32209-NTN bearing: complete specifications & equivalents
The 32209-NTN is a ISO 355 radial bearing sized 45 x 85 x 24.75 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 45 mm |
| Outer diameter D | 85 mm |
| Width B | 24.75 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 | 100 kN |
| Limiting speed (mechanical) | 4400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 604 g |
| Manufacturer designation | NTN 32209 |
| 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 | 1.772 in |
|---|---|
| Outer diameter D | 3.346 in |
| Width B | 0.974 in |
| ISO bore code | 09 |
| Radial section height (D−d)/2 | 20 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) | 8 of 36 |
| Bore above smallest 32200-series size | 28 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32209 | FAG | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier. |
| 32209-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. |
| 32209-SKF | SKF | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier. |
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 32209-NTN model number is decoded
NTN supplies this 45 mm bore tapered roller position as 32209: one cone assembly, one cup, line-contact rollers and a steel cage, rated 91 kN basic dynamic and 100 kN static on the heavy-section 32200 family. On the NTN nameplate the parts carry 4T plus the bare code, while 2203E orders 32209 by the metric ISO 355 number (ISO series abbreviation 3DC): 45 mm bore, 85 mm OD. 2203E lists two speed ceilings for 32209: 4,400 r/min with grease lubrication (the limiting speed) and 5,900 r/min with oil, the higher oil value reflecting better heat removal from the cone rib. The two speed columns differ by a factor of .75 (grease/limiting 4,400 vs oil 5,900 r/min); heat generation at the cone rib decides which lubrication a real 32209 arrangement can sustain. Open 4T bearings need application seals; without them the grease at the cone rib of 32209 washes out and the rib/roller-end contact smears on the first wet or dusty shift.
Typical equipment & failure modes
Common applications
- pump and compressor drive shafts carrying combined load
- machine-tool gearbox and headstock shafts
- axle final-drive and differential positions
- construction-equipment wheel and pivot hubs
Known failure patterns
- cup creep and housing fretting when the specified outer-ring press fit is not achieved
- 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
- edge loading when shaft deflection exceeds the few arc-minutes of misalignment the adjusted pair allows
Selection pitfalls — read before you substitute
- Hub and pinion bearings of this 45 mm bore class are commonly adjusted in pairs; verify end play against the axle drawing and re-torque after bedding-in rather than trusting the initial preload on 32209.
- The heavy-section 32200 family at 45 mm bore (85×24.75 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 5,900 r/min oil ceiling.
- Back-to-back and face-to-face arrangements react differently to shaft bending: pick the pair orientation for the moment load before locking the 45 mm shoulder geometry, because retrofitting flips the cups.
- Grease packs must leave free volume in the 24.75 mm-wide set; over-greasing a paired bearing churning at the 5,900 r/min oil-band speed raises temperature and destroys the preload setting.
- Grease packs must leave free volume in the 24.75 mm-wide set; over-greasing a paired bearing churning at the 5,900 r/min oil-band speed raises temperature and destroys the preload setting.
- The 91/100 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32209 (ISO 355 3DC); 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 32209?
32209 is a metric 4T tapered roller bearing to ISO 355: 45 mm bore, 85 mm outside diameter and 24.75 mm assembled width T (1.772 × 3.346 × 0.974 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 91 kN, C0 100 kN (2203E prints no Pu for this size), grease limiting speed 4,400 r/min, oil speed 5,900 r/min, mass about 604 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32209?
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 (32209); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32209 designation encode the 45 mm bore and what is 3DC?
last two digits 09 are the ISO bore code, ×5 = 45 mm (codes 00–03 use the 10/12/15/17 exception table). The 85 mm OD and 24.75 mm assembled T follow the ISO 355 dimension-series plan. 3DC 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 32209 list two speeds, 4,400 and 5,900 r/min?
The lower figure, 4,400 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32209 at 5,900 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32209 mean?
It is the basic open 4T execution — steel cage, adjusted mounting, no seal or feature suffix. NTN uses U for the uprated design, UTG for ULTAGE large-bearing specs, X for the ISO boundary section, and C/CA/D/A for contact-angle or internal-design variants; all are separate order numbers.
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.