32226U bearing: complete specifications & equivalents
The 32226U is a ISO 355 radial bearing sized 130 x 230 x 67.75 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 130 mm |
| Outer diameter D | 230 mm |
| Width B | 67.75 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 585 kN |
| Basic static load rating C0 | 815 kN |
| Fatigue load limit Pu | 83.5 kN |
| Limiting speed (mechanical) | 1500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 11300 g |
| Manufacturer designation | NTN 32226U |
| 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 & 32200-series range
| Bore d | 5.118 in |
|---|---|
| Outer diameter D | 9.055 in |
| Width B | 2.667 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 50 mm |
| Smallest bore in 32200-series | 17 mm |
| Largest outer diameter in 32200-series | 580 mm |
| Width range across 32200-series | 17.25–159 mm |
| Bore position in 32200-series (smallest first) | 23 of 36 |
| Bore above smallest 32200-series size | 113 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32226U | 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 32226U model number is decoded
For a 130 mm shaft with a thrust component, NTN lists 32226U, a metric 4T tapered roller bearing of 585 kN C and 815 kN C0 inside the 230 mm OD, 67.75 mm-wide assembled set. On the NTN nameplate the parts carry 4T plus the bare code, while 2203E orders 32226U by the metric ISO 355 number (ISO series abbreviation 4FD): 130 mm bore, 230 mm OD. NTN grades 4T metric bearings as open bearings without integral seals; at 130 mm bore the application supplies the seals and the grease fill or oil supply to the 4FD ISO 355 assembly. The fatigue load limit Pu printed for 32226U is 83.5 kN; in the adjusted-life equation that is the equivalent-load floor below which high reliability is expected even under contamination. Mount the 130 mm-bore cone on the shaft first (induction heat, max 120 °C), fit the cup square in its housing, then set preload or end play; never drive the cup home through the rollers of 32226U.
Typical equipment & failure modes
Common applications
- rolling-mill roll-neck and gearbox positions
- large crusher and SAG/AG-mill drive shafts
- wind-turbine gearbox and main-shaft arrangements
- offshore crane and drawworks drums
Known failure patterns
- cup creep and housing fretting when the specified outer-ring press fit is not achieved
- 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
- indentation of the raceways by hard particles in unsealed open arrangements
Selection pitfalls — read before you substitute
- At 130 mm bore the 32226U set is adjusted with hydraulic nuts on large mill and wind positions; follow the drive-up angle/end-play procedure, because manual torque methods cannot control preload at the 585 kN C level.
- The heavy-section 32200 family at 130 mm bore (230×67.75 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 2,000 r/min oil ceiling.
- Never fit the 130 mm cone by hammering the 230 mm cup: force for both press fits goes through the ring faces only, or brinell marks release as noise within the first running hours.
- Grease packs must leave free volume in the 67.75 mm-wide set; over-greasing a paired bearing churning at the 2,000 r/min oil-band speed raises temperature and destroys the preload setting.
- The 50.0 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 32226U or the ring will bottom out on the radius instead of the shoulder face.
- The 585/815 kN ratings and 83.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32226U (ISO 355 4FD); 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 32226U?
32226U is a metric 4T tapered roller bearing to ISO 355: 130 mm bore, 230 mm outside diameter and 67.75 mm assembled width T (5.118 × 9.055 × 2.667 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 585 kN, C0 815 kN, Pu 83.5 kN, grease limiting speed 1,500 r/min, oil speed 2,000 r/min, mass about 11300 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32226U?
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 (32226U); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32226U designation encode the 130 mm bore and what is 4FD?
last two digits 26 are the ISO bore code, ×5 = 130 mm (codes 00–03 use the 10/12/15/17 exception table). The 230 mm OD and 67.75 mm assembled T follow the ISO 355 dimension-series plan. 4FD 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 32226U list two speeds, 1,500 and 2,000 r/min?
The lower figure, 1,500 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32226U at 2,000 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32226U mean?
Suffix reading on 32226U: 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.