33216U bearing: complete specifications & equivalents
The 33216U is a ISO 355 radial bearing sized 80 x 140 x 46 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 80 mm |
| Outer diameter D | 140 mm |
| Width B | 46 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 278 kN |
| Basic static load rating C0 | 365 kN |
| Fatigue load limit Pu | 43.5 kN |
| Limiting speed (mechanical) | 2500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 2940 g |
| Manufacturer designation | NTN 33216U |
| 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 | 3.15 in |
|---|---|
| Outer diameter D | 5.512 in |
| Width B | 1.811 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 30 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) | 14 of 18 |
| Bore above smallest 33200-series size | 55 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33216U | 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 33216U model number is decoded
NTN supplies this 80 mm bore tapered roller position as 33216U: one cone assembly, one cup, line-contact rollers and a steel cage, rated 278 kN basic dynamic and 365 kN static on the medium-wide 33200 family. Digit by digit, the bare number identifies the medium-wide 33200 family and a bore code resolving to 80 mm; 140 mm OD and 46 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 33216U, since running clearance is set during assembly. The 3.5 kN-per-mm-bore capacity figure for 33216U summarises the 278 kN rating over 80 mm bore; use it to sanity-check an interchange candidate before swapping brands. After mounting check the contact pattern with marking blue: a pattern biased to the large or small roller end means the 80 mm pair is misadjusted and the 46 mm T set will edge-load in service.
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
- cup creep and housing fretting when the specified outer-ring press fit is not achieved
- 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
- false brinelling on a stationary paired set exposed to external vibration
Selection pitfalls — read before you substitute
- Mount the 80 mm cone by induction heating (max 120 °C) and the cup with a press sleeve; the 2940 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
- The medium-wide 33200 family at 80 mm bore (140×46 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.
- The 30.0 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 33216U or the ring will bottom out on the radius instead of the shoulder face.
- Do not confuse T (46 mm assembled width of cone + cup) with the cone width when drawing spacers; an abutment sized to T instead of the ring width leaves the cup unseated.
- On slash-size and T-code bearings confirm the full code on both cone and cup before fitting: the 80 mm bore alone does not identify the cup, and a mismatched cone/cup set has no catalogue rating.
- The 278/365 kN ratings and 43.5 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 33216U (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 33216U?
33216U is a metric 4T tapered roller bearing to ISO 355: 80 mm bore, 140 mm outside diameter and 46 mm assembled width T (3.15 × 5.512 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 278 kN, C0 365 kN, Pu 43.5 kN, grease limiting speed 2,500 r/min, oil speed 3,400 r/min, mass about 2940 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 33216U?
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 (33216U); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 33216U designation encode the 80 mm bore and what is 3EE?
last two digits 16 are the ISO bore code, ×5 = 80 mm (codes 00–03 use the 10/12/15/17 exception table). The 140 mm OD and 46 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 33216U 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 33216U 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 33216U mean?
Suffix reading on 33216U: 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.