33026U bearing: complete specifications & equivalents
The 33026U is a ISO 355 radial bearing sized 130 x 200 x 55 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 | 200 mm |
| Width B | 55 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 415 kN |
| Basic static load rating C0 | 660 kN |
| Fatigue load limit Pu | 69.5 kN |
| Limiting speed (mechanical) | 1700 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 6090 g |
| Manufacturer designation | NTN 33026U |
| 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 & 33000-series range
| Bore d | 5.118 in |
|---|---|
| Outer diameter D | 7.874 in |
| Width B | 2.165 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 35 mm |
| Smallest bore in 33000-series | 25 mm |
| Largest outer diameter in 33000-series | 225 mm |
| Width range across 33000-series | 17–59 mm |
| Bore position in 33000-series (smallest first) | 22 of 24 |
| Bore above smallest 33000-series size | 105 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33026U | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
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 33026U model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the NTN order number 33026U denotes the slim 33000 family of metric tapered roller bearings, 130 mm bore, 200 mm outside diameter and 55 mm assembled width T (5.118 × 7.874 × 2.165 in) to the ISO 355 boundary plan. The last two digits 26 are the ISO bore code, ×5 = 130 mm (codes 00–03 use the 10/12/15/17 exception table) under the ISO 355 numbering; the 55 mm value printed here is T, the width of the fully assembled cone-plus-cup set, not the inner-ring width alone. The 35.0 mm radial section carries the roller complement across the 130–200 mm envelope; section and contact angle differ between NTN metric families even at the same bore, so 302/322/323 are not drop-in swaps. Grease relubrication at 1,700 r/min limiting speed targets the rib contact; if the drive needs 2,300 r/min it must be arranged for oil lubrication with a defined flow to the large roller ends. Fillet radii must clear the ring chamfers of the 200 mm cup and 130 mm cone; use undercut shoulders so the rings seat fully rather than bridging on a shaft radius.
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
- cone-raceway spalling at the large rib when preload is set too high for the lubricant film
- 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 fatigue when the pair is run continuously near the grease limiting speed without oil cooling
- edge loading when shaft deflection exceeds the few arc-minutes of misalignment the adjusted pair allows
Selection pitfalls — read before you substitute
- At 130 mm bore the 33026U 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 415 kN C level.
- The thin 55 mm section of 33026U 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.
- ISO 355 makes the 130×200 mm envelope interchangeable but not the ratings: NTN prints 415/660 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 130 mm bore alone does not identify the cup, and a mismatched cone/cup set has no catalogue rating.
- The U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering 33026U by size alone can deliver the wrong contact-angle execution for a pinion position.
- The 415/660 kN ratings and 69.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 33026U (ISO 355 2FE); 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 33026U?
33026U is a metric 4T tapered roller bearing to ISO 355: 130 mm bore, 200 mm outside diameter and 55 mm assembled width T (5.118 × 7.874 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 415 kN, C0 660 kN, Pu 69.5 kN, grease limiting speed 1,700 r/min, oil speed 2,300 r/min, mass about 6090 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 33026U?
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 (33026U); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 33026U designation encode the 130 mm bore and what is 2FE?
last two digits 26 are the ISO bore code, ×5 = 130 mm (codes 00–03 use the 10/12/15/17 exception table). The 200 mm OD and 55 mm assembled T follow the ISO 355 dimension-series plan. 2FE 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 33026U list two speeds, 1,700 and 2,300 r/min?
The lower figure, 1,700 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 33026U at 2,300 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 33026U mean?
Suffix reading on 33026U: 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.