61992-MA bearing: complete specifications & equivalents
The 61992-MA is a ISO 15 radial bearing sized 460 x 620 x 74 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 460 mm |
| Outer diameter D | 620 mm |
| Width B | 74 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 423 kN |
| Basic static load rating C0 | 750 kN |
| Fatigue load limit Pu | 13.7 kN |
| Reference speed (thermal) | 1900 rpm |
| Limiting speed (mechanical) | 1600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 62500 g |
| Manufacturer designation | 61992 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 | 18.11 in |
|---|---|
| Outer diameter D | 24.409 in |
| Width B | 2.913 in |
| ISO bore code | 92 |
| Radial section height (D−d)/2 | 80 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) | 52 of 63 |
| Bore above smallest 61900-series size | 457 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 61992 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | NTN bearing NTN 6992 on the same 460×620×74 mm envelope, but catalogue C/C0 differ (423/750 kN vs 415/645 kN) — envelope interchange only after a load check. |
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 61992-MA model number is decoded
In the 61900-series, the last two digits encode the bore: 61992 carries code 92 = 460 mm (code × 5). The envelope is 460×620×74 mm (18.11×24.409×2.913 in) with a 80.0 mm radial section height, C 423 kN, C0 750 kN and Pu 13.7 kN. The open 61992 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 1600 r/min, catalogue mass 62500 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.
Typical equipment & failure modes
Common applications
- robotics and automation joints
- lay shafts and idler shafts
- textile and packaging machinery
- slew and indexing drives
Known failure patterns
- contamination wear when the open arrangement is used without external seals
- lubricant starvation where no regreasing interval is maintained
- fretting corrosion on a creeping shaft or housing seat
- cage damage from running beyond the limiting speed
Selection pitfalls — read before you substitute
- Deep-groove geometry tolerates only minutes of misalignment; if the 620 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 61992-MA.
- The fatigue load limit is 13.7 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.
- The MA suffix on 61992-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 62500 g quoted mass includes the heavier cage.
- Open 61992-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 61992-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- Do not preload 61992-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.
Frequently asked questions
What are the dimensions of 61992-MA?
The SKF 61992 MA measures 460 mm bore × 620 mm OD × 74 mm width (18.11 × 24.409 × 2.913 in), mass about 62500 g. It is open, with no shields or seals.
How does the bore code in 61992 work?
The final two digits of 61992 are bore code 92, multiplied by 5 to give 460 mm.
What is the speed rating of 61992-MA?
SKF lists a 1900 r/min thermal reference speed and a 1600 r/min mechanical limiting speed for 61992 MA; real limits also depend on lubrication and fits.
What is the difference between 61992-MA and a same-bore 62-series bearing?
Section height differs: 61992-MA has a 80 mm radial section and C 423 kN; always match d, D and B — same bore alone never makes two bearings interchangeable.
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.