6211-M bearing: complete specifications & equivalents
The 6211-M is a ISO 15 radial bearing sized 55 x 100 x 21 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 55 mm |
| Outer diameter D | 100 mm |
| Width B | 21 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 46.2 kN |
| Basic static load rating C0 | 29 kN |
| Fatigue load limit Pu | 1.25 kN |
| Reference speed (thermal) | 14000 rpm |
| Limiting speed (mechanical) | 13000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 720 g |
| Manufacturer designation | 6211 M |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018) |
| Last verified | 2026-09-27 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-27
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018)); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.
Dimensions in inches & 6200-series range
| Bore d | 2.165 in |
|---|---|
| Outer diameter D | 3.937 in |
| Width B | 0.827 in |
| ISO bore code | 11 |
| Radial section height (D−d)/2 | 22.5 mm |
| Smallest bore in 6200-series | 3 mm |
| Largest outer diameter in 6200-series | 540 mm |
| Width range across 6200-series | 2.5–85 mm |
| Bore position in 6200-series (smallest first) | 20 of 45 |
| Bore above smallest 6200-series size | 52 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6211-RSR | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6211VV on the same 55×100×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 211 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 55×100×21 mm envelope as SKF 211, but catalogue C/C0 differ (46.2/29 kN vs 48.4/44 kN) — envelope match only after a load check. |
| 211-ZZ | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 55×100×21 mm envelope as SKF 211-2Z, but catalogue C/C0 differ (46.2/29 kN vs 48.4/44 kN) — envelope match only after a load check. |
| 6211 | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6211 (open arrangement) shares the 55×100×21 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable. |
| 6211-ZZ | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6211-2Z (two non-contact shields) shares the 55×100×21 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable. |
| 6211-2RS | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6211-2RSH (two contact elastomer seals) shares the 55×100×21 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the 6211-M model number is decoded
In the 6200-series, the last two digits encode the bore: 6211 carries code 11 = 55 mm (code × 5). The envelope is 55×100×21 mm (2.165×3.937×0.827 in) with a 22.5 mm radial section height, C 46.2 kN, C0 29 kN and Pu 1.25 kN. The open 6211 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 13000 r/min, catalogue mass 720 g.
Typical equipment & failure modes
Common applications
- centrifugal and positive-displacement pumps
- material-handling equipment
- industrial fans
- compressor drives
Known failure patterns
- contamination wear when the open arrangement is used without external seals
- lubricant starvation where no regreasing interval is maintained
- edge loading from shaft deflection or housing misalignment
- rolling-contact fatigue spalling once the catalogue L10 life is exceeded
Selection pitfalls — read before you substitute
- Assign interference to the rotating ring: on a conventional shaft-mounted 55 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.
- The fatigue load limit is 1.25 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.
- The M suffix on 6211-M denotes a machined brass cage: it is the choice for high speeds, marginal lubrication and shock/vibration duty, and it is temperature-tolerant where polymer cages are not — the 720 g quoted mass includes the heavier cage.
- Open 6211-M needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.
- Plan a relubrication interval for 6211-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- Mount by heating the inner ring (max 120 °C) — driving 6211-M home through the outer ring or balls brinells the raceways.
Frequently asked questions
What are the dimensions of 6211-M?
The SKF 6211 M measures 55 mm bore × 100 mm OD × 21 mm width (2.165 × 3.937 × 0.827 in), mass about 720 g. It is open, with no shields or seals.
How does the bore code in 6211 work?
The final two digits of 6211 are bore code 11, multiplied by 5 to give 55 mm.
How heavy is 6211-M?
Catalogue mass is 720 g for 6211 M; seal and cage executions of the same envelope differ by a few grams.
What load can 6211-M take?
Catalogue values for 6211 M: dynamic C 46.2 kN, static C0 29 kN, fatigue limit Pu 1.25 kN. Use C in life calculation and C0 for static checks at 55 mm bore.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018) on 2026-09-27. Read our editorial & correction policy.