Pillow block bearing unit · UCP200 series
UCP204 bearing
Ø20 mm shaft, H 33.3 mm
The UCP204 is a two-bolt pillow block unit for a 20 mm shaft: a UC204 insert bearing in a P204 cast-iron housing, with the shaft centre 33.3 mm above the base and bolt holes 95 mm apart. Two-bolt cast-iron pillow block with UC2xx set-screw insert bearing.
- Shaft d
- 20 mm 0.7874 in
- Centre height H
- 33.3 mm 1.311 in
- Bolt spacing J
- 95 mm 3.7402 in
- Overall length L (approx.)
- 127 mm 5 in
- Insert / housing
- UC204 / P204
- Load directions
- Radial, moderate axial; tolerates initial misalignment
Designation explained
What UCP204 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) |
04 | 04 → 20 mm shaft diameter (04 × 5) |
Variants
Common UCP204 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 … | UCP204-16 | Inch shaft size in sixteenths of an inch, e.g. UCP205-16 for a 1″ shaft |
UK / UKP | UKP204+H | Tapered-bore insert for adapter sleeve mounting instead of set screws |
UCFL / UCF / UCT | UCFL204 | Same insert in a two-bolt flange, four-bolt flange or take-up housing |
SS / thermoplastic | SSUCP204 | Stainless steel or plastic housing variants for food and wash-down use |
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 |
| 6304 | Deep groove ball bearing | 52 mm | 15 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 |
| 1304 | Self-aligning ball bearing | 52 mm | 15 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 |
| 7304 | Angular contact ball bearing | 52 mm | 15 mm |
| NU204 | Cylindrical roller bearing | 47 mm | 14 mm |
| NU304 | Cylindrical roller bearing | 52 mm | 15 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 |
Where to buy
Find UCP204 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 UCP204. 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 UCP204?
A UCP204 takes a 20 mm shaft. Inch versions carry a suffix in sixteenths of an inch — for example UCP204-16 for a 1″ shaft where that size exists.
What is the centre height of a UCP204?
The shaft centre sits 33.3 mm above the mounting base, with bolt holes 95 mm apart and an overall length of about 127 mm. Overall height and foot details vary slightly between manufacturers.
Can I replace only the bearing in a UCP204?
Yes — the insert is a UC204 and the housing a P204. 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 UCP204 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.