32204-NTN bearing: complete specifications & equivalents
The 32204-NTN is a ISO 355 radial bearing sized 20 x 47 x 19.25 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 20 mm |
| Outer diameter D | 47 mm |
| Width B | 19.25 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 40.5 kN |
| Basic static load rating C0 | 39.5 kN |
| Limiting speed (mechanical) | 8800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 161 g |
| Manufacturer designation | NTN 32204 |
| 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 | 0.787 in |
|---|---|
| Outer diameter D | 1.85 in |
| Width B | 0.758 in |
| ISO bore code | 04 |
| Radial section height (D−d)/2 | 13.5 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) | 2 of 36 |
| Bore above smallest 32200-series size | 3 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32204 | 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. |
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 32204-NTN model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, the NTN order number 32204 denotes the heavy-section 32200 family of metric tapered roller bearings, 20 mm bore, 47 mm outside diameter and 19.25 mm assembled width T (0.787 × 1.85 × 0.758 in) to the ISO 355 boundary plan. Digit by digit, the bare number identifies the heavy-section 32200 family and a bore code resolving to 20 mm; 47 mm OD and 19.25 mm assembled T are the matching ISO 355 boundary dimensions shared with other makers of the same dimension series. With no letter after the number, 32204 is the basic open 4T execution: steel cage, normal adjustment, no seal or special internal-design suffix in the order code. 2203E does not print a Pu fatigue load limit for 32204; life work for this size uses the 40.5/39.5 kN C/C0 pair directly. Re-adjustment after bedding-in is standard practice: re-check end play once the paired 32204 arrangement has run in, because initial seat seating relaxes the set preload slightly.
Typical equipment & failure modes
Common applications
- steering-knuckle and kingpin positions
- small automotive wheel hubs and trailer axles
- light-vehicle differential and pinion shafts
- agricultural implement hubs and ground-tool drives
Known failure patterns
- cup creep and housing fretting when the specified outer-ring press fit is not achieved
- rib scoring when axial load is carried beyond the cone rib capacity of the adjusted pair
- preload loss from racewear when one bearing of the paired set is replaced without re-adjusting end play
- 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 20 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 32204 pair with a dial indicator rather than by feel.
- The heavy-section 32200 family at 20 mm bore (47×19.25 mm assembled) carries more capacity than the lighter 320/329 sections but generates more preload heat; confirm oil availability before running near the 12,000 r/min oil ceiling.
- Grease packs must leave free volume in the 19.25 mm-wide set; over-greasing a paired bearing churning at the 12,000 r/min oil-band speed raises temperature and destroys the preload setting.
- Replacing one half of an adjusted pair without resetting end play negates the 19.25 mm T dimension logic: re-adjust the set and re-verify the contact pattern rather than reusing the old spacer stack.
- ISO 355 makes the 20×47 mm envelope interchangeable but not the ratings: NTN prints 40.5/39.5 kN for this execution, and a cheaper same-number part can differ in roller complement and steel.
- The 40.5/39.5 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32204 (ISO 355 2DD); 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 32204?
32204 is a metric 4T tapered roller bearing to ISO 355: 20 mm bore, 47 mm outside diameter and 19.25 mm assembled width T (0.787 × 1.85 × 0.758 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 40.5 kN, C0 39.5 kN (2203E prints no Pu for this size), grease limiting speed 8,800 r/min, oil speed 12,000 r/min, mass about 161 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32204?
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 (32204); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32204 designation encode the 20 mm bore and what is 2DD?
last two digits 04 are the ISO bore code, ×5 = 20 mm (codes 00–03 use the 10/12/15/17 exception table). The 47 mm OD and 19.25 mm assembled T follow the ISO 355 dimension-series plan. 2DD 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 32204 list two speeds, 8,800 and 12,000 r/min?
The lower figure, 8,800 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32204 at 12,000 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32204 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.