NCF2344-ECJB bearing: complete specifications & equivalents
The NCF2344-ECJB is a ISO 15 radial bearing sized 220 x 460 x 145 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 | 460 mm |
| Width B | 145 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 2510 kN |
| Basic static load rating C0 | 3650 kN |
| Fatigue load limit Pu | 335 kN |
| Reference speed (thermal) | 1300 rpm |
| Limiting speed (mechanical) | 2000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 116000 g |
| Manufacturer designation | SKF NCF 2344 ECJB |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings) · extracted 2026-09-26
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings); 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 & NCF2300-series range
| Bore d | 8.661 in |
|---|---|
| Outer diameter D | 18.11 in |
| Width B | 5.709 in |
| ISO bore code | 44 |
| Radial section height (D−d)/2 | 120 mm |
| Smallest bore in NCF2300-series | 130 mm |
| Largest outer diameter in NCF2300-series | 460 mm |
| Width range across NCF2300-series | 93–145 mm |
| Bore position in NCF2300-series (smallest first) | 9 of 9 |
| Bore above smallest NCF2300-series size | 90 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NUH2344-ECMH | SKF | full Dimensions and internal design equivalent — standard interchange. | Same ISO 15 envelope 220×460×145 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical. |
| NUH2344-ECMH-PEX | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same ISO 15 envelope 220×460×145 mm, but catalogue C/C0 ratings differ between executions (2510/3650 vs 2900/3650 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent. |
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 NCF2344-ECJB model number is decoded
For a 220 mm shaft, SKF lists NCF2344-ECJB as high-capacity cylindrical roller: 460 mm OD, 145 mm wide, Pu 335 kN, the catalogue lists 1,300 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. Reading the NCF prefix: the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. This makes the execution the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Speed planning for NCF2344-ECJB: the catalogue lists 1,300 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. The mass entry 116000 g covers the complete catalogue execution. Mounting: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. A 220 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.
Typical equipment & failure modes
Common applications
- large mining mill pinion shafts
- multi-megawatt wind turbine main gearboxes
- offshore and marine heavy drive trains
Known failure patterns
- inner-ring raceway spalling from overload or contamination in the line-contact hertz zone
- outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating
- micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment
- polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant
- roller-end scoring from inadequate oil flow in the roller-raceway contact
- cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded
- hard-particle indentation of the raceway in unfiltered oil systems
Selection pitfalls — read before you substitute
- High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.
- The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2344 using the /PEX loads.
- Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 145 mm-wide ring and concentrates load.
- Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 460 mm raceway.
- The 2510/3650 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification.
Frequently asked questions
What are the dimensions and catalogue data of NCF2344-ECJB?
SKF NCF 2344 ECJB is a high-capacity cylindrical roller bearing with 220 mm bore, 460 mm OD and 145 mm width per ISO 15. SKF lists C 2510 kN, C0 3650 kN, Pu 335 kN, reference speed 1,300 r/min and limiting speed 2,000 r/min, mass about 116000 g.
What does the NCF designation and ECJB suffix mean?
The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope.
Can NCF2344-ECJB take axial load and locate the shaft?
The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially.
How does NCF2344-ECJB compare with the other executions in the same envelope?
The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number.
What limits the service life of this bearing most often?
Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings on 2026-09-26. Read our editorial & correction policy.