NU2330 bearing: complete specifications & equivalents
The NU2330 is a ISO 15 radial bearing sized 150 x 320 x 108 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 150 mm |
| Outer diameter D | 320 mm |
| Width B | 108 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1130 kN |
| Basic static load rating C0 | 1400 kN |
| Fatigue load limit Pu | 132 kN |
| Limiting speed (mechanical) | 1900 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 39800 g |
| Manufacturer designation | NTN NU2330 |
| 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 & NU2300-series range
| Bore d | 5.906 in |
|---|---|
| Outer diameter D | 12.598 in |
| Width B | 4.252 in |
| ISO bore code | 30 |
| Radial section height (D−d)/2 | 85 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) | 22 of 35 |
| Bore above smallest NU2300-series size | 130 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NU2330-ECML | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 150×320×108 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 NU2330 model number is decoded
NU2330 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1130 kN dynamic rating in the 150 mm bore. Digit by digit, NU2330 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 150 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 193 mm and Ew 277 mm — the envelope inside the 150/320 mm bore/OD where the rollers actually run. Equivalent-load planning treats NU2330 as a pure radial bearing: keep P below 1130 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 150 mm shaft.
Typical equipment & failure modes
Common applications
- wind-turbine gearbox planet and rotor shafts
- ship propulsion line shafts and reduction gears
- mining SAG/ball-mill drive shafts
- offshore drawworks and winch drums
Known failure patterns
- roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load
- pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant
- micro-pitting when the EHL film falls below the composite roughness at high specific load
- edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit
- fretting corrosion on a loose rotating shaft seat
Selection pitfalls — read before you substitute
- At 150 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 39800 g NU2330 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
- The 108 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.
- The NU rib arrangement is not interchangeable with another prefix on the same 150 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 320×108 mm envelope matches.
- Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2330 skids at 1,900 r/min and fails by smearing long before L10 fatigue.
- The NU rib arrangement is not interchangeable with another prefix on the same 150 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 320×108 mm envelope matches.
- The 1130/1400 kN ratings, 132 kN Pu and 39800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2330 (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 NU2330?
NU2330 is an NTN NU single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 108 mm width (5.906 × 12.598 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1130 kN, C0 1400 kN, Pu 132 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 39800 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. NU2330 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. NU2330 is supplied in the standard open execution shown in the table.
Can NU2330 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 NU2330?
Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 277 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 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.