Angular contact ball bearing · 73 series
7304 bearing
20 × 52 × 15 mm
The 7304 is a angular contact ball bearing with a 20 mm bore, 52 mm outside diameter and 15 mm width. Medium series, same envelope as 63xx.
- Bore d
- 20 mm 0.7874 in
- Outside diameter D
- 52 mm 2.0472 in
- Width B
- 15 mm 0.5906 in
- Dimension series
- 03
- Load directions
- Combined radial and axial (one direction per bearing)
Designation explained
What 7304 means
Standard bearing numbers encode the type, the dimension series and the bore. Anything after the base number — seals, clearance, cage — is a suffix.
| Part | Meaning |
|---|---|
7 | Single-row angular contact ball bearing |
3 | Diameter series 3, dimension series 03 |
04 | 04 → 20 mm bore (04 × 5) |
Variants
Common 7304 variants
Suffixes change the bearing without changing its boundary dimensions. The exact letters differ between manufacturers — always order by the full designation from the maker you choose.
| Suffix | Example | Meaning |
|---|---|---|
B / BE | 7304B | 40° contact angle |
AC | 7304AC | 25° contact angle |
C | 7304C | 15° contact angle (mostly precision bearings) |
DB / DF / DT | 7304B-DB | Matched pair arranged back-to-back / face-to-face / tandem |
M / TVP / J | 7304B-M | Cage: brass (M), polyamide (TVP) or pressed steel (J) |
Same envelope
Same 20 × 52 × 15 mm, different type
These bearings have exactly the same bore, outside diameter and width but are a different type. They fit the same housing and shaft, but carry loads differently — same size is not the same function.
Same bore
Other 20 mm bore bearings
Every standard bearing in this reference with a 20 mm bore, from light to heavy sections.
| Designation | Type | D | B / H |
|---|---|---|---|
| 6004 | Deep groove ball bearing | 42 mm | 12 mm |
| 6204 | Deep groove ball bearing | 47 mm | 14 mm |
| 6404 | Deep groove ball bearing | 72 mm | 19 mm |
| 61804 | Deep groove ball bearing | 32 mm | 7 mm |
| 61904 | Deep groove ball bearing | 37 mm | 9 mm |
| 16004 | Deep groove ball bearing | 42 mm | 8 mm |
| 1204 | Self-aligning ball bearing | 47 mm | 14 mm |
| 2204 | Self-aligning ball bearing | 47 mm | 18 mm |
| 2304 | Self-aligning ball bearing | 52 mm | 21 mm |
| 7204 | Angular contact ball bearing | 47 mm | 14 mm |
| NU204 | Cylindrical roller bearing | 47 mm | 14 mm |
| NU2204 | Cylindrical roller bearing | 47 mm | 18 mm |
| NU2304 | Cylindrical roller bearing | 52 mm | 21 mm |
| 30204 | Tapered roller bearing | 47 mm | 15.25 mm |
| 30304 | Tapered roller bearing | 52 mm | 16.25 mm |
| 32004X | Tapered roller bearing | 42 mm | 15 mm |
| 32204 | Tapered roller bearing | 47 mm | 19.25 mm |
| 32304 | Tapered roller bearing | 52 mm | 22.25 mm |
| 51104 | Thrust ball bearing | 35 mm | 10 mm |
| 51204 | Thrust ball bearing | 40 mm | 14 mm |
| UCP204 | Pillow block bearing unit | — | — |
Where to buy
Find 7304 at sellers
Search results on independent sellers. We are not affiliated with them, do not earn from these links and do not see their prices or stock. Results mix brands and variants — check the full designation before you order.
About these dimensions. Boundary dimensions follow ISO 15 (radial bearings — boundary dimensions, general plan), dimension series 03, and are the same for every manufacturer of a standard 7304. Chamfers, load ratings, speed limits and weight depend on the manufacturer and design and are not shown — use the maker's datasheet for engineering decisions. Last checked 9 October 2026. Spotted an error? Tell us.
Learn more
What size is a 7304 bearing?
A 7304 is a angular contact ball bearing with a 20 mm bore, 52 mm outside diameter and 15 mm width (20 × 52 × 15 mm). These boundary dimensions follow the ISO dimension plan, so they are the same across manufacturers.
Can I replace 7304 with another bearing of the same size?
Other bearing types can share the same 20 × 52 × 15 mm envelope, but a different type has different load directions, speed limits and mounting needs. Same dimensions alone do not make two bearings interchangeable.
Where are the load ratings and speed limits?
They depend on the manufacturer and internal design, so we do not list a single value. Check the datasheet for the exact full designation you intend to use.
Need 7304 data for a whole catalog?
We can help with that.
Normalized specifications, variants and supplier listings for every bearing you sell, with the source behind each value.