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When a worn or undersized bearing causes wobble, noise, or premature failure in your build, finding the exact replacement size quickly is what matters most. Hobbyists, makers, and mechanical repair technicians who work with compact rotating assemblies need a reliable source for miniature deep groove ball bearings across a wide size range — without ordering from multiple suppliers.
Each pack contains 4 identical deep groove ball bearings with double-steel shields (ZZ or ZRS designation). Inner diameters span 2–9 mm (approx. 0.08–0.35 in), outer diameters 5–30 mm (approx. 0.20–1.18 in), and widths 2.5–10 mm (approx. 0.10–0.39 in), covering 43 standard models from 603ZZ through 699ZZ. Rings and rolling elements are steel; the ZZ shield keeps grease in and light contaminants out without adding significant drag.
These deep groove ball bearings are well-suited for RC car wheel hubs and motor shafts, 3D printer extruder and axis carriages, inline skate and skateboard wheels, small power-tool spindles, and DIY robotics joint pivots — anywhere a compact, low-friction radial bearing is required.
| Bearing Type | Deep Groove Ball Bearing |
|---|---|
| Shield Type | ZZ (double steel shield) / ZRS (steel + rubber seal) |
| Inner Diameter (ID) | 2–9 mm (0.08–0.35 in) — see variant options |
| Outer Diameter (OD) | 5–30 mm (0.20–1.18 in) — see variant options |
| Width / Thickness | 2.5–10 mm (0.10–0.39 in) — see variant options |
| Model Range | 603ZZ to 699ZZ (43 models) |
| Quantity per Pack | 4 pieces |
| Ring & Ball Material | Steel |
| Lubrication | Pre-greased |
| Load Direction | Radial (primary); light axial loads supported |
| Operating Temperature | See variant options |
| Certification / Standard | Contact us to confirm |
Match the three dimensions of your existing bearing: inner diameter (ID), outer diameter (OD), and width. These are typically stamped on the bearing shield or listed in your equipment's service manual. Select the matching model number from the variant dropdown above — each option lists ID × OD × width in millimeters.
ZZ bearings have a steel shield on both sides, providing good dust protection with minimal friction. ZRS bearings have a steel shield on one side and a rubber contact seal on the other, offering slightly better sealing against moisture and fine particles. For most dry, indoor applications ZZ is sufficient; choose ZRS where light moisture exposure is possible.
Deep groove ball bearings are primarily designed for radial loads. They can accommodate moderate axial loads in both directions, but they are not a substitute for dedicated thrust bearings in applications where axial force is the dominant load. For mixed radial and light axial loads — such as RC motor shafts or printer lead screws — these bearings are appropriate.
Yes, each bearing comes pre-greased from the factory. The ZZ steel shields are non-contact and can be carefully removed with a thin pick to allow re-greasing if needed. Use a bearing-grade lithium or synthetic grease; avoid over-packing, which increases drag and heat.
Many 3D printers use 608ZZ (8 × 22 × 7 mm) bearings for extruder idlers and axis rods. Common RC car and skateboard applications also use 608ZZ or 688ZZ. Check your equipment's bearing specification first, then select the matching variant. With 43 sizes available, most miniature bearing applications in the 2–9 mm ID range are covered.
Rated load capacity varies by model size — larger bearings carry higher loads. For specific dynamic and static load ratings (C and C₀ values) for your chosen model, please contact us to confirm. As a general guide, miniature bearings in the 603–699 series are suited for light-to-moderate loads typical of hobby, maker, and small-appliance applications.
Each listing is sold as a pack of 4 identical bearings. This pack quantity is practical for symmetrical assemblies (e.g., four wheels on an RC car) and ensures you have spares on hand for future maintenance without reordering.
