33207-NTN bearing: complete specifications & equivalents
The 33207-NTN is a ISO 355 radial bearing sized 35 x 72 x 28 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 35 mm |
| Outer diameter D | 72 mm |
| Width B | 28 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 97 kN |
| Basic static load rating C0 | 109 kN |
| Limiting speed (mechanical) | 5500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 539 g |
| Manufacturer designation | NTN 33207 |
| 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 | 1.378 in |
|---|---|
| Outer diameter D | 2.835 in |
| Width B | 1.102 in |
| ISO bore code | 07 |
| Radial section height (D−d)/2 | 18.5 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) | 5 of 18 |
| Bore above smallest 33200-series size | 10 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33207 | 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. |
| 33207-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 33207-NTN model number is decoded
NTN supplies this 35 mm bore tapered roller position as 33207: one cone assembly, one cup, line-contact rollers and a steel cage, rated 97 kN basic dynamic and 109 kN static on the medium-wide 33200 family. Digit by digit, the bare number identifies the medium-wide 33200 family and a bore code resolving to 35 mm; 72 mm OD and 28 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 35 mm bore the application supplies the seals and the grease fill or oil supply to the 2DE ISO 355 assembly. The two speed columns differ by a factor of .74 (grease/limiting 5,500 vs oil 7,400 r/min); heat generation at the cone rib decides which lubrication a real 33207 arrangement can sustain. After mounting check the contact pattern with marking blue: a pattern biased to the large or small roller end means the 35 mm pair is misadjusted and the 28 mm T set will edge-load in service.
Typical equipment & failure modes
Common applications
- construction-equipment wheel and pivot hubs
- truck and bus wheel hubs in paired arrangements
- industrial gearbox and speed-reducer shafts
- bevel and helical pinion drives with high thrust component
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
- false brinelling on a stationary paired set exposed to external vibration
Selection pitfalls — read before you substitute
- Hub and pinion bearings of this 35 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 33207.
- The medium-wide 33200 family at 35 mm bore (72×28 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 7,400 r/min oil ceiling.
- Minimum load matters at high speed: an unloaded 33207 at a large fraction of 5,500 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded pair arrangements.
- Open 33207 units have no seals: a wheel-hub or gearbox application needs external sealing or the 5,500 r/min grease figure is meaningless once water reaches the cone rib.
- The 18.5 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 33207 or the ring will bottom out on the radius instead of the shoulder face.
- The 97/109 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 33207 (ISO 355 2DE); 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 33207?
33207 is a metric 4T tapered roller bearing to ISO 355: 35 mm bore, 72 mm outside diameter and 28 mm assembled width T (1.378 × 2.835 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 97 kN, C0 109 kN (2203E prints no Pu for this size), grease limiting speed 5,500 r/min, oil speed 7,400 r/min, mass about 539 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 33207?
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 (33207); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 33207 designation encode the 35 mm bore and what is 2DE?
last two digits 07 are the ISO bore code, ×5 = 35 mm (codes 00–03 use the 10/12/15/17 exception table). The 72 mm OD and 28 mm assembled T follow the ISO 355 dimension-series plan. 2DE 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 33207 list two speeds, 5,500 and 7,400 r/min?
The lower figure, 5,500 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 33207 at 7,400 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 33207 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.