6040-M bearing: complete specifications & equivalents
The 6040-M is a ISO 15 radial bearing sized 200 x 310 x 51 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 200 mm |
| Outer diameter D | 310 mm |
| Width B | 51 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 216 kN |
| Basic static load rating C0 | 245 kN |
| Fatigue load limit Pu | 6.4 kN |
| Reference speed (thermal) | 4300 rpm |
| Limiting speed (mechanical) | 3600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 14000 g |
| Manufacturer designation | 6040 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 | 7.874 in |
|---|---|
| Outer diameter D | 12.205 in |
| Width B | 2.008 in |
| ISO bore code | 40 |
| Radial section height (D−d)/2 | 55 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) | 38 of 61 |
| Bore above smallest 6000-series size | 196 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6040-ZZ | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6040ZZ on the same 200×310×51 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6040 | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6040 on the same 200×310×51 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
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 6040-M model number is decoded
In the 6000-series, the last two digits encode the bore: 6040 carries code 40 = 200 mm (code × 5). The envelope is 200×310×51 mm (7.874×12.205×2.008 in) with a 55.0 mm radial section height, C 216 kN, C0 245 kN and Pu 6.4 kN. The open 6040 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 3600 r/min, catalogue mass 14000 g.
Typical equipment & failure modes
Common applications
- hoists and winches
- industrial fans and blowers
- mill and kiln auxiliaries
- pulp and paper machinery
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
- Mount by heating the inner ring (max 120 °C) — driving 6040-M home through the outer ring or balls brinells the raceways.
- Fillet radii must clear the 6040-M chamfer so the 51 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
- The M suffix on 6040-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 14000 g quoted mass includes the heavier cage.
- Open 6040-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 6040-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- The fatigue load limit is 6.4 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.
Frequently asked questions
What are the dimensions of 6040-M?
The SKF 6040 M measures 200 mm bore × 310 mm OD × 51 mm width (7.874 × 12.205 × 2.008 in), mass about 14000 g. It is open, with no shields or seals.
How does the bore code in 6040 work?
The final two digits of 6040 are bore code 40, multiplied by 5 to give 200 mm.
How heavy is 6040-M?
Catalogue mass is 14000 g for 6040 M; seal and cage executions of the same envelope differ by a few grams.
What load can 6040-M take?
Catalogue values for 6040 M: dynamic C 216 kN, static C0 245 kN, fatigue limit Pu 6.4 kN. Use C in life calculation and C0 for static checks at 200 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.