6244 bearing: complete specifications & equivalents
The 6244 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 / C3 available |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| 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) | 2000 rpm |
| Operating temperature | -40 to +150 °C |
| Mass | 33500 g |
| Manufacturer designation | SKF 6244 |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018) |
| Last verified | 2026-09-24 |
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 & 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 | 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. |
| 6244-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 220×400×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 6244-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 220×400×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 6244-M | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF 6244 M (machined brass cage, open arrangement) is the same-size execution on the 220×400×65 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 6244 model number is decoded
6244 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 44 by five gives the 220 mm bore; the 400 mm outside diameter and 65 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 220 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. 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
- edge loading from shaft deflection or housing misalignment
- rolling-contact fatigue spalling after the rated L10 life is exceeded
Selection pitfalls — read before you substitute
- At 220 mm bore the ring mass is significant: heat 6244 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.
- The 62xx light series is the default general-purpose section at 220 mm bore; before upgrading to a 6344 for extra capacity, confirm the housing accepts a 400 mm OD and 65 mm width — it is not a drop-in swap.
- The open 6244 has no lubricant retention: grease escapes and contaminants migrate straight into the 220×400×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.
- Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6244 units.
- Never mix components between two 6244 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.
- Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.
- The open 6244 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 6244-2Z (shields) and 6244-2RSH (contact seals), not suffix-free 6244.
- The 296/365 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 6244 bearing?
A 6244 deep-groove ball bearing has a 220 mm bore, 400 mm outer diameter and 65 mm width (8.661 × 15.748 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields.
How does the 6244 bore code work?
The last two digits of 6244 are bore code 44, giving 44 × 5 = 220 mm bore. The 400 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone.
What does no suffix on 6244 mean?
A bare 6244 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 6200 compare with other series at the same 220 mm bore?
The '2' is the light diameter series: 400×65 mm with a 90.0 mm radial section at 220 mm bore. A 6344 on the same bore is larger and higher-rated; a 6044 is smaller and lower-rated.
What is the SKF designation and catalogue data for 6244?
In the SKF Rolling Bearings catalogue this size is listed as 6244 — the open (unsealed) execution, 220×400×65 mm per ISO 15. Quoted values: C 296 kN, C0 365 kN, Pu 8.8 kN, limiting speed 2000 r/min, mass 33500 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6244.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018) on 2026-09-24. Read our editorial & correction policy.