Bearing size reference
Find a bearing by its number.
674 standard bearing sizes across 9 types. Enter a bearing number or dimensions to find its size, what the number means and where to buy it.
Suffixes like 2RS, ZZ, C3 or K are ignored — the page shows the base size and its variants.
Bearing types
Browse by type
Size tables for each type, grouped by series.
- 60 · 62 · 63 · 64 · 618 · 619 · 160
Deep groove ball bearings
The most common rolling bearing: one row of balls running in deep raceway grooves, available open, shielded or sealed.
170 sizes - 60x · 62x · 63x · 68x · 69x
Miniature ball bearings
Small deep groove ball bearings with 3–9 mm bores — 608, 625, 688 and friends — used in skateboards, 3D printers, fans and small motors.
33 sizes - 12 · 13 · 22 · 23
Self-aligning ball bearings
Two rows of balls with a common spherical outer raceway, tolerating shaft misalignment and deflection.
90 sizes - 72 · 73
Angular contact ball bearings
Raceways offset so that loads are carried at a contact angle, supporting combined radial and axial loads in one direction.
64 sizes - NU2 · NU3 · NU22 · NU23
Cylindrical roller bearings
Cylindrical rollers with line contact for high radial load capacity; ring flanges determine axial guidance.
110 sizes - 222 · 223
Spherical roller bearings
Two rows of barrel-shaped rollers with a spherical outer raceway: heavy loads plus misalignment tolerance.
49 sizes - 302 · 303 · 320X · 322 · 323
Tapered roller bearings
Tapered rollers between a cone and a cup carry heavy combined radial and axial loads — the wheel-hub and gearbox workhorse.
85 sizes - 511 · 512 · 513
Thrust ball bearings
Shaft washer, housing washer and a ball-and-cage assembly for purely axial loads in one direction.
55 sizes - UCP2
Pillow block bearing units
UCP two-bolt pillow block units: a set-screw insert bearing (UC2xx) in a cast-iron P2xx housing, ready to bolt to a frame.
18 sizes
Popular
Frequently looked-up sizes
| Bearing | Type | d × D × B (mm) |
|---|---|---|
| 608 | Miniature ball bearing | 8 × 22 × 7 |
| 625 | Miniature ball bearing | 5 × 16 × 5 |
| 688 | Miniature ball bearing | 8 × 16 × 5 |
| 6201 | Deep groove ball bearing | 12 × 32 × 10 |
| 6202 | Deep groove ball bearing | 15 × 35 × 11 |
| 6203 | Deep groove ball bearing | 17 × 40 × 12 |
| 6204 | Deep groove ball bearing | 20 × 47 × 14 |
| 6205 | Deep groove ball bearing | 25 × 52 × 15 |
| 6206 | Deep groove ball bearing | 30 × 62 × 16 |
| 6305 | Deep groove ball bearing | 25 × 62 × 17 |
| 6000 | Deep groove ball bearing | 10 × 26 × 8 |
| 61905 | Deep groove ball bearing | 25 × 42 × 9 |
| 7205 | Angular contact ball bearing | 25 × 52 × 15 |
| NU205 | Cylindrical roller bearing | 25 × 52 × 15 |
| 22210 | Spherical roller bearing | 50 × 90 × 23 |
| 30205 | Tapered roller bearing | 25 × 52 × 16.25 |
| 32210 | Tapered roller bearing | 50 × 90 × 24.75 |
| 51105 | Thrust ball bearing | 25 × 42 × 11 |
| UCP205 | Pillow block bearing unit | Ø25 shaft, H 36.5 |
| UCP206 | Pillow block bearing unit | Ø30 shaft, H 42.9 |
How bearing numbers work
Read a bearing number in three parts
Most standard bearing numbers follow the same pattern: bearing type, dimension series, bore code — then suffixes for seals, clearance and cage.
Are bearing sizes the same across brands?
For standard metric bearings, yes: the bore, outside diameter and width of a 6205 are the same from every manufacturer because they follow the ISO dimension plan. Load ratings, speed limits, seals and cages are not standardised and do differ.
Why does the search ignore suffixes?
Suffixes such as 2RS, ZZ, C3, K or E describe seals, clearance, bore shape or internal design. They do not change the boundary dimensions, so the base number tells you the size.
Do you sell bearings?
No. MyBearings is a bearing data reference. Each size page links to independent sellers if you want to buy.
Which bearings are missing?
This first release covers metric deep groove, self-aligning, angular contact, cylindrical roller, spherical roller and thrust ball bearings in their main series. Tapered roller, needle, inch and housed units will follow.
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