32968XUUTG bearing: complete specifications & equivalents
The 32968XUUTG is a ISO 355 radial bearing sized 340 x 460 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 | 340 mm |
| Outer diameter D | 460 mm |
| Width B | 76 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1340 kN |
| Basic static load rating C0 | 2270 kN |
| Fatigue load limit Pu | 183 kN |
| Limiting speed (mechanical) | 630 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 34500 g |
| Manufacturer designation | NTN 32968XUUTG |
| 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 | 13.386 in |
|---|---|
| Outer diameter D | 18.11 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) | 32 of 37 |
| Bore above smallest 32900-series size | 305 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32968XUUTG | 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 32968XUUTG model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the NTN order number 32968XUUTG denotes the extra-light thin-section 32900 family of metric tapered roller bearings, 340 mm bore, 460 mm outside diameter and 76 mm assembled width T (13.386 × 18.11 × 2.992 in) to the ISO 355 boundary plan. Digit by digit, the bare number identifies the extra-light thin-section 32900 family and a bore code resolving to 340 mm; 460 mm OD and 76 mm assembled T are the matching ISO 355 boundary dimensions shared with other makers of the same dimension series. Suffix reading on 32968XUUTG: 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. Catalogue mass of the 32968XUUTG set is 34500 g (1.358 lb cone + cup); abutment and shaft shoulder design must carry that mass square to the axis. Re-adjustment after bedding-in is standard practice: re-check end play once the paired 32968XUUTG arrangement has run in, because initial seat seating relaxes the set preload slightly.
Typical equipment & failure modes
Common applications
- cement-plant kiln and mill drive trains
- rolling-mill roll-neck and gearbox positions
- large crusher and SAG/AG-mill drive shafts
- wind-turbine gearbox and main-shaft arrangements
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 340 mm bore the 32968XUUTG 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 1340 kN C level.
- The thin 76 mm section of 32968XUUTG is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 340 mm bore smears the roller ends against the rib.
- Grease packs must leave free volume in the 76 mm-wide set; over-greasing a paired bearing churning at the 900 r/min oil-band speed raises temperature and destroys the preload setting.
- Open 32968XUUTG units have no seals: a wheel-hub or gearbox application needs external sealing or the 630 r/min grease figure is meaningless once water reaches the cone rib.
- ISO 355 makes the 340×460 mm envelope interchangeable but not the ratings: NTN prints 1340/2270 kN for this execution, and a cheaper same-number part can differ in roller complement and steel.
- The 1340/2270 kN ratings and 183 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32968XUUTG (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 32968XUUTG?
32968XUUTG is a metric 4T tapered roller bearing to ISO 355: 340 mm bore, 460 mm outside diameter and 76 mm assembled width T (13.386 × 18.11 × 2.992 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1340 kN, C0 2270 kN, Pu 183 kN, grease limiting speed 630 r/min, oil speed 900 r/min, mass about 34500 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32968XUUTG?
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 (32968XUUTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32968XUUTG designation encode the 340 mm bore and what is 4FD?
last two digits 68 are the ISO bore code, ×5 = 340 mm (codes 00–03 use the 10/12/15/17 exception table). The 460 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 32968XUUTG list two speeds, 630 and 900 r/min?
The lower figure, 630 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32968XUUTG at 900 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32968XUUTG mean?
Suffix reading on 32968XUUTG: 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.