32326UTG bearing: complete specifications & equivalents
The 32326UTG is a ISO 355 radial bearing sized 130 x 280 x 98.75 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 | 280 mm |
| Width B | 98.75 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1140 kN |
| Basic static load rating C0 | 1240 kN |
| Fatigue load limit Pu | 122 kN |
| Limiting speed (mechanical) | 1400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 27400 g |
| Manufacturer designation | NTN 32326UTG |
| 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 | 5.118 in |
|---|---|
| Outer diameter D | 11.024 in |
| Width B | 3.888 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 75 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) | 22 of 30 |
| Bore above smallest 32300-series size | 110 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32326UTG | 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 32326UTG model number is decoded
32326UTG is a metric single-row tapered roller bearing in the NTN 4T programme: a pressed-steel cage guides profiled rollers between a separable cone and cup on the 130×280 mm ISO 355 envelope, with 98.75 mm overall assembled width T. NTN also quotes this bearing with its ISO 355 dimension-series abbreviation which is the maker-neutral cross-reference for the 130×280 mm envelope; 4T is NTN's own tapered-roller brand mark on the parts. At 1140 kN C the bearing offers about 8.8 kN of dynamic capacity per millimetre of the 130 mm bore — compare any substitution on this ratio and the 98.75 mm assembled T, not on bore alone. The 8.8 kN-per-mm-bore capacity figure for 32326UTG summarises the 1140 kN rating over 130 mm bore; use it to sanity-check an interchange candidate before swapping brands. Re-adjustment after bedding-in is standard practice: re-check end play once the paired 32326UTG arrangement has run in, because initial seat seating relaxes the set preload slightly.
Typical equipment & failure modes
Common applications
- large crusher and SAG/AG-mill drive shafts
- wind-turbine gearbox and main-shaft arrangements
- offshore crane and drawworks drums
- heavy haul railway traction gearboxes
Known failure patterns
- cup creep and housing fretting when the specified outer-ring press fit is not achieved
- rib scoring when axial load is carried beyond the cone rib capacity of the adjusted pair
- preload loss from racewear when one bearing of the paired set is replaced without re-adjusting end play
- cage fatigue when the pair is run continuously near the grease limiting speed without oil cooling
- fretting corrosion on a loose cone seat that creeps under rotating load
Selection pitfalls — read before you substitute
- At 130 mm bore the 32326UTG 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 1140 kN C level.
- The extra-heavy 32300 family at 130 mm bore (280×98.75 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.
- Back-to-back and face-to-face arrangements react differently to shaft bending: pick the pair orientation for the moment load before locking the 130 mm shoulder geometry, because retrofitting flips the cups.
- The U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering 32326UTG by size alone can deliver the wrong contact-angle execution for a pinion position.
- Open 32326UTG units have no seals: a wheel-hub or gearbox application needs external sealing or the 1,400 r/min grease figure is meaningless once water reaches the cone rib.
- The 1140/1240 kN ratings and 122 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32326UTG; 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 32326UTG?
32326UTG is a metric 4T tapered roller bearing to ISO 355: 130 mm bore, 280 mm outside diameter and 98.75 mm assembled width T (5.118 × 11.024 × 3.888 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1140 kN, C0 1240 kN, Pu 122 kN, grease limiting speed 1,400 r/min, oil speed 2,000 r/min, mass about 27400 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32326UTG?
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 (32326UTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32326UTG designation encode the 130 mm bore?
last two digits 26 are the ISO bore code, ×5 = 130 mm (codes 00–03 use the 10/12/15/17 exception table). The 280 mm OD and 98.75 mm assembled T follow the ISO 355 dimension-series plan.
Why does 32326UTG list two speeds, 1,400 and 2,000 r/min?
The lower figure, 1,400 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32326UTG 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 32326UTG mean?
Suffix reading on 32326UTG: the UTG suffix marks the ULTAGE specification for large NTN tapered rollers — upgraded material and internal design for longer life inside the unchanged ISO 355 envelope; 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.