32024XU bearing: complete specifications & equivalents
The 32024XU is a ISO 355 radial bearing sized 120 x 180 x 38 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 | 180 mm |
| Width B | 38 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 272 kN |
| Basic static load rating C0 | 420 kN |
| Fatigue load limit Pu | 45.5 kN |
| Limiting speed (mechanical) | 1800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 3290 g |
| Manufacturer designation | NTN 32024XU |
| 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 & 32000-series range
| Bore d | 4.724 in |
|---|---|
| Outer diameter D | 7.087 in |
| Width B | 1.496 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 30 mm |
| Smallest bore in 32000-series | 20 mm |
| Largest outer diameter in 32000-series | 650 mm |
| Width range across 32000-series | 15–130 mm |
| Bore position in 32000-series (smallest first) | 23 of 43 |
| Bore above smallest 32000-series size | 100 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32024XU | 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 32024XU model number is decoded
32024XU belongs to the NTN metric 4T tapered roller range (low-section 32000 family tuned for low friction); the open bearing leaves sealing to the application and is normally ordered and mounted as an adjustable matched pair. On the NTN nameplate the parts carry 4T plus the bare code, while 2203E orders 32024XU by the metric ISO 355 number (ISO series abbreviation 4DC): 120 mm bore, 180 mm OD. 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 32024XU, since running clearance is set during assembly. The two speed columns differ by a factor of .72 (grease/limiting 1,800 vs oil 2,500 r/min); heat generation at the cone rib decides which lubrication a real 32024XU arrangement can sustain. Re-adjustment after bedding-in is standard practice: re-check end play once the paired 32024XU arrangement has run in, because initial seat seating relaxes the set preload slightly.
Typical equipment & failure modes
Common applications
- offshore crane and drawworks drums
- heavy haul railway traction gearboxes
- large marine propulsion reduction gears
- cement-plant kiln and mill drive trains
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
- brinell marks on cone and cup raceways from impact during handling or hammering during fitting
Selection pitfalls — read before you substitute
- At 120 mm bore the 32024XU 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 272 kN C level.
- The thin 38 mm section of 32024XU 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.
- Grease packs must leave free volume in the 38 mm-wide set; over-greasing a paired bearing churning at the 2,500 r/min oil-band speed raises temperature and destroys the preload setting.
- Do not confuse T (38 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.
- 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.
- The 272/420 kN ratings and 45.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32024XU (ISO 355 4DC); 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 32024XU?
32024XU is a metric 4T tapered roller bearing to ISO 355: 120 mm bore, 180 mm outside diameter and 38 mm assembled width T (4.724 × 7.087 × 1.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 272 kN, C0 420 kN, Pu 45.5 kN, grease limiting speed 1,800 r/min, oil speed 2,500 r/min, mass about 3290 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32024XU?
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 (32024XU); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32024XU designation encode the 120 mm bore and what is 4DC?
last two digits 24 are the ISO bore code, ×5 = 120 mm (codes 00–03 use the 10/12/15/17 exception table). The 180 mm OD and 38 mm assembled T follow the ISO 355 dimension-series plan. 4DC 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 32024XU list two speeds, 1,800 and 2,500 r/min?
The lower figure, 1,800 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32024XU at 2,500 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32024XU mean?
Suffix reading on 32024XU: 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.