N2324 bearing: complete specifications & equivalents
The N2324 is a ISO 15 radial bearing sized 120 x 260 x 86 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 120 mm |
| Outer diameter D | 260 mm |
| Width B | 86 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 785 kN |
| Basic static load rating C0 | 920 kN |
| Fatigue load limit Pu | 92.5 kN |
| Limiting speed (mechanical) | 2400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 21100 g |
| Manufacturer designation | NTN N2324 |
| 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 & N2300-series range
| Bore d | 4.724 in |
|---|---|
| Outer diameter D | 10.236 in |
| Width B | 3.386 in |
| ISO bore code | 24 |
| Radial section height (D−d)/2 | 70 mm |
| Smallest bore in N2300-series | 20 mm |
| Largest outer diameter in N2300-series | 580 mm |
| Width range across N2300-series | 21–175 mm |
| Bore position in N2300-series (smallest first) | 19 of 31 |
| Bore above smallest N2300-series size | 100 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| N2324 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data. |
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 N2324 model number is decoded
N2324 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 785 kN dynamic rating in the 120 mm bore. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 120 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N2324 designation when purchasing. Thermal planning around the 2,400 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,800 r/min for continuously high-duty 120 mm positions. Housing and shaft fillets must clear the ring chamfers of N2324; an oversized radius locks the ring on its face and tilts the 86 mm-wide seat.
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 distortion after a mounting blow carried through the roller set
- roller-end and raceway scoring from inadequate oil flow under heavy radial load
- brinelling from static overload or impact during handling
- fretting corrosion on a loose rotating shaft seat
Selection pitfalls — read before you substitute
- At 120 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the 21100 g N2324 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
- Grease limiting speed 2,400 r/min and oil 2,800 r/min are different limits for N2324: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.
- The 86 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 120 mm inner ring.
- Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2324 skids at 2,400 r/min and fails by smearing long before L10 fatigue.
- The 86 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 120 mm inner ring.
- The 785/920 kN ratings, 92.5 kN Pu and 21100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2324 (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 N2324?
N2324 is an NTN N single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 86 mm width (4.724 × 10.236 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 785 kN, C0 920 kN, Pu 92.5 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min, mass about 21100 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. N2324 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side.
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. N2324 is supplied in the standard open execution shown in the table.
Can N2324 take axial load and locate a shaft?
the N design is non-locating like NU but floats with the separable outer ring in the housing. 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 N2324?
Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm, Ew 226 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 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.