32212U bearing: complete specifications & equivalents
The 32212U is a ISO 355 radial bearing sized 60 x 110 x 29.75 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 60 mm |
| Outer diameter D | 110 mm |
| Width B | 29.75 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 144 kN |
| Basic static load rating C0 | 164 kN |
| Fatigue load limit Pu | 20.1 kN |
| Limiting speed (mechanical) | 3400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1180 g |
| Manufacturer designation | NTN 32212U |
| 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 | 2.362 in |
|---|---|
| Outer diameter D | 4.331 in |
| Width B | 1.171 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 25 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) | 11 of 36 |
| Bore above smallest 32200-series size | 43 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32212U | 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 32212U model number is decoded
For a 60 mm shaft with a thrust component, NTN lists 32212U, a metric 4T tapered roller bearing of 144 kN C and 164 kN C0 inside the 110 mm OD, 29.75 mm-wide assembled set. Digit by digit, the bare number identifies the heavy-section 32200 family and a bore code resolving to 60 mm; 110 mm OD and 29.75 mm assembled T are the matching ISO 355 boundary dimensions shared with other makers of the same dimension series. NTN grades 4T metric bearings as open bearings without integral seals; at 60 mm bore the application supplies the seals and the grease fill or oil supply to the 3EC ISO 355 assembly. Catalogue mass of the 32212U set is 1180 g (0.046 lb cone + cup); abutment and shaft shoulder design must carry that mass square to the axis. Re-adjustment after bedding-in is standard practice: re-check end play once the paired 32212U arrangement has run in, because initial seat seating relaxes the set preload slightly.
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
- pressed-steel cage pocket wear from roller skid at light radial load and high speed
- false brinelling on a stationary paired set exposed to external vibration
Selection pitfalls — read before you substitute
- Mount the 60 mm cone by induction heating (max 120 °C) and the cup with a press sleeve; the 1180 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
- The heavy-section 32200 family at 60 mm bore (110×29.75 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 4,500 r/min oil ceiling.
- Open 32212U units have no seals: a wheel-hub or gearbox application needs external sealing or the 3,400 r/min grease figure is meaningless once water reaches the cone rib.
- Never fit the 60 mm cone by hammering the 110 mm cup: force for both press fits goes through the ring faces only, or brinell marks release as noise within the first running hours.
- The 25.0 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 32212U or the ring will bottom out on the radius instead of the shoulder face.
- The 144/164 kN ratings and 20.1 kN Pu here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32212U (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 32212U?
32212U is a metric 4T tapered roller bearing to ISO 355: 60 mm bore, 110 mm outside diameter and 29.75 mm assembled width T (2.362 × 4.331 × 1.171 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 144 kN, C0 164 kN, Pu 20.1 kN, grease limiting speed 3,400 r/min, oil speed 4,500 r/min, mass about 1180 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32212U?
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 (32212U); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32212U designation encode the 60 mm bore and what is 3EC?
last two digits 12 are the ISO bore code, ×5 = 60 mm (codes 00–03 use the 10/12/15/17 exception table). The 110 mm OD and 29.75 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 32212U list two speeds, 3,400 and 4,500 r/min?
The lower figure, 3,400 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32212U at 4,500 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32212U mean?
Suffix reading on 32212U: 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.