32964XUUTG bearing: complete specifications & equivalents
The 32964XUUTG is a ISO 355 radial bearing sized 320 x 440 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 | 320 mm |
| Outer diameter D | 440 mm |
| Width B | 76 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1300 kN |
| Basic static load rating C0 | 2150 kN |
| Fatigue load limit Pu | 176 kN |
| Limiting speed (mechanical) | 670 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 32800 g |
| Manufacturer designation | NTN 32964XUUTG |
| 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 | 12.598 in |
|---|---|
| Outer diameter D | 17.323 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) | 31 of 37 |
| Bore above smallest 32900-series size | 285 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32964XUUTG | 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 32964XUUTG model number is decoded
For a 320 mm shaft with a thrust component, NTN lists 32964XUUTG, a metric 4T tapered roller bearing of 1300 kN C and 2150 kN C0 inside the 440 mm OD, 76 mm-wide assembled set. Digit by digit, the bare number identifies the extra-light thin-section 32900 family and a bore code resolving to 320 mm; 440 mm OD and 76 mm assembled T are the matching ISO 355 boundary dimensions shared with other makers of the same dimension series. The 60.0 mm radial section carries the roller complement across the 320–440 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 670 r/min limiting speed targets the rib contact; if the drive needs 960 r/min it must be arranged for oil lubrication with a defined flow to the large roller ends. Mount the 320 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 32964XUUTG.
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 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 320 mm bore the 32964XUUTG 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 1300 kN C level.
- The thin 76 mm section of 32964XUUTG is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 320 mm bore smears the roller ends against the rib.
- Back-to-back and face-to-face arrangements react differently to shaft bending: pick the pair orientation for the moment load before locking the 320 mm shoulder geometry, because retrofitting flips the cups.
- The 60.0 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 32964XUUTG 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 32964XUUTG by size alone can deliver the wrong contact-angle execution for a pinion position.
- The 1300/2150 kN ratings and 176 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32964XUUTG (ISO 355 3FD); 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 32964XUUTG?
32964XUUTG is a metric 4T tapered roller bearing to ISO 355: 320 mm bore, 440 mm outside diameter and 76 mm assembled width T (12.598 × 17.323 × 2.992 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1300 kN, C0 2150 kN, Pu 176 kN, grease limiting speed 670 r/min, oil speed 960 r/min, mass about 32800 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32964XUUTG?
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 (32964XUUTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32964XUUTG designation encode the 320 mm bore and what is 3FD?
last two digits 64 are the ISO bore code, ×5 = 320 mm (codes 00–03 use the 10/12/15/17 exception table). The 440 mm OD and 76 mm assembled T follow the ISO 355 dimension-series plan. 3FD 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 32964XUUTG list two speeds, 670 and 960 r/min?
The lower figure, 670 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32964XUUTG at 960 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32964XUUTG mean?
Suffix reading on 32964XUUTG: 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.