32344UTG bearing: complete specifications & equivalents
The 32344UTG is a ISO 355 radial bearing sized 220 x 460 x 154 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 220 mm |
| Outer diameter D | 460 mm |
| Width B | 154 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 2590 kN |
| Basic static load rating C0 | 3050 kN |
| Fatigue load limit Pu | 259 kN |
| Limiting speed (mechanical) | 770 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 110000 g |
| Manufacturer designation | NTN 32344UTG |
| 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 | 8.661 in |
|---|---|
| Outer diameter D | 18.11 in |
| Width B | 6.063 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 120 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) | 30 of 30 |
| Bore above smallest 32300-series size | 200 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32344UTG | 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 32344UTG model number is decoded
The NTN 2203E table prints 32344UTG in the extra-heavy 32300 family: 220 mm bore, 460 mm cup OD, 154 mm T, with a grease limiting speed of 770 r/min and an oil-lubricated ceiling of 1,100 r/min. NTN also quotes this bearing with its ISO 355 dimension-series abbreviation which is the maker-neutral cross-reference for the 220×460 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 770 r/min is the cage/rib mechanical ceiling for 32344UTG, oil 1,100 r/min is available with circulating oil — a 330 r/min margin at this size. After mounting check the contact pattern with marking blue: a pattern biased to the large or small roller end means the 220 mm pair is misadjusted and the 154 mm T set will edge-load in service.
Typical equipment & failure modes
Common applications
- rolling-mill roll-neck and gearbox positions
- large crusher and SAG/AG-mill drive shafts
- wind-turbine gearbox and main-shaft arrangements
- offshore crane and drawworks drums
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
- fretting corrosion on a loose cone seat that creeps under rotating load
Selection pitfalls — read before you substitute
- At 220 mm bore the 32344UTG 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 2590 kN C level.
- The extra-heavy 32300 family at 220 mm bore (460×154 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 1,100 r/min oil ceiling.
- Minimum load matters at high speed: an unloaded 32344UTG at a large fraction of 770 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded pair arrangements.
- Grease packs must leave free volume in the 154 mm-wide set; over-greasing a paired bearing churning at the 1,100 r/min oil-band speed raises temperature and destroys the preload setting.
- Replacing one half of an adjusted pair without resetting end play negates the 154 mm T dimension logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- The 2590/3050 kN ratings and 259 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32344UTG; 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 32344UTG?
32344UTG is a metric 4T tapered roller bearing to ISO 355: 220 mm bore, 460 mm outside diameter and 154 mm assembled width T (8.661 × 18.11 × 6.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2590 kN, C0 3050 kN, Pu 259 kN, grease limiting speed 770 r/min, oil speed 1,100 r/min, mass about 110000 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32344UTG?
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 (32344UTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32344UTG designation encode the 220 mm bore?
last two digits 44 are the ISO bore code, ×5 = 220 mm (codes 00–03 use the 10/12/15/17 exception table). The 460 mm OD and 154 mm assembled T follow the ISO 355 dimension-series plan.
Why does 32344UTG list two speeds, 770 and 1,100 r/min?
The lower figure, 770 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32344UTG at 1,100 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32344UTG mean?
Suffix reading on 32344UTG: 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.