33217U bearing: complete specifications & equivalents
The 33217U is a ISO 355 radial bearing sized 85 x 150 x 49 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 | 150 mm |
| Width B | 49 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 315 kN |
| Basic static load rating C0 | 420 kN |
| Fatigue load limit Pu | 49 kN |
| Limiting speed (mechanical) | 2400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 3610 g |
| Manufacturer designation | NTN 33217U |
| 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 & 33200-series range
| Bore d | 3.346 in |
|---|---|
| Outer diameter D | 5.906 in |
| Width B | 1.929 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 32.5 mm |
| Smallest bore in 33200-series | 25 mm |
| Largest outer diameter in 33200-series | 180 mm |
| Width range across 33200-series | 22–63 mm |
| Bore position in 33200-series (smallest first) | 15 of 18 |
| Bore above smallest 33200-series size | 60 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33217U | 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 33217U model number is decoded
For a 85 mm shaft with a thrust component, NTN lists 33217U, a metric 4T tapered roller bearing of 315 kN C and 420 kN C0 inside the 150 mm OD, 49 mm-wide assembled set. On the NTN nameplate the parts carry 4T plus the bare code, while 2203E orders 33217U by the metric ISO 355 number (ISO series abbreviation 3EE): 85 mm bore, 150 mm OD. At 315 kN C the bearing offers about 3.7 kN of dynamic capacity per millimetre of the 85 mm bore — compare any substitution on this ratio and the 49 mm assembled T, not on bore alone. Imperial cross-check for the drawing: 85×150×49 mm is 3.346 × 5.906 × 1.929 in; ISO 355 makes the envelope interchangeable but C/C0, 315/420 kN, is NTN-specific. Open 4T bearings need application seals; without them the grease at the cone rib of 33217U washes out and the rib/roller-end contact smears on the first wet or dusty shift.
Typical equipment & failure modes
Common applications
- marine winch and deck-machinery shafts
- paper-machine press-section rolls
- large agricultural and forestry machine axles
- heavy industrial gearboxes and crane travel drives
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 damage from a mounting blow delivered through the roller complement instead of the ring face
- brinell marks on cone and cup raceways from impact during handling or hammering during fitting
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 3610 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
- The medium-wide 33200 family at 85 mm bore (150×49 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 3,200 r/min oil ceiling.
- ISO 355 makes the 85×150 mm envelope interchangeable but not the ratings: NTN prints 315/420 kN for this execution, and a cheaper same-number part can differ in roller complement and steel.
- ISO 355 makes the 85×150 mm envelope interchangeable but not the ratings: NTN prints 315/420 kN for this execution, and a cheaper same-number part can differ in roller complement and steel.
- Open 33217U units have no seals: a wheel-hub or gearbox application needs external sealing or the 2,400 r/min grease figure is meaningless once water reaches the cone rib.
- The 315/420 kN ratings and 49 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 33217U (ISO 355 3EE); 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 33217U?
33217U is a metric 4T tapered roller bearing to ISO 355: 85 mm bore, 150 mm outside diameter and 49 mm assembled width T (3.346 × 5.906 × 1.929 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 315 kN, C0 420 kN, Pu 49 kN, grease limiting speed 2,400 r/min, oil speed 3,200 r/min, mass about 3610 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 33217U?
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 (33217U); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 33217U designation encode the 85 mm bore and what is 3EE?
last two digits 17 are the ISO bore code, ×5 = 85 mm (codes 00–03 use the 10/12/15/17 exception table). The 150 mm OD and 49 mm assembled T follow the ISO 355 dimension-series plan. 3EE 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 33217U list two speeds, 2,400 and 3,200 r/min?
The lower figure, 2,400 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 33217U at 3,200 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 33217U mean?
Suffix reading on 33217U: 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.