NU2209 bearing: complete specifications & equivalents
The NU2209 is a ISO 15 radial bearing sized 45 x 85 x 23 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 45 mm |
| Outer diameter D | 85 mm |
| Width B | 23 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 85 kN |
| Basic static load rating C0 | 81.5 kN |
| Fatigue load limit Pu | 10.6 kN |
| Reference speed (thermal) | 9000 rpm |
| Limiting speed (mechanical) | 9500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 520 g |
| Manufacturer designation | NU 2209 ECP |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row 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. 6.1 single-row 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 & NU2200-series range
| Bore d | 1.772 in |
|---|---|
| Outer diameter D | 3.346 in |
| Width B | 0.906 in |
| ISO bore code | 09 |
| Radial section height (D−d)/2 | 20 mm |
| Smallest bore in NU2200-series | 17 mm |
| Largest outer diameter in NU2200-series | 1030 mm |
| Width range across NU2200-series | 16–272 mm |
| Bore position in NU2200-series (smallest first) | 7 of 39 |
| Bore above smallest NU2200-series size | 28 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NU2209-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 45×85×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| NJ2209-ECP | SKF | full Dimensions and internal design equivalent — standard interchange. | Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2209 ECP is a different execution with its own cage/flange configuration. |
| NUP2209-ECP | SKF | full Dimensions and internal design equivalent — standard interchange. | Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2209 ECP is a different execution with its own cage/flange configuration. |
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 NU2209 model number is decoded
For a 45 mm shaft carrying pure radial load, SKF lists NU2209 under catalogue execution NU 2209 ECP: one open single-row cylindrical roller bearing with polymer cage and separable inner ring. Reading the designation: the leading NU marks a single-row cylindrical roller bearing with separable inner ring, the 22 is the ISO 15 diameter/width series (wide), and the last two digits encode the 45 mm bore; the 85 mm OD and 23 mm width follow the ISO 15 general plan. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Catalogue mass 520 g for the 45×85×23 mm open execution covers the polymer cage and standard roller complement; steel or brass cage variants differ slightly in mass and carry their own order numbers. For a 45 mm shaft the usual inner-ring seat is k5 with an H7 housing when the inner ring rotates; the outer ring slides axially to accommodate thermal expansion of the shaft.
Typical equipment & failure modes
Common applications
- paper-machine wet-section rolls
- rolling-mill auxiliary gear trains
- crane hoist and trolley wheel shafts
- industrial gearbox input/output shafts
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
- 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
- hard-particle indentation of the raceway in unfiltered oil systems
Selection pitfalls — read before you substitute
- On this 45 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.
- The NU2200 series at 45 mm bore (85×23 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU200 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.
- The 520 g mass and 23 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU2209.
- Catalogue reference speed and limiting speed are different limits: the 9,000 r/min reference is a thermal criterion under load, while the 9,500 r/min limiting value is the mechanical ceiling — observe both.
- The 85/81.5 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.
- SKF lists several executions of NU2209 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2209 ECP designation when purchasing and match the execution to the speed and temperature requirements.
Frequently asked questions
What are the dimensions and catalogue data of NU2209?
The NU 2209 ECP is a single-row cylindrical roller bearing with 45 mm bore, 85 mm outer diameter and 23 mm width (1.772 × 3.346 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 85 kN, C0 81.5 kN, fatigue load limit Pu 10.6 kN, reference speed 9,000 r/min, limiting speed 9,500 r/min, mass about 520 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage.
How does the NU2209 bore code work?
The last two digits of NU2209 are bore code 09, so 09 × 5 = 45 mm bore. The 85 mm OD and 23 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code.
What does the ECP suffix mean on NU2209?
ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers.
Can NU2209 take axial load?
No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing.
How does NU2209 compare with a ball bearing of the same bore?
A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings on 2026-09-26. Read our editorial & correction policy.