NUH2234-ECMH bearing: complete specifications & equivalents
The NUH2234-ECMH is a ISO 15 radial bearing sized 170 x 310 x 86 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 170 mm |
| Outer diameter D | 310 mm |
| Width B | 86 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 1600 kN |
| Basic static load rating C0 | 1530 kN |
| Fatigue load limit Pu | 156 kN |
| Reference speed (thermal) | 2200 rpm |
| Limiting speed (mechanical) | 2400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 28500 g |
| Manufacturer designation | SKF NUH 2234 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 & NUH2200-series range
| Bore d | 6.693 in |
|---|---|
| Outer diameter D | 12.205 in |
| Width B | 3.386 in |
| ISO bore code | 34 |
| Radial section height (D−d)/2 | 70 mm |
| Smallest bore in NUH2200-series | 100 mm |
| Largest outer diameter in NUH2200-series | 440 mm |
| Width range across NUH2200-series | 46–120 mm |
| Bore position in NUH2200-series (smallest first) | 8 of 13 |
| Bore above smallest NUH2200-series size | 70 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NCF2234-ECJB | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same ISO 15 envelope 170×310×86 mm, but catalogue C/C0 ratings differ between executions (1600/1530 vs 1160/1530 kN) and the NCF 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 NUH2234-ECMH model number is decoded
In SKF catalogue PUB BU/P1 17000, SKF NUH 2234 ECMH denotes a high-capacity cylindrical roller bearing on the ISO 15 170×310×86 mm envelope, dimension series 22 (light-section, wide), with catalogue mass 28500 g. Structurally, the NUH design has a high-capacity NJ-type execution whose displaced cage bars make room for additional rollers, with two integral flanges on the inner ring. In arrangement terms it 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). Speed planning for NUH2234-ECMH: the catalogue lists 2,200 r/min thermal reference speed and 2,400 r/min mechanical limiting speed. The mass entry 28500 g covers the complete catalogue execution. Mounting: 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. A 170 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
- 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
- polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant
- surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load
- cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded
- electrical pitting on VFD-driven shafts without grounding protection
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 2234 using the /PEX loads.
- Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.
- Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.
- The 1600/1530 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 NUH2234-ECMH?
SKF NUH 2234 ECMH is a high-capacity cylindrical roller bearing with 170 mm bore, 310 mm OD and 86 mm width per ISO 15. SKF lists C 1600 kN, C0 1530 kN, Pu 156 kN, reference speed 2,200 r/min and limiting speed 2,400 r/min, mass about 28500 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 NUH2234-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 NUH2234-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.