UCP328 Bearing Dimensions
UCP328 pillow block bearing unit: 140 mm bore, 500 mm bolt centres, 200 mm centre height. P328 housing + UC328 insert, designation, size-equivalent codes.
UCP328 specifications
| Shaft diameter d | 140 mm |
|---|---|
| Centre height H | 200 mm |
| Base length L | 620 mm |
| Bolt hole spacing J | 500 mm |
| Overall height H0 | 390 mm |
| Insert width B | 145 mm |
| Mounting bolt | M33 |
| 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 |
| Load ratings | Load ratings for this model are being checked against FULI's catalog. Ask for them with the quote. |
Dimensions cross-checked against published catalogues; please confirm with your quote.
How to read the UCP328 designation
| Segment | Meaning |
|---|---|
| UC | Insert bearing with set-screw locking and spherical outside diameter |
| P | Pillow block (plummer block) housing |
| 3 | 300 series (medium duty) |
| 28 | Bore code 28 → 140 mm bore. ISO bore code (00–03 = 10/12/15/17 mm; 04 and above = code × 5 mm). |
UCP328 interchange
UCP328 is a housed unit: a UC328 insert bearing in a P328 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.
UCP328 compared with nearby sizes and housings
UCP328 is a pillow block unit that holds the UC328 insert on a 140 mm shaft: centre height H 200 mm, base length L 620 mm and overall height H0 390 mm with M33 bolts.
The same 328 size is also made as UCFL328 (oval flange unit, d 140 · L 600 · J 500 mm). All of them take the same UC328 insert, so a worn insert can be changed without changing the housing type.
UCP326 is the next smaller size in the same series on this site: shaft d 130 mm (10 mm less), inner ring width B 135 mm (10 mm less), centre height H 180 mm (20 mm less), length L 600 mm (20 mm less), bolt spacing J 480 mm (20 mm less) and overall height H0 355 mm (35 mm less).
| Model | Type | Main dimensions | Weight (kg) |
|---|---|---|---|
| UCP328 | pillow block unit (this page) | d 140 · H 200 · J 500 mm | — |
| UCP326 | pillow block unit | d 130 · H 180 · J 480 mm | — |
| UC328 | insert bearing | 140 × 300 × 145 mm (d × D × B) | — |
| UCFL328 | oval flange unit | d 140 · L 600 · J 500 mm | — |
Dimensions in mm from the model pages; weight from FULI's catalog, — = not listed on this site.
UCP328 load ratings
FULI's catalog has no load rating line for UCP328 itself, so none is given here. The ratings of the UC328 insert are on its own page. Ask us and we send the figures with the quotation.
UCP328 dimensions in inches
The nearest common inch shaft size to the 140 mm bore of UCP328 is 5-1/2 in (139.70 mm), 0.3 mm smaller than the bore, so UCP328 would be loose on it. An inch shaft needs an inch bore insert. Inch bore versions are made for some sizes; ask us with the shaft size.
| Dimension | Millimetres | Inches |
|---|---|---|
| Shaft diameter d | 140 mm | 5.5118 in |
| Centre height H | 200 mm | 7.8740 in |
| Base length L | 620 mm | 24.4094 in |
| Bolt hole spacing J | 500 mm | 19.6850 in |
| Overall height H0 | 390 mm | 15.3543 in |
| Insert width B | 145 mm | 5.7087 in |
Converted at 1 in = 25.4 mm and rounded to four decimals. The bearing itself is made to the millimetre sizes.
Mounting UCP328 (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.
The UC328 insert in UCP328 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 UCP328 down with M33 bolts at 500 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 UCP328
The insert in UCP328 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 UCP328
FULI supplies UCP328 as a complete unit, or the UC328 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 UCP328.
Tools and guides for UCP328
Typical applications
- Conveyors
- Fans and blowers
- Agricultural machinery
- Grain and food processing lines
FAQ
What shaft size does UCP328 fit?
A 140 mm shaft (5.5118 in).
Which insert fits UCP328?
The UC328 insert (140 × 300 × 145 mm). It is sold on its own for replacement.
UCP328 or UCFL328: which should I use?
Both hold the same UC328 insert on a 140 mm shaft. UCP328 is a pillow block unit (d 140 · H 200 · J 500 mm); UCFL328 is a oval flange unit (d 140 · L 600 · J 500 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.
Does UCP328 come as a complete unit or insert only?
UCP328 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.
Where are the load ratings for UCP328?
Load ratings for UCP328 are being checked against FULI's catalog and are not shown on this page yet. Model pages with a "Load ratings & speed" table carry values from FULI's catalog.