6056-M bearing: complete specifications & equivalents
The 6056-M is a ISO 15 radial bearing sized 280 x 420 x 65 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 280 mm |
| Outer diameter D | 420 mm |
| Width B | 65 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 302 kN |
| Basic static load rating C0 | 405 kN |
| Fatigue load limit Pu | 9.3 kN |
| Reference speed (thermal) | 3000 rpm |
| Limiting speed (mechanical) | 2600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 31000 g |
| Manufacturer designation | 6056 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 | 11.024 in |
|---|---|
| Outer diameter D | 16.535 in |
| Width B | 2.559 in |
| ISO bore code | 56 |
| Radial section height (D−d)/2 | 70 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) | 42 of 61 |
| Bore above smallest 6000-series size | 276 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6056 | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6056 (open arrangement) shares the 280×420×65 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 6056-M model number is decoded
In the 6000-series, the last two digits encode the bore: 6056 carries code 56 = 280 mm (code × 5). The envelope is 280×420×65 mm (11.024×16.535×2.559 in) with a 70.0 mm radial section height, C 302 kN, C0 405 kN and Pu 9.3 kN. The open 6056 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 2600 r/min, catalogue mass 31000 g.
Typical equipment & failure modes
Common applications
- pulp and paper machinery
- marine deck machinery
- crusher auxiliary drives
- large industrial gearboxes
Known failure patterns
- contamination wear when the open arrangement is used without external seals
- lubricant starvation where no regreasing interval is maintained
- cage damage from running beyond the limiting speed
- raceway smearing under marginal lubrication at start-up
Selection pitfalls — read before you substitute
- Clearance suffixes follow the seal code in the designation stack (e.g. 6056-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.
- Fillet radii must clear the 6056-M chamfer so the 65 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
- The M suffix on 6056-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 31000 g quoted mass includes the heavier cage.
- Open 6056-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 6056-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- Clearance suffixes follow the seal code in the designation stack (e.g. 6056-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.
Frequently asked questions
What are the dimensions of 6056-M?
The SKF 6056 M measures 280 mm bore × 420 mm OD × 65 mm width (11.024 × 16.535 × 2.559 in), mass about 31000 g. It is open, with no shields or seals.
How does the bore code in 6056 work?
The final two digits of 6056 are bore code 56, multiplied by 5 to give 280 mm.
How heavy is 6056-M?
Catalogue mass is 31000 g for 6056 M; seal and cage executions of the same envelope differ by a few grams.
What load can 6056-M take?
Catalogue values for 6056 M: dynamic C 302 kN, static C0 405 kN, fatigue limit Pu 9.3 kN. Use C in life calculation and C0 for static checks at 280 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.