UC328 Bearing Dimensions
UC328 insert bearing: 140 mm bore, 300 mm spherical OD, 145 mm width, set-screw lock. Fits P328/F328/FL328/T328 housings. Quote.
UC328 specifications
| Bore d | 140 mm |
|---|---|
| Outside diameter D | 300 mm |
| Inner ring width B | 145 mm |
| Outer ring width C | 73 mm |
| Seal / shield options | Sealed insert bearing (UC type), spherical outside diameter, set-screw locking |
| Material | GCr15 chrome bearing steel (rings and rolling elements) |
| 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 UC328 designation
| Segment | Meaning |
|---|---|
| UC | Insert bearing with set-screw locking and spherical outside diameter |
| 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). |
UC328 interchange
UC328 is an ISO designation. The boundary dimensions are identical across manufacturers; only suffixes (seals, clearance, cage) differ.
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.
UC328 compared with nearby sizes and housings
UC328 is a set-screw insert for a 140 mm shaft: outside diameter 300 mm, inner ring width 145 mm and outer ring width 73 mm.
The UC328 insert is the one fitted in UCP328 (pillow block unit) and UCFL328 (oval flange unit).
UC326 is the next smaller size in the same series on this site: shaft d 130 mm (10 mm less), outside diameter D 280 mm (20 mm less) and inner ring width B 135 mm (10 mm less).
| Model | Type | Main dimensions | Weight (kg) |
|---|---|---|---|
| UC328 | insert bearing (this page) | 140 × 300 × 145 mm (d × D × B) | — |
| UC326 | insert bearing | 130 × 280 × 135 mm (d × D × B) | — |
| UCP328 | pillow block unit | d 140 · H 200 · J 500 mm | — |
| 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.
UC328 load ratings
FULI's catalog has no load rating line for UC328 itself, so none is given here. Ask us and we send the figures with the quotation.
UC328 dimensions in inches
The nearest common inch shaft size to the 140 mm bore of UC328 is 5-1/2 in (139.70 mm), 0.3 mm smaller than the bore, so UC328 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 |
|---|---|---|
| Bore d | 140 mm | 5.5118 in |
| Outside diameter D | 300 mm | 11.8110 in |
| Inner ring width B | 145 mm | 5.7087 in |
| Outer ring width C | 73 mm | 2.8740 in |
Converted at 1 in = 25.4 mm and rounded to four decimals. The bearing itself is made to the millimetre sizes.
Mounting UC328 (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.
UC328 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.
The spherical outside diameter of UC328 lets the insert swivel in the housing seat while it is being mounted, which takes up small errors in shaft line. It does not make the bearing a self-aligning bearing in service.
Grease for UC328
The insert is sealed on both sides and greased at the factory. Fitted in a housing with a grease fitting, it can be relubricated through the housing; on its own it runs on the factory fill.
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 UC328
FULI supplies UC328 on its own as a replacement insert, or fitted in a housing as a complete unit. The rings and balls are GCr15 chrome steel and the radial clearance is C0 as standard, with C3 on request.
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 UC328.
Tools and guides for UC328
Typical applications
- Replacement inserts for UCP / UCF / UCFL housings
- Conveyors
- Agricultural machinery
FAQ
What shaft size does UC328 fit?
A 140 mm shaft (5.5118 in).
Which housings fit the UC328 insert?
UCP328 (pillow block unit) and UCFL328 (oval flange unit) all use UC328. Order UC328 on its own to replace a worn insert in any of them.
Can UC328 be ordered as an insert only, or as a complete unit?
Both. UC328 can be supplied on its own as a replacement insert for an existing housing, or fitted in a housing such as the UCP328 pillow block or UCF328 square flange and supplied as a complete unit. Tell us which you need when you send the inquiry.
Where are the load ratings for UC328?
Load ratings for UC328 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.