32330UTG bearing: complete specifications & equivalents
The 32330UTG is a ISO 355 radial bearing sized 150 x 320 x 114 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 150 mm |
| Outer diameter D | 320 mm |
| Width B | 114 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1490 kN |
| Basic static load rating C0 | 1750 kN |
| Fatigue load limit Pu | 166 kN |
| Limiting speed (mechanical) | 1200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 42100 g |
| Manufacturer designation | NTN 32330UTG |
| 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 | 5.906 in |
|---|---|
| Outer diameter D | 12.598 in |
| Width B | 4.488 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 85 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) | 24 of 30 |
| Bore above smallest 32300-series size | 130 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32330UTG | 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 32330UTG model number is decoded
The NTN 2203E table prints 32330UTG in the extra-heavy 32300 family: 150 mm bore, 320 mm cup OD, 114 mm T, with a grease limiting speed of 1,200 r/min and an oil-lubricated ceiling of 1,700 r/min. Digit by digit, the bare number identifies the extra-heavy 32300 family and a bore code resolving to 150 mm; 320 mm OD and 114 mm assembled T are the matching ISO 355 boundary dimensions shared with other makers of the same dimension series. 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 32330UTG, since running clearance is set during assembly. The fatigue load limit Pu printed for 32330UTG is 166 kN; in the adjusted-life equation that is the equivalent-load floor below which high reliability is expected even under contamination. Re-adjustment after bedding-in is standard practice: re-check end play once the paired 32330UTG arrangement has run in, because initial seat seating relaxes the set preload slightly.
Typical equipment & failure modes
Common applications
- large crusher and SAG/AG-mill drive shafts
- wind-turbine gearbox and main-shaft arrangements
- offshore crane and drawworks drums
- heavy haul railway traction gearboxes
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
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- indentation of the raceways by hard particles in unsealed open arrangements
Selection pitfalls — read before you substitute
- At 150 mm bore the 32330UTG 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 1490 kN C level.
- The extra-heavy 32300 family at 150 mm bore (320×114 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 1,700 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 32330UTG by size alone can deliver the wrong contact-angle execution for a pinion position.
- The U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering 32330UTG by size alone can deliver the wrong contact-angle execution for a pinion position.
- On slash-size and T-code bearings confirm the full code on both cone and cup before fitting: the 150 mm bore alone does not identify the cup, and a mismatched cone/cup set has no catalogue rating.
- The 1490/1750 kN ratings and 166 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32330UTG; 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 32330UTG?
32330UTG is a metric 4T tapered roller bearing to ISO 355: 150 mm bore, 320 mm outside diameter and 114 mm assembled width T (5.906 × 12.598 × 4.488 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1490 kN, C0 1750 kN, Pu 166 kN, grease limiting speed 1,200 r/min, oil speed 1,700 r/min, mass about 42100 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32330UTG?
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 (32330UTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32330UTG designation encode the 150 mm bore?
last two digits 30 are the ISO bore code, ×5 = 150 mm (codes 00–03 use the 10/12/15/17 exception table). The 320 mm OD and 114 mm assembled T follow the ISO 355 dimension-series plan.
Why does 32330UTG list two speeds, 1,200 and 1,700 r/min?
The lower figure, 1,200 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32330UTG at 1,700 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32330UTG mean?
Suffix reading on 32330UTG: 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.