32322U bearing: complete specifications & equivalents
The 32322U is a ISO 355 radial bearing sized 110 x 240 x 84.5 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 | 84.5 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 | 970 kN |
| Fatigue load limit Pu | 99.5 kN |
| Limiting speed (mechanical) | 1600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 17600 g |
| Manufacturer designation | NTN 32322U |
| Standard | ISO 355 |
| 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 & 32300-series range
| Bore d | 4.331 in |
|---|---|
| Outer diameter D | 9.449 in |
| Width B | 3.327 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 65 mm |
| Smallest bore in 32300-series | 20 mm |
| Largest outer diameter in 32300-series | 460 mm |
| Width range across 32300-series | 22.25–154 mm |
| Bore position in 32300-series (smallest first) | 20 of 30 |
| Bore above smallest 32300-series size | 90 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32322U | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
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 32322U model number is decoded
For a 110 mm shaft with a thrust component, NTN lists 32322U, a metric 4T tapered roller bearing of 785 kN C and 970 kN C0 inside the 240 mm OD, 84.5 mm-wide assembled set. On the NTN nameplate the parts carry 4T plus the bare code, while 2203E orders 32322U by the metric ISO 355 number (ISO series abbreviation 2GD): 110 mm bore, 240 mm OD. 2203E lists two speed ceilings for 32322U: 1,600 r/min with grease lubrication (the limiting speed) and 2,200 r/min with oil, the higher oil value reflecting better heat removal from the cone rib. Selection: C 785 kN against C0 970 kN gives a C0/C ratio of 1.24 for the 110 mm bore, and the equivalent combined load must keep below the rating at the target L10 with the pair counted as one unit. Open 4T bearings need application seals; without them the grease at the cone rib of 32322U washes out and the rib/roller-end contact smears on the first wet or dusty shift.
Typical equipment & failure modes
Common applications
- large conveyor and bucket-elevator pulleys
- mineral-processing feeder and crusher auxiliaries
- marine winch and deck-machinery shafts
- paper-machine press-section rolls
Known failure patterns
- cone-raceway spalling at the large rib when preload is set too high for the lubricant film
- flaking on one cone only when a back-to-back / face-to-face pair is loaded unevenly by a bent shaft
- smearing on the roller large ends and cone rib after a dry start with preload but no oil film
- cage damage from a mounting blow delivered through the roller complement instead of the ring face
- brinell marks on cone and cup raceways from impact during handling or hammering during fitting
Selection pitfalls — read before you substitute
- Mount the 110 mm cone by induction heating (max 120 °C) and the cup with a press sleeve; the 17600 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
- The extra-heavy 32300 family at 110 mm bore (240×84.5 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 2,200 r/min oil ceiling.
- Open 32322U units have no seals: a wheel-hub or gearbox application needs external sealing or the 1,600 r/min grease figure is meaningless once water reaches the cone rib.
- On slash-size and T-code bearings confirm the full code on both cone and cup before fitting: the 110 mm bore alone does not identify the cup, and a mismatched cone/cup set has no catalogue rating.
- Grease packs must leave free volume in the 84.5 mm-wide set; over-greasing a paired bearing churning at the 2,200 r/min oil-band speed raises temperature and destroys the preload setting.
- The 785/970 kN ratings and 99.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32322U (ISO 355 2GD); internal geometry legitimately differs between manufacturers, so re-verify ratings, adjustment and suffix before substituting another make on a rated drive.
Frequently asked questions
What are the dimensions and catalogue ratings of NTN 32322U?
32322U is a metric 4T tapered roller bearing to ISO 355: 110 mm bore, 240 mm outside diameter and 84.5 mm assembled width T (4.331 × 9.449 × 3.327 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 785 kN, C0 970 kN, Pu 99.5 kN, grease limiting speed 1,600 r/min, oil speed 2,200 r/min, mass about 17600 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32322U?
4T is NTN's tapered roller bearing brand mark, stamped on the cone and cup in the factory. It identifies the NTN 4T programme and is not a dimension, so the catalogue and this page list the bare ISO 355 number (32322U); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32322U designation encode the 110 mm bore and what is 2GD?
last two digits 22 are the ISO bore code, ×5 = 110 mm (codes 00–03 use the 10/12/15/17 exception table). The 240 mm OD and 84.5 mm assembled T follow the ISO 355 dimension-series plan. 2GD is the maker-neutral ISO 355 abbreviation for this dimension series (the same code other manufacturers print); 4T is NTN's own brand mark.
Why does 32322U list two speeds, 1,600 and 2,200 r/min?
The lower figure, 1,600 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32322U at 2,200 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32322U mean?
Suffix reading on 32322U: U marks the reinforced/uprated internal design of the bare number, a separate order number with higher load capacity than the basic execution; the suffix is part of the order number and the variants are not interchangeable articles.
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.