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When standard steel bearings corrode, seize, or add unwanted weight to a precision assembly, engineers and DIY builders alike turn to POM plastic thin-walled bearings with glass balls. These bearings are engineered for applications where chemical exposure, moisture, or weight constraints make metal bearings impractical — from food-processing jigs and laboratory equipment to RC models, 3D printer carriages, and custom automation fixtures.
Each bearing consists of a POM (polyoxymethylene acetal) inner and outer ring paired with precision glass balls and a double-seal (2RS) configuration that keeps contaminants out without requiring external lubrication. Available across three series — 6800, 6900, and 6200 — with inner diameters ranging from 10 mm (0.39 in) to 40 mm (1.57 in) and outer diameters from 19 mm (0.75 in) to 80 mm (3.15 in). Wall thickness (THK) ranges from 5 mm to 18 mm depending on the selected size.
Typical use cases for these POM plastic thin-walled bearings include low-load rotary joints in corrosive environments, lightweight spindle assemblies in hobby CNC machines, non-magnetic bearing positions in medical or electronic devices, and replacement bearings in food-safe conveyor systems where metal contamination must be avoided.
| Bearing Series | 6800, 6900, 6200 (metric, thin-walled) |
|---|---|
| Inner Diameter (ID) | 10 mm – 40 mm (0.39 in – 1.57 in); see variant options |
| Outer Diameter (OD) | 19 mm – 80 mm (0.75 in – 3.15 in); see variant options |
| Thickness (THK) | 5 mm – 18 mm; see variant options |
| Ring Material | POM (Polyoxymethylene / Acetal) |
| Rolling Element Material | Glass balls |
| Seal Type | Double rubber contact seal (2RS, both sides) |
| Lubrication | Dry / light grease compatible; no pre-lubrication required |
| Max Operating Temperature | Typically up to 80 °C (176 °F) |
| Load Type | Radial; low-to-medium load applications |
| Magnetic Properties | Non-magnetic |
| Electrical Properties | Non-conductive (glass balls + POM rings) |
| Available Quantities | 1, 2, 4, 10, 15, 20, 25 pcs per order |
| Weight per Unit | See variant options (varies by size) |
Match the bearing's inner diameter (ID) to your shaft diameter and the outer diameter (OD) to your housing bore. The size option label follows the format: Series-ID*OD*THK (e.g., 6802-2RS-15*24*5 means ID 15 mm, OD 24 mm, thickness 5 mm). Measure your shaft and housing with calipers before selecting. If your shaft is between standard sizes, choose the next smaller ID and adjust the housing accordingly.
POM plastic bearings with glass balls are designed for low-to-medium radial loads in applications where weight, corrosion resistance, or non-conductivity is the primary requirement. They are not suitable for heavy radial or axial shock loads. Typical applications include 3D printer axes, RC vehicle wheels, laboratory instruments, and light conveyor rollers. For heavy-duty industrial loads, steel bearings are more appropriate.
Yes. POM (acetal) rings resist moisture, mild acids, alkalis, and many common solvents. The glass balls are fully corrosion-proof. The 2RS double seal further protects the interior from water ingress. These bearings are well-suited for humid environments, light washdown conditions, and applications where rust from steel bearings would be a contamination risk — such as food-processing fixtures or outdoor equipment.
All three are metric deep-groove ball bearing series, but they differ in cross-section dimensions relative to bore size. The 6800 series has the thinnest cross-section (smallest OD and THK for a given ID), making it ideal for the most space-constrained designs. The 6900 series has a slightly larger cross-section, offering a balance between compactness and load capacity. The 6200 series has the largest cross-section of the three, providing greater load capacity and rigidity. Choose based on your available radial and axial space and the load your application requires.
POM has a continuous service temperature limit of approximately 80 °C (176 °F). Sustained exposure above this threshold can cause dimensional changes and reduced mechanical strength in the rings. For applications involving elevated temperatures — such as near motors, ovens, or steam — consider alternative materials. These bearings perform reliably at room temperature and in moderately warm environments up to the stated limit.
Select the quantity that matches your immediate project needs plus a reasonable spare allowance. Single-piece (1 pc) orders are suitable for prototyping or one-off repairs. Packs of 4 or 10 are practical for small assemblies with multiple bearing positions. Packs of 15, 20, or 25 offer a lower per-unit cost and are recommended for small-batch production, maintenance stock, or multi-axis machines. The per-unit price decreases as quantity increases, so ordering a larger pack upfront is often more economical if you anticipate future use.
