61936-MA bearing: complete specifications & equivalents
The 61936-MA is a ISO 15 radial bearing sized 180 x 250 x 33 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 180 mm |
| Outer diameter D | 250 mm |
| Width B | 33 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 119 kN |
| Basic static load rating C0 | 134 kN |
| Fatigue load limit Pu | 3.9 kN |
| Reference speed (thermal) | 5300 rpm |
| Limiting speed (mechanical) | 4300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 5000 g |
| Manufacturer designation | 61936 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 | 7.087 in |
|---|---|
| Outer diameter D | 9.843 in |
| Width B | 1.299 in |
| ISO bore code | 36 |
| Radial section height (D−d)/2 | 35 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) | 37 of 63 |
| Bore above smallest 61900-series size | 177 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 61936-ZZ | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 180×250×33 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty. |
| 61936 | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 61936 (open arrangement) shares the 180×250×33 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 61936-MA model number is decoded
In the 61900-series, the last two digits encode the bore: 61936 carries code 36 = 180 mm (code × 5). The envelope is 180×250×33 mm (7.087×9.843×1.299 in) with a 35.0 mm radial section height, C 119 kN, C0 134 kN and Pu 3.9 kN. The open 61936 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 5000 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
- brinelling from static overload or hammer blows during mounting
- false brinelling from vibration while the shaft stands idle
Selection pitfalls — read before you substitute
- Do not preload 61936-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.
- Do not preload 61936-MA to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.
- The MA suffix on 61936-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 5000 g quoted mass includes the heavier cage.
- Open 61936-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 61936-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- Fillet radii must clear the 61936-MA chamfer so the 33 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
Frequently asked questions
What are the dimensions of 61936-MA?
The SKF 61936 MA measures 180 mm bore × 250 mm OD × 33 mm width (7.087 × 9.843 × 1.299 in), mass about 5000 g. It is open, with no shields or seals.
How does the bore code in 61936 work?
The final two digits of 61936 are bore code 36, multiplied by 5 to give 180 mm.
What is the difference between 61936-MA and a same-bore 62-series bearing?
Section height differs: 61936-MA has a 35 mm radial section and C 119 kN; always match d, D and B — same bore alone never makes two bearings interchangeable.
Which fits should I use for 61936-MA?
With a rotating inner ring use roughly m6 on the shaft and H7 in the 250 mm housing; reverse the interference if the outer ring rotates.
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.