The main difference is size: a standard 6205ZZ bearing measures 25 × 52 × 15 mm, while a standard 6215-2RZ measures 75 × 130 × 25 mm (bore × outside diameter × width). Their suffixes also describe different closures: “ZZ” commonly indicates metal shields on both sides, while “2RZ” commonly indicates two low-friction, non-contact seals. These bearings are not interchangeable; the shaft, housing, load, and operating conditions must match the selected bearing. Because closure suffixes can vary by manufacturer, confirm the supplier’s drawing and designation before ordering.
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Both products belong to the single-row deep groove ball bearing family, but they serve different size and load requirements. The 6205ZZ is a much smaller bearing with metal shields, whereas the 6215-2RZ has a substantially larger envelope and non-contact seals in common naming conventions. In practical terms, first check whether the bearing fits the shaft and housing; then compare closure, load ratings, speed limits, lubrication, and operating environment.
| Feature | 6205ZZ | 6215-2RZ |
|---|---|---|
| Bearing type | Single-row deep groove ball bearing | Single-row deep groove ball bearing |
| Bore diameter | 25 mm | 75 mm |
| Outside diameter | 52 mm | 130 mm |
| Width | 15 mm | 25 mm |
| Closure indicated by common suffix usage | Metal shields on both sides | Two low-friction, non-contact seals |
| Interchangeability | Not interchangeable; dimensions differ substantially | |
In the standard 6205 designation, “62” identifies a deep groove ball bearing series, and “05” corresponds to a 25 mm bore in the standard bore-code system. The commonly used boundary dimensions are 25 mm bore, 52 mm outside diameter, and 15 mm width. The “ZZ” suffix often means that a metal shield is fitted on each side, helping limit the entry of larger contaminants while retaining lubricant.
A shield is not the same as a contact seal. Because shields generally do not rub against the inner ring, they can be suitable where low sealing friction is important, but they do not provide the same level of contact protection that a rubbing seal may offer against fine contaminants or liquid ingress. The actual protection and speed limits depend on the bearing design and manufacturer specifications. For an application exposed to dirt, washdown, or moisture, do not choose ZZ solely on the basis of the suffix.
The standard 6215 size is 75 mm bore, 130 mm outside diameter, and 25 mm width. In common bearing nomenclature, “2RZ” denotes low-friction, non-contact seals on both sides. Those seals are intended to help retain lubricant and restrict contamination while avoiding the continuous rubbing contact associated with some seal designs.
Suffix definitions are not completely universal across bearing brands. A manufacturer may use a different code or design detail for a similar closure, so “2RZ” should be checked against the specific supplier’s catalog or technical drawing. Confirm seal material, seal geometry, internal clearance, lubrication, and any speed limitation rather than assuming that all products with the same suffix perform identically.
The dimensional difference is the first and decisive selection point. A 6205ZZ has a 25 mm bore and fits a very different shaft and housing arrangement from a 6215-2RZ with a 75 mm bore. Even if both bearings are deep groove designs, one cannot replace the other without redesigning the surrounding components.
The larger 6215 bearing will generally be selected for a larger bearing position and may support higher loads than a smaller bearing of the same general type, but the precise load capacity must be verified from the manufacturer’s rating data. Do not infer a dynamic or static load rating from the model number alone. For replacement purchasing, compare the original bearing’s load rating, internal clearance, tolerance class, and operating speed as well as its basic dimensions.
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The closure choice should reflect the environment and maintenance plan. Metal shields on a 6205ZZ can be appropriate in relatively clean conditions where low friction and a compact assembly are priorities. A 6215-2RZ’s non-contact seals may offer a different balance of lubricant retention and contamination control, but they should not be treated as equivalent to contact seals or as a guarantee against liquid ingress.
Both bearings may be supplied with factory grease, but grease type, fill quantity, and replenishment options vary by product. Seals and shields can also affect allowable speed and operating temperature, so use the selected manufacturer’s limits rather than applying a generic value. If the application runs at high speed, experiences frequent temperature changes, or is exposed to water or abrasive particles, request the relevant technical data before finalizing the specification.
If the original part number is unclear, identify the shaft diameter, housing bore, bearing width, closure type, and any markings on the old bearing. Also check whether the original unit has a non-standard clearance, cage, or tolerance class. These details can prevent a dimensionally correct but operationally unsuitable replacement.
For B2B procurement, ask suppliers to confirm the full designation and dimensional drawing rather than quoting only “6205” or “6215.” Request manufacturer-specific information for basic dynamic and static load ratings, reference speed, limiting speed, internal clearance, and lubricant. If the bearing will be used in an automotive-related assembly, confirm fit and operating requirements against the equipment or engineering specification; an automotive application alone does not identify the correct bearing variant.
Also compare sourcing details that affect project planning: available quantity, packaging, lead time, and any inspection or documentation requirements. Make sure the quotation specifies whether the product is open, shielded, or sealed and identifies the maker or agreed quality requirements. These checks help reduce the risk of receiving a bearing with the right base number but the wrong closure or configuration.
6205ZZ and 6215-2RZ differ in both size and closure. The 6205ZZ is commonly 25 × 52 × 15 mm with two metal shields, while the 6215-2RZ is commonly 75 × 130 × 25 mm with two low-friction, non-contact seals. They are not substitutes for one another, and the exact meaning of closure suffixes should be verified against the selected manufacturer’s documentation.
Start by matching the required bore, outside diameter, and width, then check load, speed, clearance, lubrication, and environmental protection. If you are sourcing either configuration, Tuoda Bearing can help review the required designation and application details so you can request a suitable product specification and quotation. Share the existing bearing number or drawing, operating conditions, and purchase quantity to support an accurate inquiry.
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