NU2260 bearing: complete specifications & equivalents
The NU2260 is a ISO 15 radial bearing sized 300 x 540 x 140 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 300 mm |
| Outer diameter D | 540 mm |
| Width B | 140 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 2420 kN |
| Basic static load rating C0 | 3650 kN |
| Fatigue load limit Pu | 290 kN |
| Limiting speed (mechanical) | 1000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 135000 g |
| Manufacturer designation | NTN NU2260 |
| Standard | ISO 15 |
| Catalog version | NTN Ball and Roller Bearings CAT.No.2203E |
| Last verified | 2026-10-01 |
Source: catalog reference (NTN Ball and Roller Bearings CAT.No.2203E) · extracted 2026-10-01
Parameters extracted from the official NTN Ball and Roller Bearings catalogue (NTN Ball and Roller Bearings CAT.No.2203E); NTN® is a trademark of NTN Corporation, used here for identification only — mpnbase is not an authorized NTN distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at ntnglobal.com.
Dimensions in inches & NU2200-series range
| Bore d | 11.811 in |
|---|---|
| Outer diameter D | 21.26 in |
| Width B | 5.512 in |
| ISO bore code | 60 |
| Radial section height (D−d)/2 | 120 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) | 33 of 39 |
| Bore above smallest NU2200-series size | 283 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NU2260-MA | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 300×540×140 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
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 NU2260 model number is decoded
NU2260 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 2420 kN dynamic rating in the 300 mm bore. Numbering ties NU2260 to its envelope: type code NU, series NU2200, 300 mm bore; the 540×140 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 120.0 mm radial section ((540−300)/2) frames the roller complement; capacity per millimetre of bore is about 8.1 kN/mm before application factors. Speed ratio check: limiting 1,000 r/min is .83 of the 1,200 r/min oil value for NU2260; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 300 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.
Typical equipment & failure modes
Common applications
- heavy press and large gearbox main shafts
- rolling-mill work-roll and backup-roll positions
- large turbine and generator rotor bearings
- wind-turbine gearbox planet and rotor shafts
Known failure patterns
- roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load
- cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance
- roller-end and raceway scoring from inadequate oil flow under heavy radial load
- fretting corrosion on a loose rotating shaft seat
- brinelling from static overload or impact during handling
Selection pitfalls — read before you substitute
- At 300 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 135000 g NU2260 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
- If the shaft must be located both ways, do not use NU2260 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.
- Do not replace NU2260 with a deep-groove ball bearing on rating alone: line contact gives 2420 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.
- Open NU2260 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 300 mm contact.
- The 120.0 mm section at 300 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 140 mm-wide cavity.
- The 2420/3650 kN ratings, 290 kN Pu and 135000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2260 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives.
Frequently asked questions
What are the dimensions and catalogue data of NU2260?
NU2260 is an NTN NU single-row cylindrical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 140 mm width (11.811 × 21.26 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2420 kN, C0 3650 kN, Pu 290 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 135000 g. It is open, with a pressed sheet-steel cage.
What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?
The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2260 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially.
What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?
EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2260 is supplied in the standard open execution shown in the table.
Can NU2260 take axial load and locate a shaft?
the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set).
What do Fw and Ew mean for NU2260?
Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 364 mm, Ew 476 mm. The nominal bore/OD remain 300/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil.
Reviewed & verified by the MPN Base engineering desk against source catalog NTN Ball and Roller Bearings CAT.No.2203E on 2026-10-01. Read our editorial & correction policy.