61830-MA (brass cage) bearing: complete specifications & equivalents
The 61830-MA is a ISO 15 radial bearing sized 150 x 190 x 20 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 150 mm |
| Outer diameter D | 190 mm |
| Width B | 20 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 48.8 kN |
| Basic static load rating C0 | 61 kN |
| Fatigue load limit Pu | 1.96 kN |
| Reference speed (thermal) | 6700 rpm |
| Limiting speed (mechanical) | 4300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1350 g |
| Manufacturer designation | 61830 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 & 61800-series range
| Bore d | 5.906 in |
|---|---|
| Outer diameter D | 7.48 in |
| Width B | 0.787 in |
| ISO bore code | 30 |
| Radial section height (D−d)/2 | 20 mm |
| Smallest bore in 61800-series | 1 mm |
| Largest outer diameter in 61800-series | 1820 mm |
| Width range across 61800-series | 1–140 mm |
| Bore position in 61800-series (smallest first) | 37 of 74 |
| Bore above smallest 61800-series size | 149 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 61830-FAG | FAG | partial Main dimensions match; tolerances, seals or internal clearance differ. | FAG bearing FAG 61830 on the same 150×190×20 mm envelope, but catalogue C/C0 differ (48.8/61 kN vs 54/60 kN) — envelope interchange only after a load check. |
| 61830-2RS | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6830DDU on the same 150×190×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 61830-RSR | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6830VV on the same 150×190×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 61830-ZZ | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6830ZZ on the same 150×190×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 61830-NSK | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6830 on the same 150×190×20 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 61830-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | NTN bearing 6830 on the same 150×190×20 mm envelope, but catalogue C/C0 differ (48.8/61 kN vs 53/55 kN) — envelope interchange only after a load check. |
| 61830-2RS-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | NTN bearing 6830LLU on the same 150×190×20 mm envelope, but catalogue C/C0 differ (48.8/61 kN vs 53/55 kN) — envelope interchange only after a load check. |
| 61830-ZZ-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | NTN bearing 6830ZZ on the same 150×190×20 mm envelope, but catalogue C/C0 differ (48.8/61 kN vs 53/55 kN) — envelope interchange only after a load check. |
| 61830 | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 61830 (open arrangement) shares the 150×190×20 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 61830-MA model number is decoded
In the 61800-series, the last two digits encode the bore: 61830 carries code 30 = 150 mm (code × 5). The envelope is 150×190×20 mm (5.906×7.48×0.787 in) with a 20.0 mm radial section height, C 48.8 kN, C0 61 kN and Pu 1.96 kN. The open 61830 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 4300 r/min, catalogue mass 1350 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.
Typical equipment & failure modes
Common applications
- slew and indexing drives
- large industrial gearboxes
- heavy conveyor drives
- hoists and winches
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
- Deep-groove geometry tolerates only minutes of misalignment; if the 190 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 61830-MA.
- The fatigue load limit is 1.96 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.
- The MA suffix on 61830-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 1350 g quoted mass includes the heavier cage.
- Open 61830-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 61830-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 150 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.
- Sealed SKF units are filled with a lithium-based grease for general service; food-grade, low-temperature and high-temperature fills are order options and are not field-interchangeable once the unit is sealed.
- Where two 61830 bearings share one shaft in a preloaded or matched arrangement, order both from the same production lot; catalogue figures describe a single bearing, not a matched set.
Frequently asked questions
What are the dimensions of 61830-MA?
The SKF 61830 MA measures 150 mm bore × 190 mm OD × 20 mm width (5.906 × 7.48 × 0.787 in), mass about 1350 g. It is open, with no shields or seals.
How does the bore code in 61830 work?
The final two digits of 61830 are bore code 30, multiplied by 5 to give 150 mm.
What is the difference between 61830-MA and a same-bore 62-series bearing?
Section height differs: 61830-MA has a 20 mm radial section and C 48.8 kN; always match d, D and B — same bore alone never makes two bearings interchangeable.
Which fits should I use for 61830-MA?
With a rotating inner ring use roughly m6 on the shaft and H7 in the 190 mm housing; reverse the interference if the outer ring rotates.
How heavy is 61830-MA?
Catalogue mass is 1350 g for 61830 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.