32960XUUTG bearing: complete specifications & equivalents
The 32960XUUTG is a ISO 355 radial bearing sized 300 x 420 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 | 300 mm |
| Outer diameter D | 420 mm |
| Width B | 76 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1290 kN |
| Basic static load rating C0 | 2090 kN |
| Fatigue load limit Pu | 173 kN |
| Limiting speed (mechanical) | 720 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 31400 g |
| Manufacturer designation | NTN 32960XUUTG |
| 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 | 11.811 in |
|---|---|
| Outer diameter D | 16.535 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) | 30 of 37 |
| Bore above smallest 32900-series size | 265 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32960XUUTG | 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 32960XUUTG model number is decoded
32960XUUTG is a metric single-row tapered roller bearing in the NTN 4T programme: a pressed-steel cage guides profiled rollers between a separable cone and cup on the 300×420 mm ISO 355 envelope, with 76 mm overall assembled width T. Digit by digit, the bare number identifies the extra-light thin-section 32900 family and a bore code resolving to 300 mm; 420 mm OD and 76 mm assembled T are the matching ISO 355 boundary dimensions shared with other makers of the same dimension series. 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 32960XUUTG, not only the raceway. The two speed columns differ by a factor of .72 (grease/limiting 720 vs oil 1,000 r/min); heat generation at the cone rib decides which lubrication a real 32960XUUTG arrangement can sustain. Open 4T bearings need application seals; without them the grease at the cone rib of 32960XUUTG washes out and the rib/roller-end contact smears on the first wet or dusty shift.
Typical equipment & failure modes
Common applications
- heavy haul railway traction gearboxes
- large marine propulsion reduction gears
- cement-plant kiln and mill drive trains
- rolling-mill roll-neck and gearbox positions
Known failure patterns
- cup creep and housing fretting when the specified outer-ring press fit is not achieved
- flaking on one cone only when a back-to-back / face-to-face pair is loaded unevenly by a bent shaft
- smearing on the roller large ends and cone rib after a dry start with preload but no oil film
- cage fatigue when the pair is run continuously near the grease limiting speed without oil cooling
- water-induced pitting when the open bearing is exposed to washdown without external seals
Selection pitfalls — read before you substitute
- At 300 mm bore the 32960XUUTG 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 1290 kN C level.
- The thin 76 mm section of 32960XUUTG is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 300 mm bore smears the roller ends against the rib.
- Open 32960XUUTG units have no seals: a wheel-hub or gearbox application needs external sealing or the 720 r/min grease figure is meaningless once water reaches the cone rib.
- The U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering 32960XUUTG 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 300 mm shoulder geometry, because retrofitting flips the cups.
- The 1290/2090 kN ratings and 173 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32960XUUTG (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 32960XUUTG?
32960XUUTG is a metric 4T tapered roller bearing to ISO 355: 300 mm bore, 420 mm outside diameter and 76 mm assembled width T (11.811 × 16.535 × 2.992 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1290 kN, C0 2090 kN, Pu 173 kN, grease limiting speed 720 r/min, oil speed 1,000 r/min, mass about 31400 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32960XUUTG?
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 (32960XUUTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32960XUUTG designation encode the 300 mm bore and what is 3FD?
last two digits 60 are the ISO bore code, ×5 = 300 mm (codes 00–03 use the 10/12/15/17 exception table). The 420 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 32960XUUTG list two speeds, 720 and 1,000 r/min?
The lower figure, 720 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32960XUUTG at 1,000 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32960XUUTG mean?
Suffix reading on 32960XUUTG: 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.