32338UTG bearing: complete specifications & equivalents
The 32338UTG is a ISO 355 radial bearing sized 190 x 400 x 140 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 | 400 mm |
| Width B | 140 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 2040 kN |
| Basic static load rating C0 | 2390 kN |
| Fatigue load limit Pu | 211 kN |
| Limiting speed (mechanical) | 900 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 77000 g |
| Manufacturer designation | NTN 32338UTG |
| 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 & 32300-series range
| Bore d | 7.48 in |
|---|---|
| Outer diameter D | 15.748 in |
| Width B | 5.512 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 105 mm |
| Smallest bore in 32300-series | 20 mm |
| Largest outer diameter in 32300-series | 460 mm |
| Width range across 32300-series | 22.25–154 mm |
| Bore position in 32300-series (smallest first) | 28 of 30 |
| Bore above smallest 32300-series size | 170 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32338UTG | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
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 32338UTG model number is decoded
NTN supplies this 190 mm bore tapered roller position as 32338UTG: one cone assembly, one cup, line-contact rollers and a steel cage, rated 2040 kN basic dynamic and 2390 kN static on the extra-heavy 32300 family. On the NTN nameplate the parts carry 4T plus the bare code, while 2203E orders 32338UTG by the metric ISO 355 number: 190 mm bore, 400 mm OD. 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 32338UTG, not only the raceway. Speed planning uses both catalogue columns: grease 900 r/min is the cage/rib mechanical ceiling for 32338UTG, oil 1,300 r/min is available with circulating oil — a 400 r/min margin at this size. With a rotating shaft a m6/n6 shaft seat and a press-fit cup are typical catalogue practice for 32338UTG; reverse the logic if the cup rotates, and re-verify against load direction and magnitude.
Typical equipment & failure modes
Common applications
- wind-turbine gearbox and main-shaft arrangements
- offshore crane and drawworks drums
- heavy haul railway traction gearboxes
- large marine propulsion reduction gears
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
- cage damage from a mounting blow delivered through the roller complement instead of the ring face
- fretting corrosion on a loose cone seat that creeps under rotating load
Selection pitfalls — read before you substitute
- At 190 mm bore the 32338UTG 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 2040 kN C level.
- The extra-heavy 32300 family at 190 mm bore (400×140 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 1,300 r/min oil ceiling.
- Replacing one half of an adjusted pair without resetting end play negates the 140 mm T dimension logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- Replacing one half of an adjusted pair without resetting end play negates the 140 mm T dimension logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- Back-to-back and face-to-face arrangements react differently to shaft bending: pick the pair orientation for the moment load before locking the 190 mm shoulder geometry, because retrofitting flips the cups.
- The 2040/2390 kN ratings and 211 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32338UTG; 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 32338UTG?
32338UTG is a metric 4T tapered roller bearing to ISO 355: 190 mm bore, 400 mm outside diameter and 140 mm assembled width T (7.48 × 15.748 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2040 kN, C0 2390 kN, Pu 211 kN, grease limiting speed 900 r/min, oil speed 1,300 r/min, mass about 77000 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32338UTG?
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 (32338UTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32338UTG designation encode the 190 mm bore?
last two digits 38 are the ISO bore code, ×5 = 190 mm (codes 00–03 use the 10/12/15/17 exception table). The 400 mm OD and 140 mm assembled T follow the ISO 355 dimension-series plan.
Why does 32338UTG list two speeds, 900 and 1,300 r/min?
The lower figure, 900 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32338UTG at 1,300 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32338UTG mean?
Suffix reading on 32338UTG: the UTG 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.