Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When metal bearings corrode, add unwanted weight, or interfere with sensitive electronics, engineers and DIYers reach for a non-metallic alternative. These PP nylon plastic precision ball bearings with glass rolling elements are designed for applications where standard steel bearings fall short — including wet environments, food-adjacent machinery, and magnetically sensitive assemblies.
Each bearing consists of a polypropylene (PP) nylon outer and inner race paired with precision glass balls. The range covers nine standard sizes from 626 (6×19×6 mm / 0.24"×0.75"×0.24") through 6006 (30×55×13 mm / 1.18"×2.17"×0.51"), with bore diameters spanning 6 mm to 30 mm. Available in packs of 1, 2, 5, 10, or 25 pieces to suit both prototyping and production runs.
Typical use cases include light-duty conveyor rollers in wash-down environments, 3D printer carriage assemblies where reduced rotating mass improves acceleration, RC vehicle wheel hubs requiring non-conductive bearings, and laboratory or medical equipment where metal contamination must be avoided. The glass ball construction also makes these bearings a practical choice for corrosion-resistant skateboard or inline skate wheel replacements in coastal or humid climates.
| Bearing Type | Deep groove ball bearing (open, no seal) |
|---|---|
| Race Material | Polypropylene (PP) nylon |
| Rolling Element | Precision glass balls |
| Available Sizes | 626, 608, 6000, 6001, 6002, 6003, 6004, 6005, 6006 |
| Bore Diameter (d) | 6 mm – 30 mm (see variant options) |
| Outer Diameter (D) | 19 mm – 55 mm (see variant options) |
| Width (B) | 6 mm – 13 mm (see variant options) |
| Dimensional Standard | ISO 15 / 6-series |
| Operating Temperature | Typically –10°C to +80°C (14°F to 176°F) |
| Max Radial Load | See variant options — lower than equivalent steel bearing |
| Lubrication | Dry / unlubricated (grease compatible if required) |
| Pack Quantities | 1, 2, 5, 10, 25 pcs |
| Conductivity | Non-conductive |
| Magnetic Properties | Non-magnetic |
Select the 608 (8×22×7 mm) variant. This is the most widely used bearing size in skateboards, inline skates, and fidget spinners. The bore is 8 mm, outer diameter 22 mm, and width 7 mm — identical dimensions to a standard steel 608 bearing, so it drops directly into the same housing.
PP nylon bearings carry significantly lower radial and axial loads than equivalent steel bearings. They are suited for light-duty, low-speed applications (typically under 3,000 RPM and light radial loads). For heavy machinery, high-speed spindles, or impact-loaded assemblies, a steel bearing is the appropriate choice. Contact us to confirm load suitability for your specific application.
Yes. Polypropylene resists fresh water, salt water, and many mild chemicals without rusting or pitting. Glass balls are similarly inert. These bearings are a practical choice for outdoor equipment, coastal environments, and wash-down applications where steel bearings would corrode. Avoid prolonged exposure to strong solvents or concentrated acids.
Yes — each size follows the same outer diameter and width as the equivalent steel 6-series bearing (ISO 15). A 6004 PP bearing, for example, has the same 42 mm OD and 12 mm width as a steel 6004. Fit it into the same housing with the same press or snap-fit method. Note that PP nylon has a slightly higher thermal expansion coefficient than steel, so check clearances if the assembly will see significant temperature swings.
PP nylon and glass are both non-toxic and free of metal contamination risk, making these bearings a common choice in light-duty food-adjacent and laboratory equipment. However, they are not certified food-grade (FDA/EC 1935/2004) out of the box. If regulatory compliance is required for direct food contact, please contact us to confirm suitability or request documentation.
These bearings are supplied dry (unlubricated). For most light-duty, low-speed applications they can be run dry. If your application involves continuous rotation at moderate speeds, applying a small amount of PTFE-based or silicone grease compatible with polypropylene will extend service life. Avoid petroleum-based greases, which can degrade PP over time.
The 608 (8×22×7 mm) has an 8 mm bore and is the most widely used size globally — found in skateboards, scooters, and countless small appliances. The 626 (6×19×6 mm) has a smaller 6 mm bore and is common in RC cars, small motors, and precision instruments. Choose based on your shaft diameter: 6 mm shaft → 626; 8 mm shaft → 608.
