33007 bearing: complete specifications & equivalents
The 33007 is a ISO 355 radial bearing sized 35 x 62 x 21 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 | 62 mm |
| Width B | 21 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 56 kN |
| Basic static load rating C0 | 66.5 kN |
| Limiting speed (mechanical) | 6100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 263 g |
| Manufacturer designation | NTN 33007 |
| 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 & 33000-series range
| Bore d | 1.378 in |
|---|---|
| Outer diameter D | 2.441 in |
| Width B | 0.827 in |
| ISO bore code | 07 |
| Radial section height (D−d)/2 | 13.5 mm |
| Smallest bore in 33000-series | 25 mm |
| Largest outer diameter in 33000-series | 225 mm |
| Width range across 33000-series | 17–59 mm |
| Bore position in 33000-series (smallest first) | 3 of 24 |
| Bore above smallest 33000-series size | 10 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33007 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the 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 33007 model number is decoded
The NTN 2203E table prints 33007 in the slim 33000 family: 35 mm bore, 62 mm cup OD, 21 mm T, with a grease limiting speed of 6,100 r/min and an oil-lubricated ceiling of 8,100 r/min. Digit by digit, the bare number identifies the slim 33000 family and a bore code resolving to 35 mm; 62 mm OD and 21 mm assembled T are the matching ISO 355 boundary dimensions shared with other makers of the same dimension series. A tapered roller bearing reacts combined radial and one-direction axial load; NTN mounts 33007 cone and cup separately and adjusts end play or preload against a second bearing, so the arrangement locates the shaft in both directions. Grease relubrication at 6,100 r/min limiting speed targets the rib contact; if the drive needs 8,100 r/min it must be arranged for oil lubrication with a defined flow to the large roller ends. Fillet radii must clear the ring chamfers of the 62 mm cup and 35 mm cone; use undercut shoulders so the rings seat fully rather than bridging on a shaft radius.
Typical equipment & failure modes
Common applications
- truck and bus wheel hubs in paired arrangements
- industrial gearbox and speed-reducer shafts
- bevel and helical pinion drives with high thrust component
- pump and compressor drive shafts carrying combined load
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
- cage fatigue when the pair is run continuously near the grease limiting speed without oil cooling
- brinell marks on cone and cup raceways from impact during handling or hammering during fitting
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 33007.
- The thin 21 mm section of 33007 is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 35 mm bore smears the roller ends against the rib.
- ISO 355 makes the 35×62 mm envelope interchangeable but not the ratings: NTN prints 56/66.5 kN for this execution, and a cheaper same-number part can differ in roller complement and steel.
- The U/UTG/X/C/CA/D suffix variants of a base number share the bore but not the article: ordering 33007 by size alone can deliver the wrong contact-angle execution for a pinion position.
- Do not confuse T (21 mm assembled width of cone + cup) with the cone width when drawing spacers; an abutment sized to T instead of the ring width leaves the cup unseated.
- The 56/66.5 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 33007 (ISO 355 2CE); 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 33007?
33007 is a metric 4T tapered roller bearing to ISO 355: 35 mm bore, 62 mm outside diameter and 21 mm assembled width T (1.378 × 2.441 × 0.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 56 kN, C0 66.5 kN (2203E prints no Pu for this size), grease limiting speed 6,100 r/min, oil speed 8,100 r/min, mass about 263 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 33007?
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 (33007); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 33007 designation encode the 35 mm bore and what is 2CE?
last two digits 07 are the ISO bore code, ×5 = 35 mm (codes 00–03 use the 10/12/15/17 exception table). The 62 mm OD and 21 mm assembled T follow the ISO 355 dimension-series plan. 2CE 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 33007 list two speeds, 6,100 and 8,100 r/min?
The lower figure, 6,100 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 33007 at 8,100 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 33007 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.