Tapered roller bearing
30304 Bearing Dimensions
30304 tapered roller bearing: bore 20 mm, dimensions 20x52x16.25 mm (ISO 355). Cone and cup widths, designation breakdown and size-equivalent codes.
30304 specifications
| Bore d | 20 mm |
|---|---|
| Outside diameter D | 52 mm |
| Total width T | 16.25 mm — assembled width of cup and cone |
| Seal / shield options | Open (cup and cone, no seals) |
| Material | GCr15 chrome bearing steel (rings and rolling elements) |
| Precision | P0 (standard); P6 on request |
| Radial clearance | Set during mounting (adjustable, not a C-class value) |
| Load ratings | Load ratings available on request for the specific batch and manufacturer. |
How to read the 30304 designation
| Segment | Meaning |
|---|---|
| 3 | Single row tapered roller bearing (metric, ISO 355) |
| 03 | Dimension series 03 |
| 04 | Bore code 04 → 20 mm bore. ISO bore code (00–03 = 10/12/15/17 mm; 04 and above = code × 5 mm). |
30304 interchange by brand
30304 is an ISO designation. The boundary dimensions are identical across manufacturers; only suffixes (seals, clearance, cage) differ.
| SKF | NSK | NTN | FAG | Timken | Note |
|---|---|---|---|---|---|
| 30304 | 30304 | 30304 | 30304 | 30304 | Same ISO designation |
Typical applications
- Vehicle wheel hubs and axles
- Gearboxes and reducers
- Agricultural machinery
- Conveyor pulleys
FAQ
Is 30304 the same size across brands?
Yes. 30304 is an ISO designation, so the bore, outside diameter and width are the same whichever manufacturer made it. Brand-specific suffixes only change details such as seals, clearance or cage.
Where are the load ratings for 30304?
Dynamic and static load ratings differ by manufacturer and batch, so they are not published on this page. Load ratings available on request for the specific batch and manufacturer.