32238UUTG bearing: complete specifications & equivalents
The 32238UUTG is a ISO 355 radial bearing sized 190 x 340 x 97 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 190 mm |
| Outer diameter D | 340 mm |
| Width B | 97 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1480 kN |
| Basic static load rating C0 | 1850 kN |
| Fatigue load limit Pu | 169 kN |
| Limiting speed (mechanical) | 1000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 36100 g |
| Manufacturer designation | NTN 32238UUTG |
| 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 & 32200-series range
| Bore d | 7.48 in |
|---|---|
| Outer diameter D | 13.386 in |
| Width B | 3.819 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 75 mm |
| Smallest bore in 32200-series | 17 mm |
| Largest outer diameter in 32200-series | 580 mm |
| Width range across 32200-series | 17.25–159 mm |
| Bore position in 32200-series (smallest first) | 29 of 36 |
| Bore above smallest 32200-series size | 173 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32238UUTG | 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 32238UUTG model number is decoded
32238UUTG is the NTN 4T catalogue entry for a 190×340×97 mm metric tapered roller bearing — separable cone and cup, designed for combined radial and axial load as an individually adjusted bearing. On the NTN nameplate the parts carry 4T plus the bare code, while 2203E orders 32238UUTG by the metric ISO 355 number (ISO series abbreviation 4GD): 190 mm bore, 340 mm OD. NTN adjusts these bearings by cup or cone position rather than shipping a preloaded set; the mounting drawing must state end play or preload for 32238UUTG, since running clearance is set during assembly. The 7.8 kN-per-mm-bore capacity figure for 32238UUTG summarises the 1480 kN rating over 190 mm bore; use it to sanity-check an interchange candidate before swapping brands. Fillet radii must clear the ring chamfers of the 340 mm cup and 190 mm cone; use undercut shoulders so the rings seat fully rather than bridging on a shaft radius.
Typical equipment & failure modes
Common applications
- large marine propulsion reduction gears
- cement-plant kiln and mill drive trains
- rolling-mill roll-neck and gearbox positions
- large crusher and SAG/AG-mill drive shafts
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 damage from a mounting blow delivered through the roller complement instead of the ring face
- false brinelling on a stationary paired set exposed to external vibration
Selection pitfalls — read before you substitute
- At 190 mm bore the 32238UUTG 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 1480 kN C level.
- The heavy-section 32200 family at 190 mm bore (340×97 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 1,400 r/min oil ceiling.
- Minimum load matters at high speed: an unloaded 32238UUTG at a large fraction of 1,000 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded pair arrangements.
- On slash-size and T-code bearings confirm the full code on both cone and cup before fitting: the 190 mm bore alone does not identify the cup, and a mismatched cone/cup set has no catalogue rating.
- On slash-size and T-code bearings confirm the full code on both cone and cup before fitting: the 190 mm bore alone does not identify the cup, and a mismatched cone/cup set has no catalogue rating.
- The 1480/1850 kN ratings and 169 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32238UUTG (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 32238UUTG?
32238UUTG is a metric 4T tapered roller bearing to ISO 355: 190 mm bore, 340 mm outside diameter and 97 mm assembled width T (7.48 × 13.386 × 3.819 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1480 kN, C0 1850 kN, Pu 169 kN, grease limiting speed 1,000 r/min, oil speed 1,400 r/min, mass about 36100 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32238UUTG?
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 (32238UUTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32238UUTG designation encode the 190 mm bore and what is 4GD?
last two digits 38 are the ISO bore code, ×5 = 190 mm (codes 00–03 use the 10/12/15/17 exception table). The 340 mm OD and 97 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 32238UUTG list two speeds, 1,000 and 1,400 r/min?
The lower figure, 1,000 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32238UUTG at 1,400 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32238UUTG mean?
Suffix reading on 32238UUTG: the UUTG suffix marks the ULTAGE specification for large NTN tapered rollers — upgraded material and internal design for longer life inside the unchanged ISO 355 envelope; 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.