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When standard metal bearings leave marks on rails, damage delicate surfaces, or generate unwanted noise in your build, a rubber-coated alternative makes a measurable difference. These polyurethane molded ball bearings are designed for makers, fabricators, and DIY builders who need a rolling element that grips, cushions, and glides without scratching the contact surface.
Each unit consists of a steel ball bearing core encased in a molded polyurethane (PU) rubber outer shell. Available in inner diameter × outer diameter × thickness combinations ranging from 5×16×5mm (approx. 0.20"×0.63"×0.20") up to 10×40×10mm (approx. 0.39"×1.57"×0.39"), with colour options including Black, Transparent, and Blue. Sold individually (1 pc per listing).
Typical applications include sliding door guide wheels, linear rail followers, conveyor pulley systems, 3D printer carriage wheels, and custom furniture roller assemblies — anywhere a low-noise, surface-safe rolling contact is needed.
| Material — Outer Shell | Polyurethane (PU) Rubber |
|---|---|
| Material — Core | Steel Ball Bearing |
| Inner Diameter (ID) Range | 5 mm – 10 mm (approx. 0.20" – 0.39") |
| Outer Diameter (OD) Range | 16 mm – 40 mm (approx. 0.63" – 1.57") |
| Thickness Range | 5 mm – 15 mm (approx. 0.20" – 0.59") |
| Available Sizes (ID×OD×T) | 5×16×5mm, 5×18×5mm, 6×20×5mm, 8×22×5mm, 8×35×15mm, 10×40×10mm |
| Colour Options | Black, Transparent, Blue |
| Quantity per Unit | 1 pc |
| Load Capacity | See variant options |
| Max Operating Speed | See variant options |
| Weight (per piece) | See variant options |
Match the Inner Diameter (ID) to your axle or shaft diameter — this is the most critical dimension. Then confirm the Outer Diameter (OD) fits within your track or housing clearance, and check that the Thickness suits your frame spacing. All sizes are listed as ID×OD×Thickness in millimetres on the variant selector.
Load capacity varies by size — larger OD and thicker wheels generally support higher radial loads. These wheels are designed for light-to-medium duty DIY and maker applications such as sliding doors, 3D printer carriages, and display fixtures. For heavy industrial loads, please contact us to confirm suitability for your specific application.
The polyurethane outer shell is resistant to moisture and mild chemicals, making it suitable for indoor environments with occasional humidity exposure. The steel bearing core may be susceptible to rust if submerged or exposed to prolonged moisture. For wet or outdoor environments, we recommend inspecting and lubricating the bearing core periodically.
These guide wheels work on flat tracks, round rails, and smooth surfaces where the OD makes rolling contact. They are not profiled for V-slot grooves unless the OD is wide enough to span the slot. Always verify that your axle diameter matches the listed ID before ordering.
The colour difference is in the polyurethane outer shell only — the steel bearing core and dimensional specifications are identical across colours for the same size. Choose based on your build aesthetic or to visually distinguish wheel positions in a multi-wheel assembly.
Yes — the smaller sizes (5×16×5mm, 5×18×5mm, 6×20×5mm) are commonly used on 3D printer carriage assemblies and lightweight CNC gantries where a smooth, low-noise rolling contact is needed. Confirm the ID matches your carriage bolt or eccentric nut diameter before purchasing.
Each listing is for 1 piece (1 pc). If you need multiple wheels for a project, simply adjust the quantity at checkout or select the quantity that matches your build requirements.
