61860-MA bearing: complete specifications & equivalents
The 61860-MA is a ISO 15 radial bearing sized 300 x 380 x 38 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 300 mm |
| Outer diameter D | 380 mm |
| Width B | 38 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 172 kN |
| Basic static load rating C0 | 245 kN |
| Fatigue load limit Pu | 5.6 kN |
| Reference speed (thermal) | 3200 rpm |
| Limiting speed (mechanical) | 2600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 10500 g |
| Manufacturer designation | 61860 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 | 11.811 in |
|---|---|
| Outer diameter D | 14.961 in |
| Width B | 1.496 in |
| ISO bore code | 60 |
| Radial section height (D−d)/2 | 40 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) | 47 of 74 |
| Bore above smallest 61800-series size | 299 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 61860 | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 61860 (open arrangement) shares the 300×380×38 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 61860-MA model number is decoded
In the 61800-series, the last two digits encode the bore: 61860 carries code 60 = 300 mm (code × 5). The envelope is 300×380×38 mm (11.811×14.961×1.496 in) with a 40.0 mm radial section height, C 172 kN, C0 245 kN and Pu 5.6 kN. The open 61860 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 2600 r/min, catalogue mass 10500 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
- The fatigue load limit is 5.6 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.
- Mount by heating the inner ring (max 120 °C) — driving 61860-MA home through the outer ring or balls brinells the raceways.
- The MA suffix on 61860-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 10500 g quoted mass includes the heavier cage.
- Open 61860-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 61860-MA; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- Fillet radii must clear the 61860-MA chamfer so the 38 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
Frequently asked questions
What are the dimensions of 61860-MA?
The SKF 61860 MA measures 300 mm bore × 380 mm OD × 38 mm width (11.811 × 14.961 × 1.496 in), mass about 10500 g. It is open, with no shields or seals.
How does the bore code in 61860 work?
The final two digits of 61860 are bore code 60, multiplied by 5 to give 300 mm.
What load can 61860-MA take?
Catalogue values for 61860 MA: dynamic C 172 kN, static C0 245 kN, fatigue limit Pu 5.6 kN. Use C in life calculation and C0 for static checks at 300 mm bore.
What is the speed rating of 61860-MA?
SKF lists a 3200 r/min thermal reference speed and a 2600 r/min mechanical limiting speed for 61860 MA; real limits also depend on lubrication and fits.
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.