32064XUUTG bearing: complete specifications & equivalents
The 32064XUUTG is a ISO 355 radial bearing sized 320 x 480 x 100 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 | 480 mm |
| Width B | 100 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1940 kN |
| Basic static load rating C0 | 2940 kN |
| Fatigue load limit Pu | 237 kN |
| Limiting speed (mechanical) | 630 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 60200 g |
| Manufacturer designation | NTN 32064XUUTG |
| 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 & 32000-series range
| Bore d | 12.598 in |
|---|---|
| Outer diameter D | 18.898 in |
| Width B | 3.937 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 80 mm |
| Smallest bore in 32000-series | 20 mm |
| Largest outer diameter in 32000-series | 650 mm |
| Width range across 32000-series | 15–130 mm |
| Bore position in 32000-series (smallest first) | 37 of 43 |
| Bore above smallest 32000-series size | 300 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32064XUUTG | 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 32064XUUTG model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the NTN order number 32064XUUTG denotes the low-section 32000 family tuned for low friction of metric tapered roller bearings, 320 mm bore, 480 mm outside diameter and 100 mm assembled width T (12.598 × 18.898 × 3.937 in) to the ISO 355 boundary plan. On the NTN nameplate the parts carry 4T plus the bare code, while 2203E orders 32064XUUTG by the metric ISO 355 number (ISO series abbreviation 4GD): 320 mm bore, 480 mm OD. Suffix reading on 32064XUUTG: 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. Selection: C 1940 kN against C0 2940 kN gives a C0/C ratio of 1.52 for the 320 mm bore, and the equivalent combined load must keep below the rating at the target L10 with the pair counted as one unit. When pairing 32064XUUTG with a second tapered bearing, keep the matched arrangement clean: a single stray grit particle between cup and housing changes preload faster than the adjustment range can correct.
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
- cone-raceway spalling at the large rib when preload is set too high for the lubricant film
- 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
- 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 320 mm bore the 32064XUUTG 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 1940 kN C level.
- The thin 100 mm section of 32064XUUTG 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.
- Do not confuse T (100 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.
- On slash-size and T-code bearings confirm the full code on both cone and cup before fitting: the 320 mm bore alone does not identify the cup, and a mismatched cone/cup set has no catalogue rating.
- ISO 355 makes the 320×480 mm envelope interchangeable but not the ratings: NTN prints 1940/2940 kN for this execution, and a cheaper same-number part can differ in roller complement and steel.
- The 1940/2940 kN ratings and 237 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32064XUUTG (ISO 355 4GD); 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 32064XUUTG?
32064XUUTG is a metric 4T tapered roller bearing to ISO 355: 320 mm bore, 480 mm outside diameter and 100 mm assembled width T (12.598 × 18.898 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1940 kN, C0 2940 kN, Pu 237 kN, grease limiting speed 630 r/min, oil speed 900 r/min, mass about 60200 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32064XUUTG?
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 (32064XUUTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32064XUUTG designation encode the 320 mm bore and what is 4GD?
last two digits 64 are the ISO bore code, ×5 = 320 mm (codes 00–03 use the 10/12/15/17 exception table). The 480 mm OD and 100 mm assembled T follow the ISO 355 dimension-series plan. 4GD 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 32064XUUTG 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 32064XUUTG 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 32064XUUTG mean?
Suffix reading on 32064XUUTG: 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.