32340UTG bearing: complete specifications & equivalents
The 32340UTG is a ISO 355 radial bearing sized 200 x 420 x 146 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 | 420 mm |
| Width B | 146 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 2240 kN |
| Basic static load rating C0 | 2650 kN |
| Fatigue load limit Pu | 230 kN |
| Limiting speed (mechanical) | 850 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 89600 g |
| Manufacturer designation | NTN 32340UTG |
| 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 | 7.874 in |
|---|---|
| Outer diameter D | 16.535 in |
| Width B | 5.748 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 110 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) | 29 of 30 |
| Bore above smallest 32300-series size | 180 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32340UTG | 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 32340UTG model number is decoded
For a 200 mm shaft with a thrust component, NTN lists 32340UTG, a metric 4T tapered roller bearing of 2240 kN C and 2650 kN C0 inside the 420 mm OD, 146 mm-wide assembled set. On the NTN nameplate the parts carry 4T plus the bare code, while 2203E orders 32340UTG by the metric ISO 355 number: 200 mm bore, 420 mm OD. NTN grades 4T metric bearings as open bearings without integral seals; at 200 mm bore the application supplies the seals and the grease fill or oil supply to the ISO 355 assembly. Speed planning uses both catalogue columns: grease 850 r/min is the cage/rib mechanical ceiling for 32340UTG, oil 1,200 r/min is available with circulating oil — a 350 r/min margin at this size. Re-adjustment after bedding-in is standard practice: re-check end play once the paired 32340UTG arrangement has run in, because initial seat seating relaxes the set preload slightly.
Typical equipment & failure modes
Common applications
- offshore crane and drawworks drums
- heavy haul railway traction gearboxes
- large marine propulsion reduction gears
- cement-plant kiln and mill drive trains
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 32340UTG 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 2240 kN C level.
- The extra-heavy 32300 family at 200 mm bore (420×146 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 1,200 r/min oil ceiling.
- ISO 355 makes the 200×420 mm envelope interchangeable but not the ratings: NTN prints 2240/2650 kN for this execution, and a cheaper same-number part can differ in roller complement and steel.
- The 110.0 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 32340UTG or the ring will bottom out on the radius instead of the shoulder face.
- The 110.0 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 32340UTG or the ring will bottom out on the radius instead of the shoulder face.
- The 2240/2650 kN ratings and 230 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32340UTG; 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 32340UTG?
32340UTG is a metric 4T tapered roller bearing to ISO 355: 200 mm bore, 420 mm outside diameter and 146 mm assembled width T (7.874 × 16.535 × 5.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2240 kN, C0 2650 kN, Pu 230 kN, grease limiting speed 850 r/min, oil speed 1,200 r/min, mass about 89600 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32340UTG?
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 (32340UTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32340UTG designation encode the 200 mm bore?
last two digits 40 are the ISO bore code, ×5 = 200 mm (codes 00–03 use the 10/12/15/17 exception table). The 420 mm OD and 146 mm assembled T follow the ISO 355 dimension-series plan.
Why does 32340UTG list two speeds, 850 and 1,200 r/min?
The lower figure, 850 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32340UTG at 1,200 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32340UTG mean?
Suffix reading on 32340UTG: 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.