause dimensional creep and reduced load capacity. For higher-temperature environments (above 100 °C), consider PEEK or ceramic bearings instead. These POM bearings are not suitable for oven, autoclave, or high-friction high-speed applications.
Yes. These bearings follow standard ISO metric dimensions for bore, outer diameter, and height — the same dimensional envelope as equivalent steel deep groove ball bearings in the same series (e.g., 608, 6200, 6800). They are drop-in compatible with housings and shafts designed for standard metric bearings of the same series, provided the load and temperature requirements are within POM's operating range.
These series differ in the ratio of outer diameter to bore diameter, which affects load capacity and space requirements. The 6800 series (thin-section) has the smallest OD-to-bore ratio, making it ideal for compact assemblies. The 6200 series has a larger OD relative to bore, offering higher load capacity. The 608 is a widely used general-purpose size (8×22×7 mm). Choose based on your shaft size, available housing space, and load requirements.
Order 1 piece for prototyping or a single repair. For small production runs, maintenance kits, or builds requiring multiple identical bearings (e.g., 3D printers with 6–12 carriage bearings), ordering 10–30 pieces reduces per-unit cost. The quantity options (1, 5, 10, 15, 20, 25, 30 pcs) are listed in the Qty(pcs) variant selector above.
