32012X bearing: complete specifications & equivalents
The 32012X is a ISO 355 radial bearing sized 60 x 95 x 23 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 | 95 mm |
| Width B | 23 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 91 kN |
| Basic static load rating C0 | 123 kN |
| Limiting speed (mechanical) | 3700 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 596 g |
| Manufacturer designation | NTN 32012X |
| 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 & 32000-series range
| Bore d | 2.362 in |
|---|---|
| Outer diameter D | 3.74 in |
| Width B | 0.906 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 17.5 mm |
| Smallest bore in 32000-series | 20 mm |
| Largest outer diameter in 32000-series | 650 mm |
| Width range across 32000-series | 15–130 mm |
| Bore position in 32000-series (smallest first) | 12 of 43 |
| Bore above smallest 32000-series size | 40 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32012X-DF | SKF | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue. |
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 32012X model number is decoded
For a 60 mm shaft with a thrust component, NTN lists 32012X, a metric 4T tapered roller bearing of 91 kN C and 123 kN C0 inside the 95 mm OD, 23 mm-wide assembled set. On the NTN nameplate the parts carry 4T plus the bare code, while 2203E orders 32012X by the metric ISO 355 number (ISO series abbreviation 4CC): 60 mm bore, 95 mm OD. The rollers run with their large ends against the cone's integral guide rib; the rib/end-flange contact carries the thrust component and is the reason lubricant must reach the rib face of 32012X, not only the raceway. Speed planning uses both catalogue columns: grease 3,700 r/min is the cage/rib mechanical ceiling for 32012X, oil 4,900 r/min is available with circulating oil — a 1,200 r/min margin at this size. With a rotating shaft a k5/m5 shaft seat and a press-fit cup are typical catalogue practice for 32012X; reverse the logic if the cup rotates, and re-verify against load direction and magnitude.
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
- cup creep and housing fretting when the specified outer-ring press fit is not achieved
- smearing on the roller large ends and cone rib after a dry start with preload but no oil film
- flaking on one cone only when a back-to-back / face-to-face pair is loaded unevenly by a bent shaft
- cage damage from a mounting blow delivered through the roller complement instead of the ring face
- edge loading when shaft deflection exceeds the few arc-minutes of misalignment the adjusted pair allows
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 596 g ring mass makes cocking during fitting a direct raceway-brinelling risk.
- The thin 23 mm section of 32012X is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 60 mm bore smears the roller ends against the rib.
- The 17.5 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 32012X or the ring will bottom out on the radius instead of the shoulder face.
- Grease packs must leave free volume in the 23 mm-wide set; over-greasing a paired bearing churning at the 4,900 r/min oil-band speed raises temperature and destroys the preload setting.
- Back-to-back and face-to-face arrangements react differently to shaft bending: pick the pair orientation for the moment load before locking the 60 mm shoulder geometry, because retrofitting flips the cups.
- The 91/123 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32012X (ISO 355 4CC); 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 32012X?
32012X is a metric 4T tapered roller bearing to ISO 355: 60 mm bore, 95 mm outside diameter and 23 mm assembled width T (2.362 × 3.74 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 91 kN, C0 123 kN (2203E prints no Pu for this size), grease limiting speed 3,700 r/min, oil speed 4,900 r/min, mass about 596 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32012X?
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 (32012X); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32012X designation encode the 60 mm bore and what is 4CC?
last two digits 12 are the ISO bore code, ×5 = 60 mm (codes 00–03 use the 10/12/15/17 exception table). The 95 mm OD and 23 mm assembled T follow the ISO 355 dimension-series plan. 4CC 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 32012X list two speeds, 3,700 and 4,900 r/min?
The lower figure, 3,700 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32012X at 4,900 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32012X mean?
Suffix reading on 32012X: X marks the execution built to the ISO boundary-dimension section (interchangeable envelope, NTN internal geometry); 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.