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When a worn or undersized bearing causes wobble, noise, or premature failure in your machinery, finding the exact replacement fast is critical. Engineers, machinists, hobbyists, and maintenance technicians rely on deep groove ball bearings as the go-to solution for radial and moderate axial loads across rotating assemblies of all sizes.
These deep groove ball bearings are manufactured from chrome steel (GCr15 equivalent) with a precision-ground raceway. Two shield configurations are available: ZZ (metal double-shield, grease-lubricated, low drag) and RS (rubber contact seal, enhanced dust and moisture exclusion). Sizes span from miniature MR-series (ID 2 mm / 0.08 in) through standard 6000/6200/6300-series up to 6320ZZ (ID 100 mm / 3.94 in, OD 215 mm / 8.46 in), with thickness ranging from 2.5 mm to 47 mm.
Typical use cases include 3D printer and CNC axis bearings (608ZZ, MR105ZZ), electric motor and pump shaft support (6205ZZ–6210ZZ), skateboard and inline-skate wheel bearings (608ZZ), RC car and drone drivetrain bearings (MR series), and industrial conveyor or gearbox rebuilds (6300–6320 series). Whether you need a deep groove ball bearing replacement for power tools or a miniature bearing for precision instruments, select your exact size above.
| Bearing Series | 6000, 6200, 6300, MR (miniature), 603–609 |
|---|---|
| Shield Type | ZZ (metal double-shield) / RS (rubber contact seal) |
| Material | Chrome steel (GCr15 equivalent), steel cage |
| Inner Diameter (ID) | 2 mm – 120 mm (0.08 in – 4.72 in) — See variant options |
| Outer Diameter (OD) | 5 mm – 215 mm (0.20 in – 8.46 in) — See variant options |
| Width / Thickness | 2.5 mm – 47 mm — See variant options |
| Lubrication | Pre-greased (lithium-based grease) |
| Operating Temperature | Typically –20 °C to +120 °C (–4 °F to +248 °F) |
| Dimensional Standard | ISO 15 / ABEC equivalent |
| Radial Clearance | C3 (standard) — See variant options |
| Weight | See variant options |
ZZ bearings use stamped metal shields that retain grease and block larger particles while generating slightly less drag — ideal for dry, clean, or lightly dusty environments such as electric motors and power tools. RS bearings use rubber contact seals that form a tighter barrier against fine dust, moisture, and light chemical exposure, making them the better choice for outdoor equipment, food-adjacent machinery, or any application where contamination ingress is a concern. If in doubt, RS provides more protection at a small friction cost.
Measure or look up three dimensions on your existing bearing or shaft housing: Inner Diameter (ID / bore), Outer Diameter (OD), and Width (thickness). These are stamped on most bearings in the format ID×OD×Width (e.g., 608ZZ = 8×22×7 mm). Match all three values to the variant options in this listing. If the bearing number is visible (e.g., 6205, MR126ZZ), you can search that code directly in the size selector above.
Deep groove ball bearings are designed primarily for radial loads but can also handle moderate axial (thrust) loads in both directions. Dynamic and static load ratings vary by size — smaller MR-series bearings are suited for light-duty precision applications (3D printers, RC vehicles), while larger 6300-series bearings handle heavier industrial radial loads in motors, pumps, and gearboxes. For exact load ratings, refer to the bearing designation and consult standard bearing load tables for the corresponding series.
These bearings are made from chrome steel, which offers good hardness and fatigue resistance but is not inherently stainless. For applications involving water, humidity, or mild chemicals, the RS rubber seal provides additional protection by limiting moisture ingress. For highly corrosive or submerged environments, stainless steel bearings (not this listing) would be more appropriate. Applying a light coat of compatible grease to the outer race before installation can also extend service life in moderately humid conditions.
Yes — all sizes in this listing conform to ISO 15 boundary dimensions, which are the same international standard used by major bearing manufacturers (SKF, NSK, FAG, NTN, etc.). As long as the ID, OD, and width match your existing bearing, these are dimensionally interchangeable drop-in replacements. Always verify the three dimensions before ordering to ensure a correct fit.
All three are deep groove ball bearing series sharing the same bore (ID) for a given number suffix, but they differ in outer diameter and width: the 6000 series is the lightest and narrowest (smallest OD for a given bore), the 6200 series is medium, and the 6300 series has the largest OD and widest cross-section — providing higher load capacity at the cost of more space. For example, a 6205, 6305, and 6005 all have a 25 mm bore but different ODs and widths. Choose based on the available housing space and the load requirements of your application.
The bearings are pre-packed with lithium-based grease suitable for general-purpose use across a typical operating temperature range of –20 °C to +120 °C. ZZ metal-shielded bearings can be carefully de-shielded, cleaned, and re-greased if needed. RS rubber-sealed bearings are generally considered sealed-for-life in light-duty applications, though the seal can be removed for re-lubrication in maintenance-intensive settings. Use a compatible NLGI #2 lithium or lithium-complex grease for re-lubrication.
