61984-MA bearing: complete specifications & equivalents
The 61984-MA is a ISO 15 radial bearing sized 420 x 560 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 | 420 mm |
| Outer diameter D | 560 mm |
| Width B | 65 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 351 kN |
| Basic static load rating C0 | 600 kN |
| Fatigue load limit Pu | 11.4 kN |
| Reference speed (thermal) | 2200 rpm |
| Limiting speed (mechanical) | 1800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 43000 g |
| Manufacturer designation | 61984 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 | 16.535 in |
|---|---|
| Outer diameter D | 22.047 in |
| Width B | 2.559 in |
| ISO bore code | 84 |
| Radial section height (D−d)/2 | 70 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) | 50 of 63 |
| Bore above smallest 61900-series size | 417 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 61984 | NTN | full Dimensions and internal design equivalent — standard interchange. | NTN counterpart NTN 6984 on the same 420×560×65 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 61984-MA model number is decoded
In the 61900-series, the last two digits encode the bore: 61984 carries code 84 = 420 mm (code × 5). The envelope is 420×560×65 mm (16.535×22.047×2.559 in) with a 70.0 mm radial section height, C 351 kN, C0 600 kN and Pu 11.4 kN. The open 61984 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 1800 r/min, catalogue mass 43000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.
Typical equipment & failure modes
Common applications
- industrial fans and blowers
- mill and kiln auxiliaries
- pulp and paper machinery
- marine deck 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
- Fillet radii must clear the 61984-MA chamfer so the 65 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
- At 420 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.
- The MA suffix on 61984-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 43000 g quoted mass includes the heavier cage.
- Open 61984-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 61984-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 420 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 61984-MA?
The SKF 61984 MA measures 420 mm bore × 560 mm OD × 65 mm width (16.535 × 22.047 × 2.559 in), mass about 43000 g. It is open, with no shields or seals.
How does the bore code in 61984 work?
The final two digits of 61984 are bore code 84, multiplied by 5 to give 420 mm.
Which fits should I use for 61984-MA?
With a rotating inner ring use roughly m6 on the shaft and H7 in the 560 mm housing; reverse the interference if the outer ring rotates.
How heavy is 61984-MA?
Catalogue mass is 43000 g for 61984 MA; seal and cage executions of the same envelope differ by a few grams.
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.