32004X bearing: complete specifications & equivalents
The 32004X is a ISO 355 radial bearing sized 20 x 42 x 15 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 | 42 mm |
| Width B | 15 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 27.6 kN |
| Basic static load rating C0 | 27.9 kN |
| Limiting speed (mechanical) | 9500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 97 g |
| Manufacturer designation | NTN 32004X |
| 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 & 32000-series range
| Bore d | 0.787 in |
|---|---|
| Outer diameter D | 1.654 in |
| Width B | 0.591 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 11 mm |
| Smallest bore in 32000-series | 20 mm |
| Largest outer diameter in 32000-series | 650 mm |
| Width range across 32000-series | 15–130 mm |
| Bore position in 32000-series (smallest first) | 1 of 43 |
| Bore above smallest 32000-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32004X | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data. |
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 32004X model number is decoded
NTN supplies this 20 mm bore tapered roller position as 32004X: one cone assembly, one cup, line-contact rollers and a steel cage, rated 27.6 kN basic dynamic and 27.9 kN static on the low-section 32000 family tuned for low friction. NTN also quotes this bearing with its ISO 355 dimension-series abbreviation, 3CC, which is the maker-neutral cross-reference for the 20×42 mm envelope; 4T is NTN's own tapered-roller brand mark on the parts. NTN grades 4T metric bearings as open bearings without integral seals; at 20 mm bore the application supplies the seals and the grease fill or oil supply to the 3CC ISO 355 assembly. 2203E does not print a Pu fatigue load limit for 32004X; life work for this size uses the 27.6/27.9 kN C/C0 pair directly. Re-adjustment after bedding-in is standard practice: re-check end play once the paired 32004X arrangement has run in, because initial seat seating relaxes the set preload slightly.
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
- rolling-contact fatigue after the catalogue L10 life at the actual combined load
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 32004X pair with a dial indicator rather than by feel.
- The thin 15 mm section of 32004X is built for low friction and tight envelopes, not the heavy preload of a 322/323 set; over-tightening adjustment on this 20 mm bore smears the roller ends against the rib.
- The 11.0 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 32004X or the ring will bottom out on the radius instead of the shoulder face.
- Do not confuse T (15 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 11.0 mm section leaves little room for an oversized shaft fillet; check the mounting-chamfer table for 32004X or the ring will bottom out on the radius instead of the shoulder face.
- The 27.6/27.9 kN ratings here are NTN Ball and Roller Bearings CAT.No.2203E figures for 32004X (ISO 355 3CC); 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 32004X?
32004X is a metric 4T tapered roller bearing to ISO 355: 20 mm bore, 42 mm outside diameter and 15 mm assembled width T (0.787 × 1.654 × 0.591 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 27.6 kN, C0 27.9 kN (2203E prints no Pu for this size), grease limiting speed 9,500 r/min, oil speed 13,000 r/min, mass about 97 g. It is an open, separable cone/cup bearing with a pressed-steel cage.
What does the 4T prefix mean on 32004X?
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 (32004X); the lower-case 4t- factory spelling of the code is retained among the search aliases.
How does the 32004X designation encode the 20 mm bore and what is 3CC?
last two digits 04 are the ISO bore code, ×5 = 20 mm (codes 00–03 use the 10/12/15/17 exception table). The 42 mm OD and 15 mm assembled T follow the ISO 355 dimension-series plan. 3CC 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 32004X list two speeds, 9,500 and 13,000 r/min?
The lower figure, 9,500 r/min, is the grease-lubricated limiting speed — the mechanical ceiling for the cage, rollers and cone-rib contact. With oil lubrication NTN rates 32004X at 13,000 r/min because oil removes rib-contact heat better. Real limits still depend on preload, oil flow and cooling.
What does the suffix on 32004X mean?
Suffix reading on 32004X: X marks the execution built to the ISO boundary-dimension section (interchangeable envelope, NTN internal geometry); the suffix is part of the order number and the variants are not interchangeable articles.
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.