32972XUUTG bearing: complete specifications & equivalents
The 32972XUUTG is a ISO 355 radial bearing sized 360 x 480 x 76 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 360 mm |
| Outer diameter D | 480 mm |
| Width B | 76 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1350 kN |
| Basic static load rating C0 | 2330 kN |
| Fatigue load limit Pu | 185 kN |
| Limiting speed (mechanical) | 590 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 36300 g |
| Manufacturer designation | NTN 32972XUUTG |
| 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 | 14.173 in |
|---|---|
| Outer diameter D | 18.898 in |
| Width B | 2.992 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 60 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) | 33 of 37 |
| Bore above smallest 32900-series size | 325 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32972XUUTG | 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 32972XUUTG model number is decoded
32972XUUTG 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. NTN also quotes this bearing with its ISO 355 dimension-series abbreviation, 4FD, which is the maker-neutral cross-reference for the 360×480 mm envelope; 4T is NTN's own tapered-roller brand mark on the parts. The rollers run with their large ends against the cone's integral guide rib; the rib/end-flange contact carries the thrust component and is the reason lubricant must reach the rib face of 32972XUUTG, not only the raceway. The two speed columns differ by a factor of .70 (grease/limiting 590 vs oil 840 r/min); heat generation at the cone rib decides which lubrication a real 32972XUUTG arrangement can sustain. Mount the 360 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 32972XUUTG.
Typical equipment & failure modes
Common applications
- wind-turbine gearbox and main-shaft arrangements
- offshore crane and drawworks drums
- heavy haul railway traction gearboxes
- large marine propulsion reduction gears
Known failure patterns
- cone-raceway spalling at the large rib when preload is set too high for the lubricant film
- 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
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- false brinelling on a stationary paired set exposed to external vibration
Selection pitfalls — read before you substitute
- At 360 mm bore the 32972XUUTG 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 1350 kN C level.
- The thin 76 mm section of 32972XUUTG is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 360 mm bore smears the roller ends against the rib.
- Do not confuse T (76 mm assembled width of cone + cup) with the cone width when drawing spacers; an abutment sized to T instead of the ring width leaves the cup unseated.
- The U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering 32972XUUTG by size alone can deliver the wrong contact-angle execution for a pinion position.
- Back-to-back and face-to-face arrangements react differently to shaft bending: pick the pair orientation for the moment load before locking the 360 mm shoulder geometry, because retrofitting flips the cups.
- The 1350/2330 kN ratings and 185 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32972XUUTG (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 32972XUUTG?
32972XUUTG is a metric 4T tapered roller bearing to ISO 355: 360 mm bore, 480 mm outside diameter and 76 mm assembled width T (14.173 × 18.898 × 2.992 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1350 kN, C0 2330 kN, Pu 185 kN, grease limiting speed 590 r/min, oil speed 840 r/min, mass about 36300 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32972XUUTG?
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 (32972XUUTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32972XUUTG designation encode the 360 mm bore and what is 4FD?
last two digits 72 are the ISO bore code, ×5 = 360 mm (codes 00–03 use the 10/12/15/17 exception table). The 480 mm OD and 76 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 32972XUUTG list two speeds, 590 and 840 r/min?
The lower figure, 590 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32972XUUTG at 840 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32972XUUTG mean?
Suffix reading on 32972XUUTG: 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.