Thrust ball bearing · 513 series
51306 bearing
30 × 60 × 21 mm
The 51306 is a thrust ball bearing with a 30 mm bore, 60 mm outside diameter and 21 mm height. Medium series for heavier axial loads.
- Bore d
- 30 mm 1.1811 in
- Outside diameter D
- 60 mm 2.3622 in
- Height H
- 21 mm 0.8268 in
- Dimension series
- 13
- Load directions
- Axial in one direction only
Designation explained
What 51306 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 |
|---|---|
5 | Thrust ball bearing, single direction |
13 | Dimension series 13 (thrust) |
06 | 06 → 30 mm bore (06 × 5) |
Variants
Common 51306 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 |
|---|---|---|
(no suffix) | 51306 | Standard single-direction design: shaft washer, housing washer, ball and cage assembly |
M / TN | 51306-M | Cage material: brass (M) or polyamide (TN) — varies by size and maker |
Same bore
Other 30 mm bore bearings
Every standard bearing in this reference with a 30 mm bore, from light to heavy sections.
| Designation | Type | D | B / H |
|---|---|---|---|
| 6006 | Deep groove ball bearing | 55 mm | 13 mm |
| 6206 | Deep groove ball bearing | 62 mm | 16 mm |
| 6306 | Deep groove ball bearing | 72 mm | 19 mm |
| 6406 | Deep groove ball bearing | 90 mm | 23 mm |
| 61806 | Deep groove ball bearing | 42 mm | 7 mm |
| 61906 | Deep groove ball bearing | 47 mm | 9 mm |
| 16006 | Deep groove ball bearing | 55 mm | 9 mm |
| 1206 | Self-aligning ball bearing | 62 mm | 16 mm |
| 1306 | Self-aligning ball bearing | 72 mm | 19 mm |
| 2206 | Self-aligning ball bearing | 62 mm | 20 mm |
| 2306 | Self-aligning ball bearing | 72 mm | 27 mm |
| 7206 | Angular contact ball bearing | 62 mm | 16 mm |
| 7306 | Angular contact ball bearing | 72 mm | 19 mm |
| NU206 | Cylindrical roller bearing | 62 mm | 16 mm |
| NU306 | Cylindrical roller bearing | 72 mm | 19 mm |
| NU2206 | Cylindrical roller bearing | 62 mm | 20 mm |
| NU2306 | Cylindrical roller bearing | 72 mm | 27 mm |
| 22206 | Spherical roller bearing | 62 mm | 20 mm |
| 30206 | Tapered roller bearing | 62 mm | 17.25 mm |
| 30306 | Tapered roller bearing | 72 mm | 20.75 mm |
| 32006X | Tapered roller bearing | 55 mm | 17 mm |
| 32206 | Tapered roller bearing | 62 mm | 21.25 mm |
| 32306 | Tapered roller bearing | 72 mm | 28.75 mm |
| 51106 | Thrust ball bearing | 47 mm | 11 mm |
| 51206 | Thrust ball bearing | 52 mm | 16 mm |
| UCP206 | Pillow block bearing unit | — | — |
Where to buy
Find 51306 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 104 (thrust bearings — boundary dimensions), dimension series 13, and are the same for every manufacturer of a standard 51306. 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 51306 bearing?
A 51306 is a thrust ball bearing with a 30 mm bore, 60 mm outside diameter and 21 mm height (30 × 60 × 21 mm). These boundary dimensions follow the ISO dimension plan, so they are the same across manufacturers.
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 51306 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.