32926XU bearing: complete specifications & equivalents
The 32926XU is a ISO 355 radial bearing sized 130 x 180 x 32 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 130 mm |
| Outer diameter D | 180 mm |
| Width B | 32 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 215 kN |
| Basic static load rating C0 | 350 kN |
| Fatigue load limit Pu | 37.5 kN |
| Limiting speed (mechanical) | 1800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2410 g |
| Manufacturer designation | NTN 32926XU |
| 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 | 5.118 in |
|---|---|
| Outer diameter D | 7.087 in |
| Width B | 1.26 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 25 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) | 18 of 37 |
| Bore above smallest 32900-series size | 95 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32926XU | 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 32926XU model number is decoded
32926XU belongs to the NTN metric 4T tapered roller range (extra-light thin-section 32900 family); the open bearing leaves sealing to the application and is normally ordered and mounted as an adjustable matched pair. Digit by digit, the bare number identifies the extra-light thin-section 32900 family and a bore code resolving to 130 mm; 180 mm OD and 32 mm assembled T are the matching ISO 355 boundary dimensions shared with other makers of the same dimension series. 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 32926XU, since running clearance is set during assembly. The two speed columns differ by a factor of .75 (grease/limiting 1,800 vs oil 2,400 r/min); heat generation at the cone rib decides which lubrication a real 32926XU arrangement can sustain. Mount the 130 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 32926XU.
Typical equipment & failure modes
Common applications
- large marine propulsion reduction gears
- cement-plant kiln and mill drive trains
- rolling-mill roll-neck and gearbox positions
- large crusher and SAG/AG-mill drive shafts
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
- cage damage from a mounting blow delivered through the roller complement instead of the ring face
- false brinelling on a stationary paired set exposed to external vibration
Selection pitfalls — read before you substitute
- At 130 mm bore the 32926XU 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 215 kN C level.
- The thin 32 mm section of 32926XU is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 130 mm bore smears the roller ends against the rib.
- Replacing one half of an adjusted pair without resetting end play negates the 32 mm T dimension logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- Open 32926XU units have no seals: a wheel-hub or gearbox application needs external sealing or the 1,800 r/min grease figure is meaningless once water reaches the cone rib.
- On slash-size and T-code bearings confirm the full code on both cone and cup before fitting: the 130 mm bore alone does not identify the cup, and a mismatched cone/cup set has no catalogue rating.
- The 215/350 kN ratings and 37.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32926XU (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 32926XU?
32926XU is a metric 4T tapered roller bearing to ISO 355: 130 mm bore, 180 mm outside diameter and 32 mm assembled width T (5.118 × 7.087 × 1.26 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 215 kN, C0 350 kN, Pu 37.5 kN, grease limiting speed 1,800 r/min, oil speed 2,400 r/min, mass about 2410 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32926XU?
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 (32926XU); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32926XU designation encode the 130 mm bore and what is 2CC?
last two digits 26 are the ISO bore code, ×5 = 130 mm (codes 00–03 use the 10/12/15/17 exception table). The 180 mm OD and 32 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 32926XU list two speeds, 1,800 and 2,400 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 32926XU at 2,400 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32926XU mean?
Suffix reading on 32926XU: 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.