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When a standard steel bearing corrodes, seizes, or adds unwanted weight to a lightweight mechanism, engineers and DIY builders working in food-contact, medical, marine, or chemical-adjacent environments need a non-metallic alternative that still delivers reliable radial load capacity. These POM plastic deep groove ball bearings with RS (rubber-sealed) shields fill that gap — available in bore sizes from 8 mm to 12 mm (~0.315 in to ~0.472 in) with quantity options from single-piece to 30-piece packs.
Each bearing features a POM (polyoxymethylene / acetal) outer ring, inner ring, and cage, with steel or stainless rolling elements and a rubber contact seal (RS) on one or both sides to retain lubrication and exclude contaminants. Bore sizes span 8 mm to 12 mm, with outer diameter and width varying by bore size in line with standard deep-groove bearing dimensional series. The POM construction reduces bearing mass by approximately 50–60% compared to an equivalent all-steel unit and eliminates galvanic corrosion in mixed-material assemblies.
Typical use cases include conveyor rollers and guide wheels in food-processing lines where metal contamination must be avoided, lightweight pivot bearings in medical device housings and laboratory instruments, corrosion-resistant support bearings in marine deck hardware and wet-area fixtures, and low-noise rolling elements in 3D-printer carriage assemblies and hobbyist robotics where reduced rotational inertia is beneficial.
Single rubber contact seal (RS) retains factory-applied grease and excludes dust and light moisture, extending service intervals in moderately contaminated environments without requiring frequent relubrication.
Polyoxymethylene rings and cage deliver inherent corrosion resistance, low moisture absorption, and a self-lubricating surface that reduces friction in slow-to-medium speed applications without additional grease in many cases.
Reduced bearing mass lowers rotational inertia in high-cycle mechanisms and reduces total assembly weight in portable or weight-sensitive equipment without sacrificing dimensional interchangeability.
Four bore sizes in a single listing cover the most common small-to-mid bore requirements in food, medical, and light industrial applications, with quantity options from 1 to 30 pieces per order.
POM material dampens vibration and reduces operational noise compared to all-steel bearings, making these units well-suited for laboratory instruments, medical devices, and consumer electronics where acoustic performance matters.
POM construction makes these bearings suitable for MRI-adjacent equipment, electromagnetic-sensitive assemblies, and applications where electrical isolation between shaft and housing is required.
| Ring & Cage Material | POM (polyoxymethylene / acetal) |
|---|---|
| Rolling Element Material | See variant options |
| Seal Type | RS (rubber contact seal, one side) |
| Bore (I.D.) Range | 8 mm – 12 mm (0.315 in – 0.472 in) |
| Outer Diameter | See variant options |
| Width | See variant options |
| Bearing Type | Deep groove ball bearing (single row) |
| Max Operating Temperature | Approximately −40°C to +80°C (−40°F to +176°F) |
| Load Direction | Radial (primary); light axial |
| Lubrication | Factory-greased (retained by RS seal) |
| Pack Quantity Options | 1, 5, 10, 15, 20, or 30 pieces |
| Weight (per piece) | See variant options |
Measure your shaft diameter with a micrometer or digital caliper. The bearing bore (I.D.) must match the shaft diameter within the standard interference or clearance fit tolerance for your application. For a light press fit on a rotating shaft, the bore should be 0–0.01 mm smaller than the shaft. For a sliding or locating fit, match the bore to the shaft diameter exactly. Always verify the outer diameter and width against your housing drawing as well.
POM bearings carry lower dynamic and static load ratings than equivalent all-steel bearings due to the lower compressive strength of the polymer rings. They are suited for light-to-moderate radial loads at low-to-medium speeds. For heavy radial loads, high-speed spindle applications, or shock-load environments, a steel or stainless steel bearing is more appropriate. Contact us to confirm load suitability for your specific duty cycle.
POM (acetal) is a food-safe polymer approved for incidental food contact in many jurisdictions. The RS rubber seal helps exclude water and light contaminants. For direct food-contact or full washdown applications, confirm that the rolling element material and lubricant are also food-grade rated. Contact us to confirm the specific configuration available for your compliance requirements.
POM (polyoxymethylene) begins to soften and lose dimensional stability above approximately 80°C (176°F) under sustained load. For applications with operating temperatures above this threshold — such as near motors, ovens, or steam lines — a PEEK, ceramic, or stainless steel bearing is recommended instead. Short-term peak temperatures up to approximately 100°C may be tolerable without load, but sustained operation above 80°C is not advised.
POM rings are inherently corrosion-resistant and absorb minimal moisture, making them suitable for damp and splash environments. The RS rubber seal provides additional protection against water ingress. For fully submerged or high-pressure washdown applications, verify that the rolling element material (steel vs. stainless) and lubricant are compatible with continuous water exposure. Stainless rolling elements are recommended for prolonged wet service.
POM deep-groove ball bearings are manufactured to the same dimensional standards as steel equivalents (ISO 15, 6000, 6200, or 6300 series depending on bore and OD), so they are dimensionally interchangeable in most housings. However, load ratings, speed limits, and temperature ranges differ. Always verify that the POM bearing's rated capacity meets your application requirements before substituting for a steel unit.
These bearings are factory-greased and sealed with an RS rubber contact seal, so they are ready to install without additional lubrication in most applications. POM's inherent low-friction surface also reduces grease consumption. For extended service intervals or high-cycle applications, inspect the bearing periodically and regrease if the seal allows access, or replace the bearing when noise or play increases.
