61996-MA bearing: complete specifications & equivalents
The 61996-MA is a ISO 15 radial bearing sized 480 x 650 x 78 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 480 mm |
| Outer diameter D | 650 mm |
| Width B | 78 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 449 kN |
| Basic static load rating C0 | 815 kN |
| Fatigue load limit Pu | 14.6 kN |
| Reference speed (thermal) | 1800 rpm |
| Limiting speed (mechanical) | 1500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 74000 g |
| Manufacturer designation | 61996 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 | 18.898 in |
|---|---|
| Outer diameter D | 25.591 in |
| Width B | 3.071 in |
| ISO bore code | 96 |
| Radial section height (D−d)/2 | 85 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) | 53 of 63 |
| Bore above smallest 61900-series size | 477 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 61996 | NTN | full Dimensions and internal design equivalent — standard interchange. | NTN counterpart NTN 6996 on the same 480×650×78 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 61996-MA model number is decoded
In the 61900-series, the last two digits encode the bore: 61996 carries code 96 = 480 mm (code × 5). The envelope is 480×650×78 mm (18.898×25.591×3.071 in) with a 85.0 mm radial section height, C 449 kN, C0 815 kN and Pu 14.6 kN. The open 61996 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 1500 r/min, catalogue mass 74000 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.
Typical equipment & failure modes
Common applications
- textile and packaging machinery
- slew and indexing drives
- large industrial gearboxes
- heavy conveyor drives
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
- Assign interference to the rotating ring: on a conventional shaft-mounted 480 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.
- At 480 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 61996-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 74000 g quoted mass includes the heavier cage.
- Open 61996-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 61996-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- Mount by heating the inner ring (max 120 °C) — driving 61996-MA home through the outer ring or balls brinells the raceways.
Frequently asked questions
What are the dimensions of 61996-MA?
The SKF 61996 MA measures 480 mm bore × 650 mm OD × 78 mm width (18.898 × 25.591 × 3.071 in), mass about 74000 g. It is open, with no shields or seals.
How does the bore code in 61996 work?
The final two digits of 61996 are bore code 96, multiplied by 5 to give 480 mm.
Which fits should I use for 61996-MA?
With a rotating inner ring use roughly m6 on the shaft and H7 in the 650 mm housing; reverse the interference if the outer ring rotates.
How heavy is 61996-MA?
Catalogue mass is 74000 g for 61996 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.