NUH2340-ECMH bearing: complete specifications & equivalents
The NUH2340-ECMH is a ISO 15 radial bearing sized 200 x 420 x 138 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 200 mm |
| Outer diameter D | 420 mm |
| Width B | 138 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 2200 kN |
| Basic static load rating C0 | 3200 kN |
| Fatigue load limit Pu | 300 kN |
| Reference speed (thermal) | 1400 rpm |
| Limiting speed (mechanical) | 1900 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 92500 g |
| Manufacturer designation | SKF NUH 2340 ECMH |
| 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 & NUH2300-series range
| Bore d | 7.874 in |
|---|---|
| Outer diameter D | 16.535 in |
| Width B | 5.433 in |
| ISO bore code | 40 |
| Radial section height (D−d)/2 | 110 mm |
| Smallest bore in NUH2300-series | 100 mm |
| Largest outer diameter in NUH2300-series | 500 mm |
| Width range across NUH2300-series | 73–155 mm |
| Bore position in NUH2300-series (smallest first) | 11 of 13 |
| Bore above smallest NUH2300-series size | 100 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NCF2340-ECJB | SKF | full Dimensions and internal design equivalent — standard interchange. | Same ISO 15 envelope 200×420×138 mm and equivalent catalogue ratings; the NCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical. |
| NCF2340-ECJB-PEX | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same ISO 15 envelope 200×420×138 mm, but catalogue C/C0 ratings differ between executions (2200/3200 vs 2550/3200 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent. |
| NUH2340-ECMH-PEX | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same ISO 15 envelope 200×420×138 mm, but catalogue C/C0 ratings differ between executions (2200/3200 vs 2550/3200 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 NUH2340-ECMH model number is decoded
NUH2340-ECMH is the 200 mm bore entry in the NUH2300 range: a 200×420×138 mm high-capacity cylindrical roller bearing with a one-piece machined brass cage, rated C 2200 kN / C0 3200 kN. The NUH configuration means a high-capacity NJ-type execution whose displaced cage bars make room for additional rollers, with two integral flanges on the inner ring; functionally the bearing is the locating partner in paired cross-locating arrangements for heavily loaded shafts, locating axially in one direction. Reading the order-string suffix ECMH: the high-capacity execution with a machined brass cage (the /PEX variant is the pinion-shaft special build). With C 2200 kN and C0 3200 kN, size the bearing on the 200×420 mm ISO 15 envelope and check the 300 kN Pu against the equivalent-load floor; the catalogue lists 1,400 r/min thermal reference speed and 1,900 r/min mechanical limiting speed. Fit practice for NUH2340-ECMH: typically paired with the matching NCF ECJB non-locating bearing on the same shaft; observe the catalogue shoulder and fillet data for the large inner ring. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment. 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
- offshore and marine heavy drive trains
- large mining mill pinion shafts
- multi-megawatt wind turbine main gearboxes
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
- cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up
- 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
- brinelling from static overload or impact during handling and mounting
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 NUH 2340 using the /PEX loads.
- Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.
- Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.
- The 2200/3200 kN ratings are SKF catalogue 17000 (2018) values for the ECMH 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 NUH2340-ECMH?
SKF NUH 2340 ECMH is a high-capacity cylindrical roller bearing with 200 mm bore, 420 mm OD and 138 mm width per ISO 15. SKF lists C 2200 kN, C0 3200 kN, Pu 300 kN, reference speed 1,400 r/min and limiting speed 1,900 r/min, mass about 92500 g.
What does the NUH designation and ECMH suffix mean?
The ECMH suffix denotes the high-capacity execution with a machined brass cage; the /PEX variant is the pinion-shaft special build. Structurally this execution has a high-capacity NJ-type execution whose displaced cage bars make room for additional rollers, with two integral flanges on the inner ring.
Can NUH2340-ECMH take axial load and locate the shaft?
In one direction, as the locating member of a high-capacity pair; the matching NCF ECJB bearing floats. It is not a general-purpose axial bearing.
How does NUH2340-ECMH 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.