32236UUTG bearing: complete specifications & equivalents
The 32236UUTG is a ISO 355 radial bearing sized 180 x 320 x 91 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 180 mm |
| Outer diameter D | 320 mm |
| Width B | 91 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1320 kN |
| Basic static load rating C0 | 1690 kN |
| Fatigue load limit Pu | 157 kN |
| Limiting speed (mechanical) | 1100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 30400 g |
| Manufacturer designation | NTN 32236UUTG |
| 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 | 7.087 in |
|---|---|
| Outer diameter D | 12.598 in |
| Width B | 3.583 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 70 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) | 28 of 36 |
| Bore above smallest 32200-series size | 163 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32236UUTG | 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 32236UUTG model number is decoded
32236UUTG is the NTN 4T catalogue entry for a 180×320×91 mm metric tapered roller bearing — separable cone and cup, designed for combined radial and axial load as an individually adjusted bearing. The last two digits 36 are the ISO bore code, ×5 = 180 mm (codes 00–03 use the 10/12/15/17 exception table) under the ISO 355 numbering; the 91 mm value printed here is T, the width of the fully assembled cone-plus-cup set, not the inner-ring width alone. Individually mounted, 32236UUTG takes axial force in one direction only; two bearings are arranged face-to-face (X) or back-to-back (O) according to the moment stiffness and misalignment the shaft requires. The two speed columns differ by a factor of .73 (grease/limiting 1,100 vs oil 1,500 r/min); heat generation at the cone rib decides which lubrication a real 32236UUTG arrangement can sustain. With a rotating shaft a m6/n6 shaft seat and a press-fit cup are typical catalogue practice for 32236UUTG; reverse the logic if the cup rotates, and re-verify against load direction and magnitude.
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
- preload loss from racewear when one bearing of the paired set is replaced without re-adjusting end play
- rib scoring when axial load is carried beyond the cone rib capacity of the adjusted pair
- cage damage from a mounting blow delivered through the roller complement instead of the ring face
- water-induced pitting when the open bearing is exposed to washdown without external seals
Selection pitfalls — read before you substitute
- At 180 mm bore the 32236UUTG 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 1320 kN C level.
- The heavy-section 32200 family at 180 mm bore (320×91 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 1,500 r/min oil ceiling.
- Grease packs must leave free volume in the 91 mm-wide set; over-greasing a paired bearing churning at the 1,500 r/min oil-band speed raises temperature and destroys the preload setting.
- Back-to-back and face-to-face arrangements react differently to shaft bending: pick the pair orientation for the moment load before locking the 180 mm shoulder geometry, because retrofitting flips the cups.
- Never fit the 180 mm cone by hammering the 320 mm cup: force for both press fits goes through the ring faces only, or brinell marks release as noise within the first running hours.
- The 1320/1690 kN ratings and 157 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32236UUTG (ISO 355 4GD); 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 32236UUTG?
32236UUTG is a metric 4T tapered roller bearing to ISO 355: 180 mm bore, 320 mm outside diameter and 91 mm assembled width T (7.087 × 12.598 × 3.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1320 kN, C0 1690 kN, Pu 157 kN, grease limiting speed 1,100 r/min, oil speed 1,500 r/min, mass about 30400 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32236UUTG?
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 (32236UUTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32236UUTG designation encode the 180 mm bore and what is 4GD?
last two digits 36 are the ISO bore code, ×5 = 180 mm (codes 00–03 use the 10/12/15/17 exception table). The 320 mm OD and 91 mm assembled T follow the ISO 355 dimension-series plan. 4GD 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 32236UUTG list two speeds, 1,100 and 1,500 r/min?
The lower figure, 1,100 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32236UUTG at 1,500 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32236UUTG mean?
Suffix reading on 32236UUTG: the UUTG 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.