33117U bearing: complete specifications & equivalents
The 33117U is a ISO 355 radial bearing sized 85 x 140 x 41 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 85 mm |
| Outer diameter D | 140 mm |
| Width B | 41 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 234 kN |
| Basic static load rating C0 | 330 kN |
| Fatigue load limit Pu | 39 kN |
| Limiting speed (mechanical) | 2500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2440 g |
| Manufacturer designation | NTN 33117U |
| 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 | 3.346 in |
|---|---|
| Outer diameter D | 5.512 in |
| Width B | 1.614 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 27.5 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) | 10 of 13 |
| Bore above smallest 33100-series size | 45 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33117U | 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 33117U model number is decoded
33117U 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 85×140 mm ISO 355 envelope, with 41 mm overall assembled width T. NTN also quotes this bearing with its ISO 355 dimension-series abbreviation, 3DE, which is the maker-neutral cross-reference for the 85×140 mm envelope; 4T is NTN's own tapered-roller brand mark on the parts. 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 33117U, since running clearance is set during assembly. Grease relubrication at 2,500 r/min limiting speed targets the rib contact; if the drive needs 3,400 r/min it must be arranged for oil lubrication with a defined flow to the large roller ends. Re-adjustment after bedding-in is standard practice: re-check end play once the paired 33117U arrangement has run in, because initial seat seating relaxes the set preload slightly.
Typical equipment & failure modes
Common applications
- paper-machine press-section rolls
- large agricultural and forestry machine axles
- heavy industrial gearboxes and crane travel drives
- rolling-mill auxiliary and pinion-stand shafts
Known failure patterns
- cup creep and housing fretting when the specified outer-ring press fit is not achieved
- 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
- fretting corrosion on a loose cone seat that creeps under rotating load
Selection pitfalls — read before you substitute
- Mount the 85 mm cone by induction heating (max 120 °C) and the cup with a press sleeve; the 2440 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
- The light-wide 33100 family at 85 mm bore (140×41 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 3,400 r/min oil ceiling.
- Open 33117U units have no seals: a wheel-hub or gearbox application needs external sealing or the 2,500 r/min grease figure is meaningless once water reaches the cone rib.
- Back-to-back and face-to-face arrangements react differently to shaft bending: pick the pair orientation for the moment load before locking the 85 mm shoulder geometry, because retrofitting flips the cups.
- On slash-size and T-code bearings confirm the full code on both cone and cup before fitting: the 85 mm bore alone does not identify the cup, and a mismatched cone/cup set has no catalogue rating.
- The 234/330 kN ratings and 39 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 33117U (ISO 355 3DE); 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 33117U?
33117U is a metric 4T tapered roller bearing to ISO 355: 85 mm bore, 140 mm outside diameter and 41 mm assembled width T (3.346 × 5.512 × 1.614 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 234 kN, C0 330 kN, Pu 39 kN, grease limiting speed 2,500 r/min, oil speed 3,400 r/min, mass about 2440 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 33117U?
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 (33117U); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 33117U designation encode the 85 mm bore and what is 3DE?
last two digits 17 are the ISO bore code, ×5 = 85 mm (codes 00–03 use the 10/12/15/17 exception table). The 140 mm OD and 41 mm assembled T follow the ISO 355 dimension-series plan. 3DE 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 33117U list two speeds, 2,500 and 3,400 r/min?
The lower figure, 2,500 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 33117U at 3,400 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 33117U mean?
Suffix reading on 33117U: 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.