6044-M bearing: complete specifications & equivalents
The 6044-M is a ISO 15 radial bearing sized 220 x 340 x 56 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 | 340 mm |
| Width B | 56 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 247 kN |
| Basic static load rating C0 | 290 kN |
| Fatigue load limit Pu | 7.35 kN |
| Reference speed (thermal) | 4000 rpm |
| Limiting speed (mechanical) | 3200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 18500 g |
| Manufacturer designation | 6044 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 & 6000-series range
| Bore d | 8.661 in |
|---|---|
| Outer diameter D | 13.386 in |
| Width B | 2.205 in |
| ISO bore code | 44 |
| Radial section height (D−d)/2 | 60 mm |
| Smallest bore in 6000-series | 4 mm |
| Largest outer diameter in 6000-series | 1150 mm |
| Width range across 6000-series | 4–155 mm |
| Bore position in 6000-series (smallest first) | 39 of 61 |
| Bore above smallest 6000-series size | 216 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6044-ZZ | NSK | full Dimensions and internal design equivalent — standard interchange. | NSK counterpart NSK 6044ZZ on the same 220×340×56 mm envelope with ratings within 10 % — interchange after checking seal, cage and precision details on both pages. |
| 6044 | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF SKF 6044 (open arrangement) shares the 220×340×56 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 6044-M model number is decoded
In the 6000-series, the last two digits encode the bore: 6044 carries code 44 = 220 mm (code × 5). The envelope is 220×340×56 mm (8.661×13.386×2.205 in) with a 60.0 mm radial section height, C 247 kN, C0 290 kN and Pu 7.35 kN. The open 6044 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 3200 r/min, catalogue mass 18500 g.
Typical equipment & failure modes
Common applications
- marine deck machinery
- crusher auxiliary 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
- fretting corrosion on a creeping shaft or housing seat
- cage damage from running beyond the limiting speed
Selection pitfalls — read before you substitute
- Do not preload 6044-M to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.
- Fillet radii must clear the 6044-M chamfer so the 56 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
- The M suffix on 6044-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 18500 g quoted mass includes the heavier cage.
- Open 6044-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 6044-M; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- Do not preload 6044-M 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 6044-M?
The SKF 6044 M measures 220 mm bore × 340 mm OD × 56 mm width (8.661 × 13.386 × 2.205 in), mass about 18500 g. It is open, with no shields or seals.
How does the bore code in 6044 work?
The final two digits of 6044 are bore code 44, multiplied by 5 to give 220 mm.
What load can 6044-M take?
Catalogue values for 6044 M: dynamic C 247 kN, static C0 290 kN, fatigue limit Pu 7.35 kN. Use C in life calculation and C0 for static checks at 220 mm bore.
What is the speed rating of 6044-M?
SKF lists a 4000 r/min thermal reference speed and a 3200 r/min mechanical limiting speed for 6044 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.