32032XU bearing: complete specifications & equivalents
The 32032XU is a ISO 355 radial bearing sized 160 x 240 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 | 160 mm |
| Outer diameter D | 240 mm |
| Width B | 51 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 485 kN |
| Basic static load rating C0 | 790 kN |
| Fatigue load limit Pu | 78.5 kN |
| Limiting speed (mechanical) | 1400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 7860 g |
| Manufacturer designation | NTN 32032XU |
| 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 | 6.299 in |
|---|---|
| Outer diameter D | 9.449 in |
| Width B | 2.008 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 40 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) | 27 of 43 |
| Bore above smallest 32000-series size | 140 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32032XU | 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 32032XU model number is decoded
32032XU 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 160×240 mm ISO 355 envelope, with 51 mm overall assembled width T. On the NTN nameplate the parts carry 4T plus the bare code, while 2203E orders 32032XU by the metric ISO 355 number (ISO series abbreviation 4EC): 160 mm bore, 240 mm OD. Suffix reading on 32032XU: 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. The 40.0 mm section height over the 160 mm bore positions the load centre; axial location of the pair depends on that contact line, so spacer faces must be square within the P0 tolerance of the bearing. Mount the 160 mm-bore cone on the shaft first (induction heat, max 120 °C), fit the cup square in its housing, then set preload or end play; never drive the cup home through the rollers of 32032XU.
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
- cone-raceway spalling at the large rib when preload is set too high for the lubricant film
- preload loss from racewear when one bearing of the paired set is replaced without re-adjusting end play
- rib scoring when axial load is carried beyond the cone rib capacity of the adjusted pair
- 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 160 mm bore the 32032XU 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 485 kN C level.
- The thin 51 mm section of 32032XU is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 160 mm bore smears the roller ends against the rib.
- Never fit the 160 mm cone by hammering the 240 mm cup: force for both press fits goes through the ring faces only, or brinell marks release as noise within the first running hours.
- The U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering 32032XU by size alone can deliver the wrong contact-angle execution for a pinion position.
- ISO 355 makes the 160×240 mm envelope interchangeable but not the ratings: NTN prints 485/790 kN for this execution, and a cheaper same-number part can differ in roller complement and steel.
- The 485/790 kN ratings and 78.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32032XU (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 32032XU?
32032XU is a metric 4T tapered roller bearing to ISO 355: 160 mm bore, 240 mm outside diameter and 51 mm assembled width T (6.299 × 9.449 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 485 kN, C0 790 kN, Pu 78.5 kN, grease limiting speed 1,400 r/min, oil speed 1,800 r/min, mass about 7860 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32032XU?
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 (32032XU); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32032XU designation encode the 160 mm bore and what is 4EC?
last two digits 32 are the ISO bore code, ×5 = 160 mm (codes 00–03 use the 10/12/15/17 exception table). The 240 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 32032XU list two speeds, 1,400 and 1,800 r/min?
The lower figure, 1,400 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32032XU 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 32032XU mean?
Suffix reading on 32032XU: 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.