6044 bearing: complete specifications & equivalents
The 6044 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 / C3 available |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| 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) | 2400 rpm |
| Operating temperature | -40 to +150 °C |
| Mass | 16000 g |
| Manufacturer designation | SKF 6044 |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018) |
| Last verified | 2026-09-25 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-24
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 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
| 6044-NSK | NSK | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier. |
| 6044-ZZ | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 220×340×56 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty. |
| 6044-NTN | NTN | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier. |
| 6044-M | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF 6044 M (machined brass cage, open arrangement) is the same-size execution on the 220×340×56 mm envelope with ratings within 10 % — 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 model number is decoded
In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6044 carries bore code 44 = 220 mm. Outside diameter 340 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.
Typical equipment & failure modes
Common applications
- heavy conveyors
- pulp and paper machinery
- medium and heavy industrial drives
- large gearboxes
Known failure patterns
- contamination wear from dust and dirt ingress through the open arrangement
- lubricant starvation when no regreasing interval is maintained
- raceway smearing under marginal lubrication at start-up
- edge loading from shaft deflection or housing misalignment
Selection pitfalls — read before you substitute
- Large bores like the 220 mm of 6044 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.
- The 60xx extra-light section at 220 mm bore uses a smaller 340 mm OD than a 6244; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.
- Storage matters for open bearings: 6044 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.
- Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6044 units.
- Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.
- Vibration during standstill brinells the raceways of a 220 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.
- The open 6044 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6044-2Z (shields) and 6044-2RSH (contact seals), not suffix-free 6044.
- The 247/290 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives.
Frequently asked questions
What are the dimensions of a 6044 bearing?
A 6044 deep-groove ball bearing has a 220 mm bore, 340 mm outer diameter and 56 mm width (8.661 × 13.386 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields.
What does no suffix on 6044 mean?
A bare 6044 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication.
How does the 6000 compare with other series at the same 220 mm bore?
The second digit is the diameter series: 60 is the smallest standard section (340×56 mm, 60.0 mm radial section) at 220 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces.
Are 6044 bearings from different brands interchangeable?
For boundary dimensions, yes: every brand's 6044 uses the same ISO 15 envelope (220×340×56 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting.
What is the SKF designation and catalogue data for 6044?
In the SKF Rolling Bearings catalogue this size is listed as 6044 — the open (unsealed) execution, 220×340×56 mm per ISO 15. Quoted values: C 247 kN, C0 290 kN, Pu 7.35 kN, limiting speed 2400 r/min, mass 16000 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6044.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018) on 2026-09-25. Read our editorial & correction policy.