6011-M (brass cage) bearing: complete specifications & equivalents
The 6011-M is a ISO 15 radial bearing sized 55 x 90 x 18 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 | 90 mm |
| Width B | 18 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 29.6 kN |
| Basic static load rating C0 | 21.2 kN |
| Fatigue load limit Pu | 0.9 kN |
| Reference speed (thermal) | 16000 rpm |
| Limiting speed (mechanical) | 14000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 440 g |
| Manufacturer designation | 6011 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 & 6000-series range
| Bore d | 2.165 in |
|---|---|
| Outer diameter D | 3.543 in |
| Width B | 0.709 in |
| ISO bore code | 11 |
| Radial section height (D−d)/2 | 17.5 mm |
| Smallest bore in 6000-series | 4 mm |
| Largest outer diameter in 6000-series | 1150 mm |
| Width range across 6000-series | 4–155 mm |
| Bore position in 6000-series (smallest first) | 18 of 61 |
| Bore above smallest 6000-series size | 51 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6011-FAG | FAG | full Dimensions and internal design equivalent — standard interchange. | FAG counterpart FAG 6011 on the same 55×90×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6011-2RS-FAG | FAG | full Dimensions and internal design equivalent — standard interchange. | FAG counterpart FAG 6011-2RSR on the same 55×90×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6011-ZZ-FAG | FAG | full Dimensions and internal design equivalent — standard interchange. | FAG counterpart FAG 6011-2Z on the same 55×90×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6011-2RS-NSK | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6011DDU on the same 55×90×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6011-RSR | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6011VV on the same 55×90×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6011-ZZ-NSK | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6011ZZ on the same 55×90×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6011-NSK | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6011 on the same 55×90×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6011-NTN | NTN | full Dimensions and internal design equivalent — standard interchange. | NTN counterpart 6011 on the same 55×90×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6011-2RS-NTN | NTN | full Dimensions and internal design equivalent — standard interchange. | NTN counterpart 6011LLU on the same 55×90×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6011-RSR-NTN | NTN | full Dimensions and internal design equivalent — standard interchange. | NTN counterpart 6011LLB on the same 55×90×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6011-ZZ-NTN | NTN | full Dimensions and internal design equivalent — standard interchange. | NTN counterpart 6011ZZ on the same 55×90×18 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6011 | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6011 (open arrangement) shares the 55×90×18 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable. |
| 6011-ZZ | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6011-2Z (two non-contact shields) shares the 55×90×18 mm envelope with ratings within 10 % — execution variant of the same size; boundary dimensions interchangeable. |
| 6011-2RS | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6011-2RS1 (two contact elastomer seals) shares the 55×90×18 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 6011-M model number is decoded
In the 6000-series, the last two digits encode the bore: 6011 carries code 11 = 55 mm (code × 5). The envelope is 55×90×18 mm (2.165×3.543×0.709 in) with a 17.5 mm radial section height, C 29.6 kN, C0 21.2 kN and Pu 0.9 kN. The open 6011 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 14000 r/min, catalogue mass 440 g.
Typical equipment & failure modes
Common applications
- industrial fans
- compressor drives
- machine tool auxiliaries
- agricultural gearboxes
Known failure patterns
- contamination wear when the open arrangement is used without external seals
- lubricant starvation where no regreasing interval is maintained
- raceway smearing under marginal lubrication at start-up
- electrical pitting in VFD-driven motors without shaft grounding
Selection pitfalls — read before you substitute
- Deep-groove geometry tolerates only minutes of misalignment; if the 90 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 6011-M.
- Fillet radii must clear the 6011-M chamfer so the 18 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
- The M suffix on 6011-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 440 g quoted mass includes the heavier cage.
- Open 6011-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 6011-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 6011-M home through the outer ring or balls brinells the raceways.
- A replacement 6011 should go onto inspected seats only: SKF mounting guidance calls for clean, burr-free journals within tolerance, since a large share of early failures traces back to damaged or worn seats.
- SKF date-codes its packaging, and greased sealed or shielded bearings carry a finite shelf life: rotate stock first-in-first-out and store boxes dry, cool and away from vibration.
Frequently asked questions
What are the dimensions of 6011-M?
The SKF 6011 M measures 55 mm bore × 90 mm OD × 18 mm width (2.165 × 3.543 × 0.709 in), mass about 440 g. It is open, with no shields or seals.
How does the bore code in 6011 work?
The final two digits of 6011 are bore code 11, multiplied by 5 to give 55 mm.
How long can a greased 6011-M be stored?
Sealed and shielded SKF units carry a finite grease shelf life: SKF recommends first-in-first-out stock rotation and dry, cool, vibration-free storage. Open units ship with rust preventive only and are greased at assembly.
What load can 6011-M take?
Catalogue values for 6011 M: dynamic C 29.6 kN, static C0 21.2 kN, fatigue limit Pu 0.9 kN. Use C in life calculation and C0 for static checks at 55 mm bore.
What is the speed rating of 6011-M?
SKF lists a 16000 r/min thermal reference speed and a 14000 r/min mechanical limiting speed for 6011 M; real limits also depend on lubrication and fits.
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.