N322 bearing: complete specifications & equivalents
The N322 is a ISO 15 radial bearing sized 110 x 240 x 50 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 110 mm |
| Outer diameter D | 240 mm |
| Width B | 50 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 395 kN |
| Basic static load rating C0 | 400 kN |
| Fatigue load limit Pu | 41.5 kN |
| Limiting speed (mechanical) | 3000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 9770 g |
| Manufacturer designation | NTN N322 |
| 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 & N300-series range
| Bore d | 4.331 in |
|---|---|
| Outer diameter D | 9.449 in |
| Width B | 1.969 in |
| ISO bore code | 22 |
| Radial section height (D−d)/2 | 65 mm |
| Smallest bore in N300-series | 17 mm |
| Largest outer diameter in N300-series | 580 mm |
| Width range across N300-series | 14–108 mm |
| Bore position in N300-series (smallest first) | 20 of 33 |
| Bore above smallest N300-series size | 93 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| N322-ECP | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 110×240×50 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 N322 model number is decoded
N322 is the standard section of the NTN N300 dimension series for a 110 mm shaft — 395 kN of basic dynamic capacity in a 9770 g, open bearing. Digit by digit, N322 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 110 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 3,500 r/min with oil versus 3,000 r/min with grease (a 500 r/min band), lubrication choice for N322 is a thermal decision, not just a sealing one. Mass 9770 g for the 110×240×50 mm N322 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 110 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.
Typical equipment & failure modes
Common applications
- cement and mining conveyor drive pulleys
- heavy industrial gearbox and reducer shafts
- large pump, turbine and compressor rotors
- rolling-mill auxiliary drive shafts
Known failure patterns
- inner-ring raceway spalling from overload in the line-contact Hertzian zone
- pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant
- grease starvation and cage drag when relubrication intervals are extended past the grease life
- edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit
- false brinelling on standby machines exposed to external vibration
Selection pitfalls — read before you substitute
- Induction-heat the 110 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 240 mm raceway.
- The 65.0 mm section at 110 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 50 mm-wide cavity.
- Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 240 mm race brinells and releases as vibration within hours.
- Do not replace N322 with a deep-groove ball bearing on rating alone: line contact gives 395 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.
- Grease limiting speed 3,000 r/min and oil 3,500 r/min are different limits for N322: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.
- The 395/400 kN ratings, 41.5 kN Pu and 9770 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N322 (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 N322?
N322 is an NTN N single-row cylindrical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 50 mm width (4.331 × 9.449 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 395 kN, C0 400 kN, Pu 41.5 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 9770 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. N322 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. N322 is supplied in the standard open execution shown in the table.
Can N322 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 N322?
Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143 mm, Ew 207 mm. The nominal bore/OD remain 110/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 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.