6244-M bearing: complete specifications & equivalents
The 6244-M is a ISO 15 radial bearing sized 220 x 400 x 65 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 220 mm |
| Outer diameter D | 400 mm |
| Width B | 65 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 296 kN |
| Basic static load rating C0 | 365 kN |
| Fatigue load limit Pu | 8.8 kN |
| Reference speed (thermal) | 3200 rpm |
| Limiting speed (mechanical) | 3000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 36500 g |
| Manufacturer designation | 6244 M |
| 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 & 6200-series range
| Bore d | 8.661 in |
|---|---|
| Outer diameter D | 15.748 in |
| Width B | 2.559 in |
| ISO bore code | 44 |
| Radial section height (D−d)/2 | 90 mm |
| Smallest bore in 6200-series | 3 mm |
| Largest outer diameter in 6200-series | 540 mm |
| Width range across 6200-series | 2.5–85 mm |
| Bore position in 6200-series (smallest first) | 41 of 45 |
| Bore above smallest 6200-series size | 217 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6244 | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6244 (open arrangement) shares the 220×400×65 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 6244-M model number is decoded
In the 6200-series, the last two digits encode the bore: 6244 carries code 44 = 220 mm (code × 5). The envelope is 220×400×65 mm (8.661×15.748×2.559 in) with a 90.0 mm radial section height, C 296 kN, C0 365 kN and Pu 8.8 kN. The open 6244 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution, a separate order number from the pressed-steel version. Limiting speed 3000 r/min, catalogue mass 36500 g.
Typical equipment & failure modes
Common applications
- mill and kiln auxiliaries
- pulp and paper machinery
- marine deck machinery
- crusher auxiliary drives
Known failure patterns
- contamination wear when the open arrangement is used without external seals
- lubricant starvation where no regreasing interval is maintained
- raceway smearing under marginal lubrication at start-up
- electrical pitting in VFD-driven motors without shaft grounding
Selection pitfalls — read before you substitute
- Fillet radii must clear the 6244-M chamfer so the 65 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
- Do not preload 6244-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.
- The M suffix on 6244-M 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 36500 g quoted mass includes the heavier cage.
- Open 6244-M 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 6244-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- At 220 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.
Frequently asked questions
What are the dimensions of 6244-M?
The SKF 6244 M measures 220 mm bore × 400 mm OD × 65 mm width (8.661 × 15.748 × 2.559 in), mass about 36500 g. It is open, with no shields or seals.
How does the bore code in 6244 work?
The final two digits of 6244 are bore code 44, multiplied by 5 to give 220 mm.
What load can 6244-M take?
Catalogue values for 6244 M: dynamic C 296 kN, static C0 365 kN, fatigue limit Pu 8.8 kN. Use C in life calculation and C0 for static checks at 220 mm bore.
What is the speed rating of 6244-M?
SKF lists a 3200 r/min thermal reference speed and a 3000 r/min mechanical limiting speed for 6244 M; 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.