32011X bearing: complete specifications & equivalents
The 32011X is a ISO 355 radial bearing sized 55 x 90 x 23 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 55 mm |
| Outer diameter D | 90 mm |
| Width B | 23 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 89 kN |
| Basic static load rating C0 | 118 kN |
| Limiting speed (mechanical) | 4000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 560 g |
| Manufacturer designation | NTN 32011X |
| 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 | 2.165 in |
|---|---|
| Outer diameter D | 3.543 in |
| Width B | 0.906 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 17.5 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) | 11 of 43 |
| Bore above smallest 32000-series size | 35 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32011X-DF | SKF | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue. |
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 32011X model number is decoded
NTN supplies this 55 mm bore tapered roller position as 32011X: one cone assembly, one cup, line-contact rollers and a steel cage, rated 89 kN basic dynamic and 118 kN static on the low-section 32000 family tuned for low friction. Digit by digit, the bare number identifies the low-section 32000 family tuned for low friction and a bore code resolving to 55 mm; 90 mm OD and 23 mm assembled T are the matching ISO 355 boundary dimensions shared with other makers of the same dimension series. At 89 kN C the bearing offers about 1.6 kN of dynamic capacity per millimetre of the 55 mm bore — compare any substitution on this ratio and the 23 mm assembled T, not on bore alone. Selection: C 89 kN against C0 118 kN gives a C0/C ratio of 1.33 for the 55 mm bore, and the equivalent combined load must keep below the rating at the target L10 with the pair counted as one unit. Re-adjustment after bedding-in is standard practice: re-check end play once the paired 32011X arrangement has run in, because initial seat seating relaxes the set preload slightly.
Typical equipment & failure modes
Common applications
- pump and compressor drive shafts carrying combined load
- machine-tool gearbox and headstock shafts
- axle final-drive and differential positions
- construction-equipment wheel and pivot hubs
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 fatigue when the pair is run continuously near the grease limiting speed without oil cooling
- rolling-contact fatigue after the catalogue L10 life at the actual combined load
Selection pitfalls — read before you substitute
- Hub and pinion bearings of this 55 mm bore class are commonly adjusted in pairs; verify end play against the axle drawing and re-torque after bedding-in rather than trusting the initial preload on 32011X.
- The thin 23 mm section of 32011X is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 55 mm bore smears the roller ends against the rib.
- The U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering 32011X by size alone can deliver the wrong contact-angle execution for a pinion position.
- The U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering 32011X by size alone can deliver the wrong contact-angle execution for a pinion position.
- Open 32011X units have no seals: a wheel-hub or gearbox application needs external sealing or the 4,000 r/min grease figure is meaningless once water reaches the cone rib.
- The 89/118 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32011X (ISO 355 3CC); 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 32011X?
32011X is a metric 4T tapered roller bearing to ISO 355: 55 mm bore, 90 mm outside diameter and 23 mm assembled width T (2.165 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 89 kN, C0 118 kN (2203E prints no Pu for this size), grease limiting speed 4,000 r/min, oil speed 5,400 r/min, mass about 560 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32011X?
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 (32011X); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32011X designation encode the 55 mm bore and what is 3CC?
last two digits 11 are the ISO bore code, ×5 = 55 mm (codes 00–03 use the 10/12/15/17 exception table). The 90 mm OD and 23 mm assembled T follow the ISO 355 dimension-series plan. 3CC 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 32011X list two speeds, 4,000 and 5,400 r/min?
The lower figure, 4,000 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32011X at 5,400 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32011X mean?
Suffix reading on 32011X: X marks the execution built to the ISO boundary-dimension section (interchangeable envelope, NTN internal geometry); 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.