Thrust ball bearing · 513 series
51318 bearing
90 × 155 × 50 mm
The 51318 is a thrust ball bearing with a 90 mm bore, 155 mm outside diameter and 50 mm height. Medium series for heavier axial loads.
- Bore d
- 90 mm 3.5433 in
- Outside diameter D
- 155 mm 6.1024 in
- Height H
- 50 mm 1.9685 in
- Dimension series
- 13
- Load directions
- Axial in one direction only
Designation explained
What 51318 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) |
18 | 18 → 90 mm bore (18 × 5) |
Variants
Common 51318 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) | 51318 | Standard single-direction design: shaft washer, housing washer, ball and cage assembly |
M / TN | 51318-M | Cage material: brass (M) or polyamide (TN) — varies by size and maker |
Same bore
Other 90 mm bore bearings
Every standard bearing in this reference with a 90 mm bore, from light to heavy sections.
| Designation | Type | D | B / H |
|---|---|---|---|
| 6018 | Deep groove ball bearing | 140 mm | 24 mm |
| 6218 | Deep groove ball bearing | 160 mm | 30 mm |
| 6318 | Deep groove ball bearing | 190 mm | 43 mm |
| 6418 | Deep groove ball bearing | 225 mm | 54 mm |
| 61818 | Deep groove ball bearing | 115 mm | 13 mm |
| 61918 | Deep groove ball bearing | 125 mm | 18 mm |
| 1218 | Self-aligning ball bearing | 160 mm | 30 mm |
| 1318 | Self-aligning ball bearing | 190 mm | 43 mm |
| 2218 | Self-aligning ball bearing | 160 mm | 40 mm |
| 2318 | Self-aligning ball bearing | 190 mm | 64 mm |
| 7218 | Angular contact ball bearing | 160 mm | 30 mm |
| 7318 | Angular contact ball bearing | 190 mm | 43 mm |
| NU218 | Cylindrical roller bearing | 160 mm | 30 mm |
| NU318 | Cylindrical roller bearing | 190 mm | 43 mm |
| NU2218 | Cylindrical roller bearing | 160 mm | 40 mm |
| NU2318 | Cylindrical roller bearing | 190 mm | 64 mm |
| 22218 | Spherical roller bearing | 160 mm | 40 mm |
| 22318 | Spherical roller bearing | 190 mm | 64 mm |
| 30218 | Tapered roller bearing | 160 mm | 32.5 mm |
| 30318 | Tapered roller bearing | 190 mm | 46.5 mm |
| 32018X | Tapered roller bearing | 140 mm | 32 mm |
| 32218 | Tapered roller bearing | 160 mm | 42.5 mm |
| 51118 | Thrust ball bearing | 120 mm | 22 mm |
| 51218 | Thrust ball bearing | 135 mm | 35 mm |
| UCP218 | Pillow block bearing unit | — | — |
Where to buy
Find 51318 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 51318. 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 51318 bearing?
A 51318 is a thrust ball bearing with a 90 mm bore, 155 mm outside diameter and 50 mm height (90 × 155 × 50 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 51318 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.