At a glance
61804
A designation used in catalogues following the longer series notation for this size.
Search this number when it appears on the original drawing, bearing marking or manufacturer's catalogue.
6804
A commonly used alternative series notation for the same nominal boundary size.
Search this number as an additional cross-reference and then check the complete suffix and technical data.
Key differences
Typical design distinctions. The complete designation and current product specification take precedence.
Swipe the table horizontally to see both options →
| What to compare | 61804 | 6804 |
|---|---|---|
| Nominal bore | 20 mm | 20 mm |
| Nominal outside diameter | 32 mm | 32 mm |
| Nominal width | 7 mm | 7 mm |
| Bearing family | Deep-groove ball bearing | Deep-groove ball bearing |
| Suffix | Closure, clearance and cage still matter | Closure, clearance and cage still matter |
| Ratings | Manufacturer and construction specific | Manufacturer and construction specific |
Before you choose
- Common boundary dimensions do not guarantee the same chamfer, grease or speed rating.
- A cross-reference should retain the original manufacturer's full designation.
- Compare available ABEC/ISO tolerance data separately from the basic size number.
Check the actual model
Search a full designation, inspect its technical data, then compare candidate records. Similar names or dimensions do not guarantee interchangeability.
Filters show recorded catalogue attributes. Open each candidate to confirm its exact specification.
A few things worth clarifying
Are 61804 and 6804 always identical?
They commonly share boundary dimensions, but the full products can differ in internal and suffix specifications.
Why search both designations?
Manufacturers and markets use different series notation, so one search may omit a relevant record.
Reference basis & limits
- SKF — Rolling bearings catalogue: 61804-series boundary dimensions
- NSK — 6804 single-row deep groove ball bearing product data
Independent explanatory content; not a manufacturer endorsement or approval of a replacement. Verify current product data, fits, lubrication and operating conditions before applying a comparison.