33122UE1 bearing: complete specifications & equivalents
The 33122UE1 is a ISO 355 radial bearing sized 110 x 180 x 56 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 110 mm |
| Outer diameter D | 180 mm |
| Width B | 56 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 400 kN |
| Basic static load rating C0 | 610 kN |
| Fatigue load limit Pu | 66.5 kN |
| Limiting speed (mechanical) | 1900 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 5520 g |
| Manufacturer designation | NTN 33122UE1 |
| 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 & 33100-series range
| Bore d | 4.331 in |
|---|---|
| Outer diameter D | 7.087 in |
| Width B | 2.205 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 35 mm |
| Smallest bore in 33100-series | 40 mm |
| Largest outer diameter in 33100-series | 200 mm |
| Width range across 33100-series | 26–62 mm |
| Bore position in 33100-series (smallest first) | 12 of 13 |
| Bore above smallest 33100-series size | 70 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33122UE1 | 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 33122UE1 model number is decoded
For a 110 mm shaft with a thrust component, NTN lists 33122UE1, a metric 4T tapered roller bearing of 400 kN C and 610 kN C0 inside the 180 mm OD, 56 mm-wide assembled set. Reading the designation: the leading five digits follow the ISO 355 metric plan (dimension family plus two-digit bore code), and 33122UE1 resolves to 110 mm bore; the NTN factory mark 4T is stamped on cone and cup but is a brand mark, not a size code, so the catalogue sku is printed without it. At 400 kN C the bearing offers about 3.6 kN of dynamic capacity per millimetre of the 110 mm bore — compare any substitution on this ratio and the 56 mm assembled T, not on bore alone. The 35.0 mm section height over the 110 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. When pairing 33122UE1 with a second tapered bearing, keep the matched arrangement clean: a single stray grit particle between cup and housing changes preload faster than the adjustment range can correct.
Typical equipment & failure modes
Common applications
- mineral-processing feeder and crusher auxiliaries
- marine winch and deck-machinery shafts
- paper-machine press-section rolls
- large agricultural and forestry machine axles
Known failure patterns
- cone-raceway spalling at the large rib when preload is set too high for the lubricant film
- flaking on one cone only when a back-to-back / face-to-face pair is loaded unevenly by a bent shaft
- smearing on the roller large ends and cone rib after a dry start with preload but no oil film
- 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
- Mount the 110 mm cone by induction heating (max 120 °C) and the cup with a press sleeve; the 5520 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
- The light-wide 33100 family at 110 mm bore (180×56 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 2,600 r/min oil ceiling.
- The 35.0 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 33122UE1 or the ring will bottom out on the radius instead of the shoulder face.
- ISO 355 makes the 110×180 mm envelope interchangeable but not the ratings: NTN prints 400/610 kN for this execution, and a cheaper same-number part can differ in roller complement and steel.
- Open 33122UE1 units have no seals: a wheel-hub or gearbox application needs external sealing or the 1,900 r/min grease figure is meaningless once water reaches the cone rib.
- The 400/610 kN ratings and 66.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 33122UE1 (ISO 355 3FE); 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 33122UE1?
33122UE1 is a metric 4T tapered roller bearing to ISO 355: 110 mm bore, 180 mm outside diameter and 56 mm assembled width T (4.331 × 7.087 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 400 kN, C0 610 kN, Pu 66.5 kN, grease limiting speed 1,900 r/min, oil speed 2,600 r/min, mass about 5520 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 33122UE1?
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 (33122UE1); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 33122UE1 designation encode the 110 mm bore and what is 3FE?
last two digits E1 are the ISO bore code, ×5 = 110 mm (codes 00–03 use the 10/12/15/17 exception table). The 180 mm OD and 56 mm assembled T follow the ISO 355 dimension-series plan. 3FE 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 33122UE1 list two speeds, 1,900 and 2,600 r/min?
The lower figure, 1,900 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 33122UE1 at 2,600 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 33122UE1 mean?
Suffix reading on 33122UE1: 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.