32328UTG bearing: complete specifications & equivalents
The 32328UTG is a ISO 355 radial bearing sized 140 x 300 x 107.75 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 140 mm |
| Outer diameter D | 300 mm |
| Width B | 107.75 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1270 kN |
| Basic static load rating C0 | 1370 kN |
| Fatigue load limit Pu | 132 kN |
| Limiting speed (mechanical) | 1300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 33500 g |
| Manufacturer designation | NTN 32328UTG |
| 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 | 5.512 in |
|---|---|
| Outer diameter D | 11.811 in |
| Width B | 4.242 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 80 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) | 23 of 30 |
| Bore above smallest 32300-series size | 120 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32328UTG | 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 32328UTG model number is decoded
32328UTG is the NTN 4T catalogue entry for a 140×300×107.75 mm metric tapered roller bearing — separable cone and cup, designed for combined radial and axial load as an individually adjusted bearing. Digit by digit, the bare number identifies the extra-heavy 32300 family and a bore code resolving to 140 mm; 300 mm OD and 107.75 mm assembled T are the matching ISO 355 boundary dimensions shared with other makers of the same dimension series. At 1270 kN C the bearing offers about 9.1 kN of dynamic capacity per millimetre of the 140 mm bore — compare any substitution on this ratio and the 107.75 mm assembled T, not on bore alone. The fatigue load limit Pu printed for 32328UTG is 132 kN; in the adjusted-life equation that is the equivalent-load floor below which high reliability is expected even under contamination. Open 4T bearings need application seals; without them the grease at the cone rib of 32328UTG washes out and the rib/roller-end contact smears on the first wet or dusty shift.
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
- cup creep and housing fretting when the specified outer-ring press fit is not achieved
- rib scoring when axial load is carried beyond the cone rib capacity of the adjusted pair
- preload loss from racewear when one bearing of the paired set is replaced without re-adjusting end play
- 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 140 mm bore the 32328UTG 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 1270 kN C level.
- The extra-heavy 32300 family at 140 mm bore (300×107.75 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 1,800 r/min oil ceiling.
- Minimum load matters at high speed: an unloaded 32328UTG at a large fraction of 1,300 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded pair arrangements.
- Do not confuse T (107.75 mm assembled width of cone + cup) with the cone width when drawing spacers; an abutment sized to T instead of the ring width leaves the cup unseated.
- Open 32328UTG units have no seals: a wheel-hub or gearbox application needs external sealing or the 1,300 r/min grease figure is meaningless once water reaches the cone rib.
- The 1270/1370 kN ratings and 132 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32328UTG; 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 32328UTG?
32328UTG is a metric 4T tapered roller bearing to ISO 355: 140 mm bore, 300 mm outside diameter and 107.75 mm assembled width T (5.512 × 11.811 × 4.242 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1270 kN, C0 1370 kN, Pu 132 kN, grease limiting speed 1,300 r/min, oil speed 1,800 r/min, mass about 33500 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32328UTG?
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 (32328UTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32328UTG designation encode the 140 mm bore?
last two digits 28 are the ISO bore code, ×5 = 140 mm (codes 00–03 use the 10/12/15/17 exception table). The 300 mm OD and 107.75 mm assembled T follow the ISO 355 dimension-series plan.
Why does 32328UTG list two speeds, 1,300 and 1,800 r/min?
The lower figure, 1,300 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32328UTG at 1,800 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32328UTG mean?
Suffix reading on 32328UTG: 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.