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When a worn or undersized bearing causes wobble, noise, or premature failure in your machinery, finding a dimensionally accurate replacement in a corrosion-resistant grade is rarely straightforward. These deep groove ball bearings are designed for engineers, machinists, hobbyists, and maintenance professionals who need a dependable, drop-in solution across a wide range of shaft sizes.
Available in two material grades — 440 Stainless Steel and 304 Stainless Steel — these bearings feature double metal shields (ZZ) on both faces to retain grease and exclude contaminants. The series spans nine sizes from S6300ZZ to S6308ZZ, covering bore diameters from 10 mm (0.394 in) to 40 mm (1.575 in), outer diameters from 35 mm (1.378 in) to 90 mm (3.543 in), and widths from 11 mm (0.433 in) to 23 mm (0.906 in).
Typical applications include electric motor shaft support, conveyor roller assemblies, skateboard and inline skate wheel hubs, 3D printer carriage systems, and light industrial gearbox rebuilds — anywhere a compact, sealed deep groove ball bearing for stainless steel shaft is required.
| Bearing Series | 6300 (S6300ZZ – S6308ZZ) |
|---|---|
| Shield Type | Double Metal Shield (ZZ) |
| Available Materials | 440 Stainless Steel / 304 Stainless Steel |
| Bore Diameter (ID) | 10 mm – 40 mm (0.394 in – 1.575 in) — see variant options |
| Outer Diameter (OD) | 35 mm – 90 mm (1.378 in – 3.543 in) — see variant options |
| Width (T) | 11 mm – 23 mm (0.433 in – 0.906 in) — see variant options |
| Lubrication | Factory-greased (sealed by metal shields) |
| Load Direction | Radial + moderate axial (both directions) |
| Operating Temperature | See variant options |
| Pack Quantity Options | 1 / 2 / 3 / 4 / 5 / 10 pieces |
| Bearing Type | Deep Groove Ball Bearing |
| Weight per Unit | See variant options |
Select the bearing whose bore diameter (ID) matches your shaft diameter. For example, if your shaft is 20 mm, choose S6304ZZ (20 mm × 52 mm × 15 mm). Always confirm the outer diameter (OD) and width (T) fit your housing before ordering. The full size chart is shown in the variant selector above.
440 Stainless Steel is a martensitic grade that can be hardened to high Rockwell values, giving it greater load capacity and wear resistance — ideal for higher-speed or higher-load applications. 304 Stainless Steel is an austenitic grade with superior corrosion resistance in humid, marine, or mildly acidic environments where rust prevention is the priority over maximum hardness.
These are shielded bearings (ZZ designation), meaning they use pressed-steel shields rather than rubber contact seals. The shields retain factory grease and exclude coarse contaminants. They are not designed for easy re-lubrication in the field; for applications requiring periodic re-greasing, consider open or rubber-sealed (2RS) variants instead.
Yes, to a moderate degree. Deep groove ball bearings support primarily radial loads but can also accommodate light-to-moderate axial loads in both directions due to their deep raceway geometry. For applications where axial load is the dominant force, a dedicated thrust bearing or angular contact bearing would be more appropriate.
Yes. These bearings are manufactured to standard metric 6300-series dimensions and are dimensionally interchangeable with equivalent bearings from other manufacturers. Always verify the three key dimensions — bore (ID), outer diameter (OD), and width (T) — against your existing housing or shaft to confirm fit before installation.
Common uses include electric motor shaft support, conveyor and roller systems, 3D printer linear carriage assemblies, skateboard and inline skate wheel hubs, small gearbox rebuilds, pump impeller shafts, and general light-to-medium industrial machinery where a compact, sealed deep groove ball bearing is required.
Ordering 2, 3, 4, 5, or 10 pieces at once reduces per-unit cost and ensures you have matched spares on hand. Many applications — such as motors, conveyors, and wheel assemblies — use bearings in pairs or sets, so having extras prevents downtime when a replacement is needed urgently.
