32234UUTG bearing: complete specifications & equivalents
The 32234UUTG is a ISO 355 radial bearing sized 170 x 310 x 91 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 170 mm |
| Outer diameter D | 310 mm |
| Width B | 91 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1280 kN |
| Basic static load rating C0 | 1600 kN |
| Fatigue load limit Pu | 150 kN |
| Limiting speed (mechanical) | 1100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 29200 g |
| Manufacturer designation | NTN 32234UUTG |
| 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 | 6.693 in |
|---|---|
| Outer diameter D | 12.205 in |
| Width B | 3.583 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 70 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) | 27 of 36 |
| Bore above smallest 32200-series size | 153 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32234UUTG | 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 32234UUTG model number is decoded
32234UUTG is the NTN 4T catalogue entry for a 170×310×91 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, 4GD, which is the maker-neutral cross-reference for the 170×310 mm envelope; 4T is NTN's own tapered-roller brand mark on the parts. The pressed-steel cage and surface-finished roller ends are standard 4T execution; ULTAGE-marked variants use upgraded material and internal geometry aimed at longer rating life with the same ISO 355 envelope. Speed planning uses both catalogue columns: grease 1,100 r/min is the cage/rib mechanical ceiling for 32234UUTG, oil 1,600 r/min is available with circulating oil — a 500 r/min margin at this size. Open 4T bearings need application seals; without them the grease at the cone rib of 32234UUTG 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
- 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
- indentation of the raceways by hard particles in unsealed open arrangements
Selection pitfalls — read before you substitute
- At 170 mm bore the 32234UUTG 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 1280 kN C level.
- The heavy-section 32200 family at 170 mm bore (310×91 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 1,600 r/min oil ceiling.
- The U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering 32234UUTG by size alone can deliver the wrong contact-angle execution for a pinion position.
- Never fit the 170 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.
- Replacing one half of an adjusted pair without resetting end play negates the 91 mm T dimension logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- The 1280/1600 kN ratings and 150 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32234UUTG (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 32234UUTG?
32234UUTG is a metric 4T tapered roller bearing to ISO 355: 170 mm bore, 310 mm outside diameter and 91 mm assembled width T (6.693 × 12.205 × 3.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1280 kN, C0 1600 kN, Pu 150 kN, grease limiting speed 1,100 r/min, oil speed 1,600 r/min, mass about 29200 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32234UUTG?
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 (32234UUTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32234UUTG designation encode the 170 mm bore and what is 4GD?
last two digits 34 are the ISO bore code, ×5 = 170 mm (codes 00–03 use the 10/12/15/17 exception table). The 310 mm OD and 91 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 32234UUTG list two speeds, 1,100 and 1,600 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 32234UUTG at 1,600 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32234UUTG mean?
Suffix reading on 32234UUTG: 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.