32248UTG bearing: complete specifications & equivalents
The 32248UTG is a ISO 355 radial bearing sized 240 x 440 x 127 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 240 mm |
| Outer diameter D | 440 mm |
| Width B | 127 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 2180 kN |
| Basic static load rating C0 | 2750 kN |
| Fatigue load limit Pu | 232 kN |
| Limiting speed (mechanical) | 760 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 78900 g |
| Manufacturer designation | NTN 32248UTG |
| 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 | 9.449 in |
|---|---|
| Outer diameter D | 17.323 in |
| Width B | 5 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 100 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) | 32 of 36 |
| Bore above smallest 32200-series size | 223 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32248UTG | 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 32248UTG model number is decoded
32248UTG is the NTN 4T catalogue entry for a 240×440×127 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 heavy-section 32200 family and a bore code resolving to 240 mm; 440 mm OD and 127 mm assembled T are the matching ISO 355 boundary dimensions shared with other makers of the same dimension series. The 100.0 mm radial section carries the roller complement across the 240–440 mm envelope; section and contact angle differ between NTN metric families even at the same bore, so 302/322/323 are not drop-in swaps. Speed planning uses both catalogue columns: grease 760 r/min is the cage/rib mechanical ceiling for 32248UTG, oil 1,100 r/min is available with circulating oil — a 340 r/min margin at this size. Fillet radii must clear the ring chamfers of the 440 mm cup and 240 mm cone; use undercut shoulders so the rings seat fully rather than bridging on a shaft radius.
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
- cage fatigue when the pair is run continuously near the grease limiting speed without oil cooling
- false brinelling on a stationary paired set exposed to external vibration
Selection pitfalls — read before you substitute
- At 240 mm bore the 32248UTG 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 2180 kN C level.
- The heavy-section 32200 family at 240 mm bore (440×127 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.
- Back-to-back and face-to-face arrangements react differently to shaft bending: pick the pair orientation for the moment load before locking the 240 mm shoulder geometry, because retrofitting flips the cups.
- Back-to-back and face-to-face arrangements react differently to shaft bending: pick the pair orientation for the moment load before locking the 240 mm shoulder geometry, because retrofitting flips the cups.
- The U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering 32248UTG by size alone can deliver the wrong contact-angle execution for a pinion position.
- The 2180/2750 kN ratings and 232 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32248UTG; 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 32248UTG?
32248UTG is a metric 4T tapered roller bearing to ISO 355: 240 mm bore, 440 mm outside diameter and 127 mm assembled width T (9.449 × 17.323 × 5 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2180 kN, C0 2750 kN, Pu 232 kN, grease limiting speed 760 r/min, oil speed 1,100 r/min, mass about 78900 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32248UTG?
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 (32248UTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32248UTG designation encode the 240 mm bore?
last two digits 48 are the ISO bore code, ×5 = 240 mm (codes 00–03 use the 10/12/15/17 exception table). The 440 mm OD and 127 mm assembled T follow the ISO 355 dimension-series plan.
Why does 32248UTG list two speeds, 760 and 1,100 r/min?
The lower figure, 760 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32248UTG 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 32248UTG mean?
Suffix reading on 32248UTG: 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.