UCP204 Bearing Dimensions
UCP204 is a pillow block bearing unit for a 20 mm shaft, with a 33.3 mm centre height and 95 mm bolt hole spacing. Ask for a price.
UCP204 specifications
| Shaft diameter d | 20 mm |
|---|---|
| Centre height H | 33.3 mm |
| Base length L | 129 mm — JIS maximum |
| Bolt hole spacing J | 95 mm |
| Overall height H0 | 66 mm — JIS maximum |
| Insert width B | 31 mm |
| Mounting bolt | M10 |
| Seal / shield options | Sealed insert bearing (UC type) with cast iron housing |
| Material | Insert: GCr15 chrome bearing steel (rings and rolling elements); housing: cast iron |
| Precision | P0 (standard) |
| Radial clearance | C0 (standard); C3 on request |
Dimensions per JIS B 1557 standard sizes; FULI's factory drawing to follow. "JIS maximum" marks an upper limit set by the standard. ISO 3228 housings of this size use a 96 mm bolt spacing. Please confirm the bolt spacing with your quote.
Load ratings & speed
| Dynamic load rating Cr | 12.8 kN |
|---|---|
| Static load rating C0r | 6.6 kN |
| Limiting speed, shaft js7 / j7 | 6,700 rpm |
| Limiting speed, shaft h7 | 4,900 rpm |
| Weight | 0.7 kg — approx. |
Values from FULI's catalog; confirm for your application.
Inch bore versions
| Metric model | Inch model | Bore (in) | Bore (mm) |
|---|---|---|---|
| UCP204 | UCP204-12 | 3/4" | 19.05 |
Inch bore versions use the same housing and outer dimensions as the metric UCP204; only the bore is different. The dimensions above and the JIS / ISO bolt spacing note under Interchange apply to both. Write the inch designation on your order, for example UCP204-12.
How to read the UCP204 designation
| Segment | Meaning |
|---|---|
| UC | Insert bearing with set-screw locking and spherical outside diameter |
| P | Pillow block (plummer block) housing |
| 2 | 200 series (light duty) |
| 04 | Bore code 04 → 20 mm bore. ISO bore code (00–03 = 10/12/15/17 mm; 04 and above = code × 5 mm). |
UCP204 interchange
UCP204 is a housed unit: a UC204 insert bearing in a P204 housing. The insert bearing dimensions follow ISO and interchange between manufacturers. Housing dimensions such as bolt hole spacing can differ between the JIS and ISO versions of the same designation, so please confirm the mounting dimensions with us before ordering.
Brand numbers for UCP, UCF and UCFL units: Pillow Block Bearing Cross Reference.
Brand names are trademarks of their respective owners. FULI is not affiliated with, authorized by or endorsed by these companies. Part numbers are shown for interchange reference only. FULI dimensions, load ratings and speeds come from the FULI catalog.
UCP204 compared with nearby sizes and housings
UCP204 is a pillow block unit that holds the UC204 insert on a 20 mm shaft: centre height H 33.3 mm, base length L 129 mm (JIS maximum) and overall height H0 66 mm (JIS maximum) with M10 bolts.
The same 204 size is also made as UCF204 (square flange unit, d 20 · L 86 · J 64 mm) and UCFL204 (oval flange unit, d 20 · L 113 · J 90 mm). All of them take the same UC204 insert, so a worn insert can be changed without changing the housing type.
UCP205 is the next larger size in the same series on this site: shaft d 25 mm (5 mm more), inner ring width B 34.1 mm (3.1 mm more), centre height H 36.5 mm (3.2 mm more) and bolt spacing J 105 mm (10 mm more).
UCP202 is the next smaller size in the same series on this site: shaft d 15 mm (5 mm less), inner ring width B 31 mm (the same), centre height H 30.2 mm (3.1 mm less) and bolt spacing J 95 mm (the same).
| Model | Type | Main dimensions | Weight (kg) |
|---|---|---|---|
| UCP204 | pillow block unit (this page) | d 20 · H 33.3 · J 95 mm (JIS) | 0.7 |
| UCP202 | pillow block unit | d 15 · H 30.2 · J 95 mm | — |
| UCP205 | pillow block unit | d 25 · H 36.5 · J 105 mm | 0.8 |
| UC204 | insert bearing | 20 × 47 × 31 mm (d × D × B) | 0.17 |
| SB204 | insert bearing | 20 × 47 × 25 mm (d × D × B) | — |
| SA204 | insert bearing | 20 × 47 × 21.5 mm (d × D × B) | — |
| UCF204 | square flange unit | d 20 · L 86 · J 64 mm | — |
| UCFL204 | oval flange unit | d 20 · L 113 · J 90 mm | — |
Dimensions in mm from the model pages; weight from FULI's catalog, — = not listed on this site.
UCP204 weight, load ratings and speed
FULI's catalog gives about 0.7 kg for the complete unit, housing and insert together, so 100 pieces of UCP204 weigh about 70 kg before packing.
The catalog lists UCP204 with a dynamic load rating of 12.8 kN and a static load rating of 6.6 kN. Its speed limits depend on the shaft tolerance: 6,700 rpm on a js7 or j7 shaft and 4,900 rpm on an h7 shaft. A closer shaft fit holds the inner ring more evenly, which is why the js7 / j7 figure is higher.
Values from FULI's catalog; confirm for your application.
UCP204 dimensions in inches
The nearest common inch shaft size to the 20 mm bore of UCP204 is 13/16 in (20.64 mm), 0.64 mm larger than the bore, so UCP204 will not go on it. An inch shaft needs an inch bore insert. FULI also makes UCP204 with inch bores: UCP204-12 for a 3/4 in shaft (19.05 mm). The outside dimensions stay the same as the metric UCP204.
| Dimension | Millimetres | Inches |
|---|---|---|
| Shaft diameter d | 20 mm | 0.7874 in |
| Centre height H | 33.3 mm | 1.3110 in |
| Base length L (JIS maximum) | 129 mm | 5.0787 in |
| Bolt hole spacing J | 95 mm | 3.7402 in |
| Overall height H0 (JIS maximum) | 66 mm | 2.5984 in |
| Insert width B | 31 mm | 1.2205 in |
Converted at 1 in = 25.4 mm and rounded to four decimals. The bearing itself is made to the millimetre sizes.
Mounting UCP204 (general guidance)
General guidance, not a FULI specification: insert bearings slide onto the shaft rather than being pressed on, and are held by their locking device. A shaft ground or drawn to h7 is common; a closer shaft such as js7 or j7 suits higher speed. For UCP204 the catalog gives 6,700 and 4,900 rpm for the two cases.
The UC204 insert in UCP204 is locked by set screws in the extended inner ring. Housed-unit problems usually start at the set screws: if the inner ring is not held, it turns on the shaft and wears it. Tighten each screw to the torque in the mounting instructions, and check them again after the first hours of running.
Bolt UCP204 down with M10 bolts at 95 mm spacing on a flat, rigid face. Line up the two housings on a shaft before tightening the bolts fully, then lock the inserts, so the shaft is not bent between them.
Grease for UCP204
The insert in UCP204 is sealed on both sides and greased at the factory. If the housing has a grease fitting, add grease slowly through it while the shaft turns until a little fresh grease shows at the seals; general practice is to relubricate more often in wet or dusty places.
Greases for a stated temperature range can be specified on the order; for North America a range of −40 to 120 °C is often asked for.
How FULI supplies UCP204
FULI supplies UCP204 as a complete unit, or the UC204 insert on its own for replacement. Before packing, the factory checks the mounting torque, the fit of the insert in the housing, the radial clearance and that the base-to-centre height is consistent across the batch.
Rings are marked with a brand you are authorised to use, with the FULI brand, or left neutral, as your order states. The box is printed with the model, precision class and brand.
Inquiries that leave out the prefix or suffix letters are the usual cause of a wrong quote, so write the full designation, for example UCP204 or UCP204-12 for the inch bore.
Tools and guides for UCP204
Typical applications
- Conveyors
- Fans and blowers
- Agricultural machinery
- Grain and food processing lines
FAQ
What shaft size does UCP204 fit?
A 20 mm shaft (0.7874 in). For inch shafts the same size is made as UCP204-12 (3/4 in).
What is the difference between UCP204 and UCP205?
UCP205 is the next size up, for a 25 mm shaft, with inner ring width B 34.1 mm (3.1 mm more), centre height H 36.5 mm (3.2 mm more) and bolt spacing J 105 mm (10 mm more). Choose UCP205 when the shaft is larger or the load is higher; the housings are not interchangeable.
Which insert fits UCP204?
The UC204 insert (20 × 47 × 31 mm). It is sold on its own for replacement.
UCP204 or UCF204: which should I use?
Both hold the same UC204 insert on a 20 mm shaft. UCP204 is a pillow block unit (d 20 · H 33.3 · J 95 mm (JIS)); UCF204 is a square flange unit (d 20 · L 86 · J 64 mm). Choose by how the bearing is fixed to the machine: a pillow block bolts to a surface parallel to the shaft, a flange to a face across it.
How much does UCP204 weigh?
About 0.7 kg in FULI's catalog; 100 pieces weigh about 70 kg before packing.
Does UCP204 come as a complete unit or insert only?
UCP204 is normally supplied as a complete unit (insert bearing already fitted in the housing). The insert can also be quoted separately if you are replacing only the bearing.