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When a seized bearing brings a project to a standstill — whether it's a drone motor, a skateboard wheel, or a small appliance — finding the exact replacement fast matters. These miniature deep groove ball bearings in the NO.6 series are designed for engineers, hobbyists, and repair technicians who need a reliable, dimensionally accurate bearing without guesswork.
Each bearing in this listing is a shielded, single-row deep groove ball bearing conforming to the NO.6 series standard. Inner diameters range from 2 mm to 40 mm (approx. 0.08 in to 1.57 in), outer diameters from 5 mm to 75 mm (approx. 0.20 in to 2.95 in), and thickness from 2.5 mm to 16 mm (approx. 0.10 in to 0.63 in). The steel shield on both sides retains grease and blocks contaminants without adding significant drag. Available in quantities of 1, 2, 4, or 10 pieces per order.
These miniature deep groove ball bearings suit a wide range of applications: replacing worn bearings in RC car wheel hubs and motor shafts, servicing inline skate or skateboard wheels, and maintaining small electric motors in power tools or appliances. The standardized NO.6 series numbering (600, 603–609, 623–629, 635–639, 674–679, 682–689, 692–699, 6200–6201, 6700–6706, 6800, 6008–6009) makes cross-referencing straightforward.
| Bearing Type | Single-row deep groove ball bearing, shielded (ZZ) |
|---|---|
| Series | NO.6 (600, 603–609, 623–629, 635–639, 674–679, 682–689, 692–699, 6200–6201, 6700–6706, 6800, 6008–6009) |
| Inner Diameter (Bore) | 2 mm – 40 mm (approx. 0.08 in – 1.57 in) |
| Outer Diameter | 5 mm – 75 mm (approx. 0.20 in – 2.95 in) |
| Thickness (Width) | 2.5 mm – 16 mm (approx. 0.10 in – 0.63 in) |
| Shield Type | Double-shielded steel (both sides) |
| Lubrication | Factory-greased |
| Material | See variant options |
| Load Direction | Radial + moderate axial (both directions) |
| Available Quantities | 1 Pcs / 2 Pcs / 4 Pcs / 10 Pcs |
| Exact Size per Variant | See variant options (I.D × O.D × Thickness listed per bearing number) |
Locate the bearing number stamped on the shield or outer ring of your existing bearing — it will typically read something like 625, 6200, or 6702. If the number is worn off, measure the inner diameter (bore), outer diameter, and thickness with calipers, then match those dimensions to the size listed in the variant options. The format is I.D × O.D × Thickness in millimeters.
Yes. Single-row deep groove ball bearings in the NO.6 series are a standard choice for high-speed, low-noise applications including small electric motors, spindles, and fans. The double-shield design retains grease at speed while limiting contamination ingress. For very high-speed or high-temperature environments, confirm the specific speed rating with your application requirements before ordering.
A shielded bearing uses thin steel plates (shields) that sit close to — but do not contact — the inner ring. This creates a non-contact barrier that retains grease and blocks larger particles with minimal friction. A sealed bearing uses a rubber or synthetic lip that contacts the inner ring, providing better contamination protection but slightly higher drag. Shielded bearings are preferred when low torque and higher speed are priorities.
Deep groove ball bearings can handle moderate axial loads in both directions alongside their primary radial load capacity. They are not designed for heavy or predominantly axial loads — for those applications, angular contact or thrust bearings are more appropriate. For typical DIY and light-industrial uses such as wheels, motors, and fans, the axial capacity of these bearings is generally sufficient.
For a single repair, 1 or 2 pieces is usually sufficient — many applications use bearings in pairs (one on each side of a shaft). If you are servicing multiple units or want to keep spares on hand, 4 or 10 pieces offers a lower per-unit cost. Check the price per piece across quantity options before selecting.
Standard steel deep groove ball bearings offer limited corrosion resistance. The steel shields and factory grease provide basic protection against light moisture exposure, but these bearings are not rated for continuous wet or submerged environments. For applications with regular water exposure — such as outdoor equipment or marine use — consider stainless steel or ceramic hybrid bearings instead, and contact us to confirm availability.
NO.6 series miniature deep groove ball bearings are widely used in RC cars, drones, and model aircraft (motor and wheel bearings), inline skates and skateboards, small household appliances (fans, mixers, power tools), 3D printer carriages and extruder motors, and precision instruments. Their compact dimensions and standardized numbering make them one of the most commonly replaced bearing types in DIY and light-industrial repair.
