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Sourcing a single carbon steel ball bearing in exactly the right metric size shouldn't require a bulk order or a long wait. Whether you're a hobbyist repairing an RC car, a maker upgrading a 3D printer carriage, or a technician replacing a worn pivot in a small appliance, these individual carbon steel ball bearings let you order exactly what you need — one bearing at a time.
Each bearing is a shielded deep-groove ball bearing (ZZ or Z designation) manufactured from carbon steel, with double metal shields that retain factory grease and block particulate contamination. The range covers 13 standard metric models from 623ZZ to 6808Z, with inner diameters from 3 mm to 40 mm (approx. 0.12–1.57 in), outer diameters from 10 mm to 52 mm (approx. 0.39–2.05 in), and widths from 4 mm to 10 mm (approx. 0.16–0.39 in).
These carbon steel ball bearings are a practical fit for skateboard wheel cores, inline skate axles, small electric motor shafts, CNC router spindle housings, and fidget mechanism pivots — wherever a compact, shielded rolling element is needed to reduce friction and extend service life.
| Bearing Type | Deep-Groove Ball Bearing |
|---|---|
| Material | Carbon Steel |
| Shield Type | Double metal shield (ZZ) or single metal shield (Z) |
| Inner Diameter (ID) Range | 3 mm – 40 mm (0.12 – 1.57 in) |
| Outer Diameter (OD) Range | 10 mm – 52 mm (0.39 – 2.05 in) |
| Width Range | 4 mm – 10 mm (0.16 – 0.39 in) |
| Available Models | 623ZZ, 624ZZ, 625ZZ, 626ZZ, 627ZZ, 628ZZ, 629ZZ, 6200ZZ, 6201ZZ, 6805Z, 6806Z, 6807Z, 6808Z |
| Quantity per Order | 1 piece |
| Load Direction | Radial + moderate axial |
| Lubrication | Grease-packed (factory pre-lubricated) |
| Operating Temperature | Typically −10°C to +110°C (14°F to 230°F) |
| Corrosion Resistance | Contact us to confirm |
Measure three dimensions on your existing bearing or housing: inner diameter (ID — the bore that fits your shaft), outer diameter (OD — the dimension that fits your housing), and width (the axial thickness). Cross-reference these against the model table in the variant selector above. For example, if your shaft is 5 mm, your housing bore is 16 mm, and the width is 5 mm, you need a 625ZZ.
ZZ indicates double metal shields — one on each side of the bearing. Z indicates a single metal shield on one side only. Shields retain the factory grease and block coarse contaminants. They are not fully sealed (that designation is RS or 2RS with rubber seals), so they are best suited for dry to moderately dusty environments rather than wet or submerged conditions.
Yes. The deep-groove raceway design supports radial loads as the primary direction and can accommodate moderate axial (thrust) loads in both directions simultaneously. They are not intended for heavy sustained axial-only loading — a dedicated thrust bearing would be more appropriate for that use case. For typical hobby and light-mechanical applications, these bearings handle combined loading reliably.
Carbon steel bearings offer limited corrosion resistance and are not recommended for prolonged exposure to water, salt spray, or corrosive chemicals. For outdoor or moisture-exposed applications, stainless steel bearings (typically 440C grade) are a more appropriate choice. Contact us to ask about stainless alternatives if your application involves humidity or washdown conditions.
No. These bearings are factory pre-lubricated with grease and are ready to install straight from the packaging. Avoid washing out the factory grease with solvents before installation. If your application runs at very high speeds or elevated temperatures, you may want to re-lubricate with a grease rated for those conditions after the initial run-in period.
Always apply installation force to the ring being pressed — inner ring when pressing onto a shaft, outer ring when pressing into a housing bore. Never apply force across the rolling elements, as this causes brinelling (indentation of the raceway surface) and premature failure. Use a bearing press, a correctly sized socket, or a stepped installation sleeve. For very small bearings (e.g., 623ZZ), a hand press or arbor press with a close-fitting punch is sufficient.
Yes. Each model is listed as a separate variant on this product page. Add the first model to your cart, then return to the variant selector to choose a different model and add that to the same cart. This allows you to mix sizes within a single order without needing to place separate transactions.
