61940-MA bearing: complete specifications & equivalents
The 61940-MA is a ISO 15 radial bearing sized 200 x 280 x 38 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 | 280 mm |
| Width B | 38 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 148 kN |
| Basic static load rating C0 | 166 kN |
| Fatigue load limit Pu | 4.55 kN |
| Reference speed (thermal) | 4800 rpm |
| Limiting speed (mechanical) | 3800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 7300 g |
| Manufacturer designation | 61940 MA |
| 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 & 61900-series range
| Bore d | 7.874 in |
|---|---|
| Outer diameter D | 11.024 in |
| Width B | 1.496 in |
| ISO bore code | 40 |
| Radial section height (D−d)/2 | 40 mm |
| Smallest bore in 61900-series | 3 mm |
| Largest outer diameter in 61900-series | 1120 mm |
| Width range across 61900-series | 3–118 mm |
| Bore position in 61900-series (smallest first) | 39 of 63 |
| Bore above smallest 61900-series size | 197 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 61940-ZZ | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 200×280×38 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty. |
| 61940 | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 61940 (open arrangement) shares the 200×280×38 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 61940-MA model number is decoded
In the 61900-series, the last two digits encode the bore: 61940 carries code 40 = 200 mm (code × 5). The envelope is 200×280×38 mm (7.874×11.024×1.496 in) with a 40.0 mm radial section height, C 148 kN, C0 166 kN and Pu 4.55 kN. The open 61940 MA carries no shields or seals and relies on application lubrication and external sealing. The MA suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 3800 r/min, catalogue mass 7300 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.
Typical equipment & failure modes
Common applications
- clutch and transmission assemblies
- robotics and automation joints
- lay shafts and idler shafts
- textile and packaging machinery
Known failure patterns
- contamination wear when the open arrangement is used without external seals
- lubricant starvation where no regreasing interval is maintained
- electrical pitting in VFD-driven motors without shaft grounding
- edge loading from shaft deflection or housing misalignment
Selection pitfalls — read before you substitute
- The fatigue load limit is 4.55 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.
- Deep-groove geometry tolerates only minutes of misalignment; if the 280 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 61940-MA.
- The MA suffix on 61940-MA 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 7300 g quoted mass includes the heavier cage.
- Open 61940-MA 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 61940-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- Assign interference to the rotating ring: on a conventional shaft-mounted 200 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.
Frequently asked questions
What are the dimensions of 61940-MA?
The SKF 61940 MA measures 200 mm bore × 280 mm OD × 38 mm width (7.874 × 11.024 × 1.496 in), mass about 7300 g. It is open, with no shields or seals.
How does the bore code in 61940 work?
The final two digits of 61940 are bore code 40, multiplied by 5 to give 200 mm.
How heavy is 61940-MA?
Catalogue mass is 7300 g for 61940 MA; seal and cage executions of the same envelope differ by a few grams.
What load can 61940-MA take?
Catalogue values for 61940 MA: dynamic C 148 kN, static C0 166 kN, fatigue limit Pu 4.55 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.