32948XUUTG bearing: complete specifications & equivalents
The 32948XUUTG is a ISO 355 radial bearing sized 240 x 320 x 51 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 | 320 mm |
| Width B | 51 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 625 kN |
| Basic static load rating C0 | 1000 kN |
| Fatigue load limit Pu | 90 kN |
| Limiting speed (mechanical) | 940 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 10900 g |
| Manufacturer designation | NTN 32948XUUTG |
| 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 & 32900-series range
| Bore d | 9.449 in |
|---|---|
| Outer diameter D | 12.598 in |
| Width B | 2.008 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 40 mm |
| Smallest bore in 32900-series | 35 mm |
| Largest outer diameter in 32900-series | 600 mm |
| Width range across 32900-series | 14–100 mm |
| Bore position in 32900-series (smallest first) | 27 of 37 |
| Bore above smallest 32900-series size | 205 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32948XUUTG | 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 32948XUUTG model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the NTN order number 32948XUUTG denotes the extra-light thin-section 32900 family of metric tapered roller bearings, 240 mm bore, 320 mm outside diameter and 51 mm assembled width T (9.449 × 12.598 × 2.008 in) to the ISO 355 boundary plan. On the NTN nameplate the parts carry 4T plus the bare code, while 2203E orders 32948XUUTG by the metric ISO 355 number (ISO series abbreviation 4EC): 240 mm bore, 320 mm OD. At 625 kN C the bearing offers about 2.6 kN of dynamic capacity per millimetre of the 240 mm bore — compare any substitution on this ratio and the 51 mm assembled T, not on bore alone. The two speed columns differ by a factor of .72 (grease/limiting 940 vs oil 1,300 r/min); heat generation at the cone rib decides which lubrication a real 32948XUUTG arrangement can sustain. After mounting check the contact pattern with marking blue: a pattern biased to the large or small roller end means the 240 mm pair is misadjusted and the 51 mm T set will edge-load in service.
Typical equipment & failure modes
Common applications
- cement-plant kiln and mill drive trains
- rolling-mill roll-neck and gearbox positions
- large crusher and SAG/AG-mill drive shafts
- wind-turbine gearbox and main-shaft arrangements
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 240 mm bore the 32948XUUTG 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 625 kN C level.
- The thin 51 mm section of 32948XUUTG is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 240 mm bore smears the roller ends against the rib.
- Minimum load matters at high speed: an unloaded 32948XUUTG at a large fraction of 940 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded pair arrangements.
- Never fit the 240 mm cone by hammering the 320 mm cup: force for both press fits goes through the ring faces only, or brinell marks release as noise within the first running hours.
- Open 32948XUUTG units have no seals: a wheel-hub or gearbox application needs external sealing or the 940 r/min grease figure is meaningless once water reaches the cone rib.
- The 625/1000 kN ratings and 90 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32948XUUTG (ISO 355 4EC); 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 32948XUUTG?
32948XUUTG is a metric 4T tapered roller bearing to ISO 355: 240 mm bore, 320 mm outside diameter and 51 mm assembled width T (9.449 × 12.598 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 625 kN, C0 1000 kN, Pu 90 kN, grease limiting speed 940 r/min, oil speed 1,300 r/min, mass about 10900 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32948XUUTG?
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 (32948XUUTG); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32948XUUTG designation encode the 240 mm bore and what is 4EC?
last two digits 48 are the ISO bore code, ×5 = 240 mm (codes 00–03 use the 10/12/15/17 exception table). The 320 mm OD and 51 mm assembled T follow the ISO 355 dimension-series plan. 4EC is the maker-neutral ISO 355 abbreviation for this dimension series (the same code other manufacturers print); 4T is NTN's own brand mark.
Why does 32948XUUTG list two speeds, 940 and 1,300 r/min?
The lower figure, 940 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32948XUUTG at 1,300 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32948XUUTG mean?
Suffix reading on 32948XUUTG: the XUUTG suffix marks the ULTAGE specification for large NTN tapered rollers — upgraded material and internal design for longer life inside the unchanged ISO 355 envelope; XU combines the X ISO boundary section with the U uprated internal design; 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.