32040XUUTG bearing: complete specifications & equivalents
The 32040XUUTG is a ISO 355 radial bearing sized 200 x 310 x 70 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 200 mm |
| Outer diameter D | 310 mm |
| Width B | 70 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1030 kN |
| Basic static load rating C0 | 1470 kN |
| Fatigue load limit Pu | 135 kN |
| Limiting speed (mechanical) | 1100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 19200 g |
| Manufacturer designation | NTN 32040XUUTG |
| 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 | 7.874 in |
|---|---|
| Outer diameter D | 12.205 in |
| Width B | 2.756 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 55 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) | 31 of 43 |
| Bore above smallest 32000-series size | 180 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32040XUUTG | 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 32040XUUTG model number is decoded
32040XUUTG is the NTN 4T catalogue entry for a 200×310×70 mm metric tapered roller bearing — separable cone and cup, designed for combined radial and axial load as an individually adjusted bearing. NTN also quotes this bearing with its ISO 355 dimension-series abbreviation, 4FD, which is the maker-neutral cross-reference for the 200×310 mm envelope; 4T is NTN's own tapered-roller brand mark on the parts. The 55.0 mm radial section carries the roller complement across the 200–310 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. The two speed columns differ by a factor of .73 (grease/limiting 1,100 vs oil 1,500 r/min); heat generation at the cone rib decides which lubrication a real 32040XUUTG arrangement can sustain. Fillet radii must clear the ring chamfers of the 310 mm cup and 200 mm cone; use undercut shoulders so the rings seat fully rather than bridging on a shaft radius.
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
- cone-raceway spalling at the large rib when preload is set too high for the lubricant film
- smearing on the roller large ends and cone rib after a dry start with preload but no oil film
- flaking on one cone only when a back-to-back / face-to-face pair is loaded unevenly by a bent shaft
- 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 200 mm bore the 32040XUUTG 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 1030 kN C level.
- The thin 70 mm section of 32040XUUTG is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 200 mm bore smears the roller ends against the rib.
- Never fit the 200 mm cone by hammering the 310 mm cup: force for both press fits goes through the ring faces only, or brinell marks release as noise within the first running hours.
- Never fit the 200 mm cone by hammering the 310 mm cup: force for both press fits goes through the ring faces only, or brinell marks release as noise within the first running hours.
- The U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering 32040XUUTG by size alone can deliver the wrong contact-angle execution for a pinion position.
- The 1030/1470 kN ratings and 135 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32040XUUTG (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 32040XUUTG?
32040XUUTG is a metric 4T tapered roller bearing to ISO 355: 200 mm bore, 310 mm outside diameter and 70 mm assembled width T (7.874 × 12.205 × 2.756 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1030 kN, C0 1470 kN, Pu 135 kN, grease limiting speed 1,100 r/min, oil speed 1,500 r/min, mass about 19200 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32040XUUTG?
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 (32040XUUTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32040XUUTG designation encode the 200 mm bore and what is 4FD?
last two digits 40 are the ISO bore code, ×5 = 200 mm (codes 00–03 use the 10/12/15/17 exception table). The 310 mm OD and 70 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 32040XUUTG list two speeds, 1,100 and 1,500 r/min?
The lower figure, 1,100 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32040XUUTG at 1,500 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32040XUUTG mean?
Suffix reading on 32040XUUTG: 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.