33209-NTN bearing: complete specifications & equivalents
The 33209-NTN is a ISO 355 radial bearing sized 45 x 85 x 32 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 | 32 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 119 kN |
| Basic static load rating C0 | 141 kN |
| Limiting speed (mechanical) | 4400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 795 g |
| Manufacturer designation | NTN 33209 |
| 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 | 1.772 in |
|---|---|
| Outer diameter D | 3.346 in |
| Width B | 1.26 in |
| ISO bore code | 09 |
| Radial section height (D−d)/2 | 20 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) | 7 of 18 |
| Bore above smallest 33200-series size | 20 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33209 | 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 33209-NTN model number is decoded
The NTN 2203E table prints 33209 in the medium-wide 33200 family: 45 mm bore, 85 mm cup OD, 32 mm T, with a grease limiting speed of 4,400 r/min and an oil-lubricated ceiling of 5,900 r/min. NTN also quotes this bearing with its ISO 355 dimension-series abbreviation, 3DE, which is the maker-neutral cross-reference for the 45×85 mm envelope; 4T is NTN's own tapered-roller brand mark on the parts. The 20.0 mm radial section carries the roller complement across the 45–85 mm envelope; section and contact angle differ between NTN metric families even at the same bore, so 302/322/323 are not drop-in swaps. The 2.6 kN-per-mm-bore capacity figure for 33209 summarises the 119 kN rating over 45 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 45 mm pair is misadjusted and the 32 mm T set will edge-load in service.
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
- 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 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
- 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 33209.
- The medium-wide 33200 family at 45 mm bore (85×32 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.
- The 20.0 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 33209 or the ring will bottom out on the radius instead of the shoulder face.
- Minimum load matters at high speed: an unloaded 33209 at a large fraction of 4,400 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 33209 by size alone can deliver the wrong contact-angle execution for a pinion position.
- The 119/141 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 33209 (ISO 355 3DE); 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 33209?
33209 is a metric 4T tapered roller bearing to ISO 355: 45 mm bore, 85 mm outside diameter and 32 mm assembled width T (1.772 × 3.346 × 1.26 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 119 kN, C0 141 kN (2203E prints no Pu for this size), grease limiting speed 4,400 r/min, oil speed 5,900 r/min, mass about 795 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 33209?
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 (33209); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 33209 designation encode the 45 mm bore and what is 3DE?
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 32 mm assembled T follow the ISO 355 dimension-series plan. 3DE 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 33209 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 33209 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 33209 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.