32214U bearing: complete specifications & equivalents
The 32214U is a ISO 355 radial bearing sized 70 x 125 x 33.25 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 70 mm |
| Outer diameter D | 125 mm |
| Width B | 33.25 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 184 kN |
| Basic static load rating C0 | 220 kN |
| Fatigue load limit Pu | 26.8 kN |
| Limiting speed (mechanical) | 2900 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1680 g |
| Manufacturer designation | NTN 32214U |
| 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 & 32200-series range
| Bore d | 2.756 in |
|---|---|
| Outer diameter D | 4.921 in |
| Width B | 1.309 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 27.5 mm |
| Smallest bore in 32200-series | 17 mm |
| Largest outer diameter in 32200-series | 580 mm |
| Width range across 32200-series | 17.25–159 mm |
| Bore position in 32200-series (smallest first) | 13 of 36 |
| Bore above smallest 32200-series size | 53 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32214U | 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 32214U model number is decoded
The NTN 2203E table prints 32214U in the heavy-section 32200 family: 70 mm bore, 125 mm cup OD, 33.25 mm T, with a grease limiting speed of 2,900 r/min and an oil-lubricated ceiling of 3,900 r/min. NTN also quotes this bearing with its ISO 355 dimension-series abbreviation, 3EC, which is the maker-neutral cross-reference for the 70×125 mm envelope; 4T is NTN's own tapered-roller brand mark on the parts. The pressed-steel cage and surface-finished roller ends are standard 4T execution; ULTAGE-marked variants use upgraded material and internal geometry aimed at longer rating life with the same ISO 355 envelope. Grease relubrication at 2,900 r/min limiting speed targets the rib contact; if the drive needs 3,900 r/min it must be arranged for oil lubrication with a defined flow to the large roller ends. After mounting check the contact pattern with marking blue: a pattern biased to the large or small roller end means the 70 mm pair is misadjusted and the 33.25 mm T set will edge-load in service.
Typical equipment & failure modes
Common applications
- large agricultural and forestry machine axles
- heavy industrial gearboxes and crane travel drives
- rolling-mill auxiliary and pinion-stand shafts
- large conveyor and bucket-elevator pulleys
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 damage from a mounting blow delivered through the roller complement instead of the ring face
- fretting corrosion on a loose cone seat that creeps under rotating load
Selection pitfalls — read before you substitute
- Mount the 70 mm cone by induction heating (max 120 °C) and the cup with a press sleeve; the 1680 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
- The heavy-section 32200 family at 70 mm bore (125×33.25 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 3,900 r/min oil ceiling.
- Minimum load matters at high speed: an unloaded 32214U at a large fraction of 2,900 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded pair arrangements.
- The U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering 32214U by size alone can deliver the wrong contact-angle execution for a pinion position.
- Replacing one half of an adjusted pair without resetting end play negates the 33.25 mm T dimension logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- The 184/220 kN ratings and 26.8 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32214U (ISO 355 3EC); 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 32214U?
32214U is a metric 4T tapered roller bearing to ISO 355: 70 mm bore, 125 mm outside diameter and 33.25 mm assembled width T (2.756 × 4.921 × 1.309 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 184 kN, C0 220 kN, Pu 26.8 kN, grease limiting speed 2,900 r/min, oil speed 3,900 r/min, mass about 1680 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32214U?
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 (32214U); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32214U designation encode the 70 mm bore and what is 3EC?
last two digits 14 are the ISO bore code, ×5 = 70 mm (codes 00–03 use the 10/12/15/17 exception table). The 125 mm OD and 33.25 mm assembled T follow the ISO 355 dimension-series plan. 3EC 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 32214U list two speeds, 2,900 and 3,900 r/min?
The lower figure, 2,900 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32214U at 3,900 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32214U mean?
Suffix reading on 32214U: 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.