Pillow block bearing unit · UCP200 series
UCP218 bearing
Ø90 mm shaft, H 101.6 mm
The UCP218 is a two-bolt pillow block unit for a 90 mm shaft: a UC218 insert bearing in a P218 cast-iron housing, with the shaft centre 101.6 mm above the base and bolt holes 262 mm apart. Two-bolt cast-iron pillow block with UC2xx set-screw insert bearing.
- Shaft d
- 90 mm 3.5433 in
- Centre height H
- 101.6 mm 4 in
- Bolt spacing J
- 262 mm 10.315 in
- Overall length L (approx.)
- 327 mm 12.874 in
- Insert / housing
- UC218 / P218
- Load directions
- Radial, moderate axial; tolerates initial misalignment
Designation explained
What UCP218 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 |
|---|---|
UC | Insert bearing with cylindrical bore and set screws (UC2xx) |
P | Two-bolt pillow block housing (P2xx) |
2 | Light series (200) |
18 | 18 → 90 mm shaft diameter (18 × 5) |
Variants
Common UCP218 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 |
|---|---|---|
-8, -12, -16 … | UCP218-16 | Inch shaft size in sixteenths of an inch, e.g. UCP205-16 for a 1″ shaft |
UK / UKP | UKP218+H | Tapered-bore insert for adapter sleeve mounting instead of set screws |
UCFL / UCF / UCT | UCFL218 | Same insert in a two-bolt flange, four-bolt flange or take-up housing |
SS / thermoplastic | SSUCP218 | Stainless steel or plastic housing variants for food and wash-down use |
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 |
| 51318 | Thrust ball bearing | 155 mm | 50 mm |
Where to buy
Find UCP218 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 JIS B 1559 / ISO 3228 for the shaft centre height and bolt spacing of P2xx housings, dimension series P2, and are the same for every manufacturer of a standard UCP218. 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 shaft fits a UCP218?
A UCP218 takes a 90 mm shaft. Inch versions carry a suffix in sixteenths of an inch — for example UCP218-16 for a 1″ shaft where that size exists.
What is the centre height of a UCP218?
The shaft centre sits 101.6 mm above the mounting base, with bolt holes 262 mm apart and an overall length of about 327 mm. Overall height and foot details vary slightly between manufacturers.
Can I replace only the bearing in a UCP218?
Yes — the insert is a UC218 and the housing a P218. Inserts from different makers with the same designation fit the standard housing.
Where are the load ratings?
They depend on the insert manufacturer and are not listed here. Check the datasheet for the exact unit you intend to use.
Need UCP218 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.