33205-NTN bearing: complete specifications & equivalents
The 33205-NTN is a ISO 355 radial bearing sized 25 x 52 x 22 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 25 mm |
| Outer diameter D | 52 mm |
| Width B | 22 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 52.5 kN |
| Basic static load rating C0 | 57.5 kN |
| Limiting speed (mechanical) | 7300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 219 g |
| Manufacturer designation | NTN 33205 |
| 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 | 0.984 in |
|---|---|
| Outer diameter D | 2.047 in |
| Width B | 0.866 in |
| ISO bore code | 05 |
| Radial section height (D−d)/2 | 13.5 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) | 1 of 18 |
| Bore above smallest 33200-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33205 | 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 33205-NTN model number is decoded
NTN supplies this 25 mm bore tapered roller position as 33205: one cone assembly, one cup, line-contact rollers and a steel cage, rated 52.5 kN basic dynamic and 57.5 kN static on the medium-wide 33200 family. Reading the designation: the leading five digits follow the ISO 355 metric plan (dimension family plus two-digit bore code), and 33205 resolves to 25 mm bore; the NTN factory mark 4T is stamped on cone and cup but is a brand mark, not a size code, so the catalogue sku is printed without it. The printed contact-angle geometry gives the medium-wide 33200 family its characteristic load split — at 52.5/57.5 kN (C/C0) the static rating is about 1.10× C, typical of tapered bearings proportioned for heavy combined duty. Speed planning uses both catalogue columns: grease 7,300 r/min is the cage/rib mechanical ceiling for 33205, oil 9,800 r/min is available with circulating oil — a 2,500 r/min margin at this size. Mount the 25 mm-bore cone on the shaft first (induction heat, max 120 °C), fit the cup square in its housing, then set preload or end play; never drive the cup home through the rollers of 33205.
Typical equipment & failure modes
Common applications
- agricultural implement hubs and ground-tool drives
- small gearbox input shafts with combined load
- scooter and light-powersport wheel and gear positions
- small conveyor pulley shafts
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
- water-induced pitting when the open bearing is exposed to washdown without external seals
Selection pitfalls — read before you substitute
- At 25 mm bore the thin section and small rollers are adjustment-sensitive: a quarter-turn of the locknut moves end play by more than on large bearings, so set the 33205 pair with a dial indicator rather than by feel.
- The medium-wide 33200 family at 25 mm bore (52×22 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 9,800 r/min oil ceiling.
- Grease packs must leave free volume in the 22 mm-wide set; over-greasing a paired bearing churning at the 9,800 r/min oil-band speed raises temperature and destroys the preload setting.
- Grease packs must leave free volume in the 22 mm-wide set; over-greasing a paired bearing churning at the 9,800 r/min oil-band speed raises temperature and destroys the preload setting.
- Minimum load matters at high speed: an unloaded 33205 at a large fraction of 7,300 r/min lets rollers skid and smear the cone rib; spring-preload lightly loaded pair arrangements.
- The 52.5/57.5 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 33205 (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 33205?
33205 is a metric 4T tapered roller bearing to ISO 355: 25 mm bore, 52 mm outside diameter and 22 mm assembled width T (0.984 × 2.047 × 0.866 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 52.5 kN, C0 57.5 kN (2203E prints no Pu for this size), grease limiting speed 7,300 r/min, oil speed 9,800 r/min, mass about 219 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 33205?
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 (33205); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 33205 designation encode the 25 mm bore and what is 2DE?
last two digits 05 are the ISO bore code, ×5 = 25 mm (codes 00–03 use the 10/12/15/17 exception table). The 52 mm OD and 22 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 33205 list two speeds, 7,300 and 9,800 r/min?
The lower figure, 7,300 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 33205 at 9,800 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 33205 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.