32924XU bearing: complete specifications & equivalents
The 32924XU is a ISO 355 radial bearing sized 120 x 165 x 29 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 120 mm |
| Outer diameter D | 165 mm |
| Width B | 29 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 180 kN |
| Basic static load rating C0 | 294 kN |
| Fatigue load limit Pu | 32 kN |
| Limiting speed (mechanical) | 2000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1760 g |
| Manufacturer designation | NTN 32924XU |
| 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 | 4.724 in |
|---|---|
| Outer diameter D | 6.496 in |
| Width B | 1.142 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 22.5 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) | 17 of 37 |
| Bore above smallest 32900-series size | 85 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32924XU | 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 32924XU model number is decoded
32924XU is a metric single-row tapered roller bearing in the NTN 4T programme: a pressed-steel cage guides profiled rollers between a separable cone and cup on the 120×165 mm ISO 355 envelope, with 29 mm overall assembled width T. On the NTN nameplate the parts carry 4T plus the bare code, while 2203E orders 32924XU by the metric ISO 355 number (ISO series abbreviation 2CC): 120 mm bore, 165 mm OD. At 180 kN C the bearing offers about 1.5 kN of dynamic capacity per millimetre of the 120 mm bore — compare any substitution on this ratio and the 29 mm assembled T, not on bore alone. Speed planning uses both catalogue columns: grease 2,000 r/min is the cage/rib mechanical ceiling for 32924XU, oil 2,600 r/min is available with circulating oil — a 600 r/min margin at this size. Fillet radii must clear the ring chamfers of the 165 mm cup and 120 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
- 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
- rolling-contact fatigue after the catalogue L10 life at the actual combined load
Selection pitfalls — read before you substitute
- At 120 mm bore the 32924XU 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 180 kN C level.
- The thin 29 mm section of 32924XU is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 120 mm bore smears the roller ends against the rib.
- ISO 355 makes the 120×165 mm envelope interchangeable but not the ratings: NTN prints 180/294 kN for this execution, and a cheaper same-number part can differ in roller complement and steel.
- On slash-size and T-code bearings confirm the full code on both cone and cup before fitting: the 120 mm bore alone does not identify the cup, and a mismatched cone/cup set has no catalogue rating.
- Open 32924XU units have no seals: a wheel-hub or gearbox application needs external sealing or the 2,000 r/min grease figure is meaningless once water reaches the cone rib.
- The 180/294 kN ratings and 32 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32924XU (ISO 355 2CC); 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 32924XU?
32924XU is a metric 4T tapered roller bearing to ISO 355: 120 mm bore, 165 mm outside diameter and 29 mm assembled width T (4.724 × 6.496 × 1.142 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 180 kN, C0 294 kN, Pu 32 kN, grease limiting speed 2,000 r/min, oil speed 2,600 r/min, mass about 1760 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32924XU?
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 (32924XU); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32924XU designation encode the 120 mm bore and what is 2CC?
last two digits 24 are the ISO bore code, ×5 = 120 mm (codes 00–03 use the 10/12/15/17 exception table). The 165 mm OD and 29 mm assembled T follow the ISO 355 dimension-series plan. 2CC 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 32924XU list two speeds, 2,000 and 2,600 r/min?
The lower figure, 2,000 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32924XU at 2,600 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32924XU mean?
Suffix reading on 32924XU: XU combines the X ISO boundary section with the U uprated internal design; U marks the reinforced/uprated internal design of the bare number, a separate order number with higher load capacity than the basic execution; 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.