32952XUUTG bearing: complete specifications & equivalents
The 32952XUUTG is a ISO 355 radial bearing sized 260 x 360 x 63.5 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 260 mm |
| Outer diameter D | 360 mm |
| Width B | 63.5 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 905 kN |
| Basic static load rating C0 | 1430 kN |
| Fatigue load limit Pu | 124 kN |
| Limiting speed (mechanical) | 860 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 18700 g |
| Manufacturer designation | NTN 32952XUUTG |
| 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 & 32900-series range
| Bore d | 10.236 in |
|---|---|
| Outer diameter D | 14.173 in |
| Width B | 2.5 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 50 mm |
| Smallest bore in 32900-series | 35 mm |
| Largest outer diameter in 32900-series | 600 mm |
| Width range across 32900-series | 14–100 mm |
| Bore position in 32900-series (smallest first) | 28 of 37 |
| Bore above smallest 32900-series size | 225 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32952XUUTG | 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 32952XUUTG model number is decoded
32952XUUTG belongs to the NTN metric 4T tapered roller range (extra-light thin-section 32900 family); the open bearing leaves sealing to the application and is normally ordered and mounted as an adjustable matched pair. Reading the designation: the leading five digits follow the ISO 355 metric plan (dimension family plus two-digit bore code), and 32952XUUTG resolves to 260 mm bore; the NTN factory mark 4T is stamped on cone and cup but is a brand mark, not a size code, so the catalogue sku is printed without it. The 50.0 mm radial section carries the roller complement across the 260–360 mm envelope; section and contact angle differ between NTN metric families even at the same bore, so 302/322/323 are not drop-in swaps. Grease relubrication at 860 r/min limiting speed targets the rib contact; if the drive needs 1,200 r/min it must be arranged for oil lubrication with a defined flow to the large roller ends. Open 4T bearings need application seals; without them the grease at the cone rib of 32952XUUTG washes out and the rib/roller-end contact smears on the first wet or dusty shift.
Typical equipment & failure modes
Common applications
- offshore crane and drawworks drums
- heavy haul railway traction gearboxes
- large marine propulsion reduction gears
- cement-plant kiln and mill drive trains
Known failure patterns
- cone-raceway spalling at the large rib when preload is set too high for the lubricant film
- smearing on the roller large ends and cone rib after a dry start with preload but no oil film
- flaking on one cone only when a back-to-back / face-to-face pair is loaded unevenly by a bent shaft
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- fretting corrosion on a loose cone seat that creeps under rotating load
Selection pitfalls — read before you substitute
- At 260 mm bore the 32952XUUTG 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 905 kN C level.
- The thin 63.5 mm section of 32952XUUTG is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 260 mm bore smears the roller ends against the rib.
- ISO 355 makes the 260×360 mm envelope interchangeable but not the ratings: NTN prints 905/1430 kN for this execution, and a cheaper same-number part can differ in roller complement and steel.
- The 50.0 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 32952XUUTG or the ring will bottom out on the radius instead of the shoulder face.
- The U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering 32952XUUTG by size alone can deliver the wrong contact-angle execution for a pinion position.
- The 905/1430 kN ratings and 124 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32952XUUTG (ISO 355 3EC); 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 32952XUUTG?
32952XUUTG is a metric 4T tapered roller bearing to ISO 355: 260 mm bore, 360 mm outside diameter and 63.5 mm assembled width T (10.236 × 14.173 × 2.5 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 905 kN, C0 1430 kN, Pu 124 kN, grease limiting speed 860 r/min, oil speed 1,200 r/min, mass about 18700 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32952XUUTG?
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 (32952XUUTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32952XUUTG designation encode the 260 mm bore and what is 3EC?
last two digits 52 are the ISO bore code, ×5 = 260 mm (codes 00–03 use the 10/12/15/17 exception table). The 360 mm OD and 63.5 mm assembled T follow the ISO 355 dimension-series plan. 3EC 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 32952XUUTG list two speeds, 860 and 1,200 r/min?
The lower figure, 860 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32952XUUTG at 1,200 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32952XUUTG mean?
Suffix reading on 32952XUUTG: the XUUTG suffix marks the ULTAGE specification for large NTN tapered rollers — upgraded material and internal design for longer life inside the unchanged ISO 355 envelope; XU combines the X ISO boundary section with the U uprated internal design; 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.