NU2312 bearing: complete specifications & equivalents
The NU2312 is a ISO 15 radial bearing sized 60 x 130 x 46 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 60 mm |
| Outer diameter D | 130 mm |
| Width B | 46 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 260 kN |
| Basic static load rating C0 | 265 kN |
| Fatigue load limit Pu | 34.5 kN |
| Reference speed (thermal) | 5600 rpm |
| Limiting speed (mechanical) | 6700 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2750 g |
| Manufacturer designation | NU 2312 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 & NU2300-series range
| Bore d | 2.362 in |
|---|---|
| Outer diameter D | 5.118 in |
| Width B | 1.811 in |
| ISO bore code | 12 |
| Radial section height (D−d)/2 | 35 mm |
| Smallest bore in NU2300-series | 20 mm |
| Largest outer diameter in NU2300-series | 750 mm |
| Width range across NU2300-series | 21–224 mm |
| Bore position in NU2300-series (smallest first) | 9 of 35 |
| Bore above smallest NU2300-series size | 40 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NU2312-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 60×130×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| NJ2312-ECP | SKF | full Dimensions and internal design equivalent — standard interchange. | Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2312 ECP is a different execution with its own cage/flange configuration. |
| NUP2312-ECP | SKF | full Dimensions and internal design equivalent — standard interchange. | Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2312 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 NU2312 model number is decoded
In SKF catalogue PUB BU/P1 17000, NU2312 appears as NU 2312 ECP: an open, single-row cylindrical roller bearing in the NU2300 series, with glass-fibre reinforced polyamide cage and line-contact geometry for high radial capacity. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 23 (the wide), and bore code 12 = 60 mm; dimensions 60×130×46 mm therefore match the ISO 15 envelope. 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 2750 g for the 60×130×46 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. Fit selection follows the rotating ring — interference on a rotating inner ring — and the outer ring is free to slide axially in the housing; a 60 mm shaft typically takes a k5 seat with an H6 housing bore.
Typical equipment & failure modes
Common applications
- cement-kiln support-roller shafts
- wind-turbine gearbox intermediate shafts
- marine propulsion gearbox shafts
- heavy industrial gearbox 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
- 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
- edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)
Selection pitfalls — read before you substitute
- Mount the 60 mm bore NU2312 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.
- The NU2300 series at 60 mm bore (130×46 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU300 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.
- Shaft and housing fillets must clear the bearing chamfer so the 46 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.
- The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.
- The 260/265 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 NU2312 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2312 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 NU2312?
The NU 2312 ECP is a single-row cylindrical roller bearing with 60 mm bore, 130 mm outer diameter and 46 mm width (2.362 × 5.118 × 1.811 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 260 kN, C0 265 kN, fatigue load limit Pu 34.5 kN, reference speed 5,600 r/min, limiting speed 6,700 r/min, mass about 2750 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage.
How does the NU2312 bore code work?
The last two digits of NU2312 are bore code 12, so 12 × 5 = 60 mm bore. The 130 mm OD and 46 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 NU2312?
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 NU2312 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 NU2312 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.