UCFL204 Bearing Dimensions
UCFL204 2-bolt oval flange bearing unit: 20 mm bore, 90 mm bolt centres. FL204 housing + UC204 insert, designation, size-equivalent codes.
UCFL204 specifications
| Shaft diameter d | 20 mm |
|---|---|
| Flange length L | 113 mm |
| Bolt hole spacing J | 90 mm |
| Flange width H | 60 mm |
| 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 |
| 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 UCFL204 designation
| Segment | Meaning |
|---|---|
| UC | Insert bearing with set-screw locking and spherical outside diameter |
| FL | Two-bolt oval flange 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). |
UCFL204 interchange
UCFL204 is a housed unit: a UC204 insert bearing in an FL204 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.
UCFL204 compared with nearby sizes and housings
UCFL204 is a oval flange unit that holds the UC204 insert on a 20 mm shaft: flange length L 113 mm and flange width H 60 mm with M10 bolts.
The same 204 size is also made as UCP204 (pillow block unit, d 20 · H 33.3 · J 95 mm (JIS)) and UCF204 (square flange unit, d 20 · L 86 · J 64 mm). All of them take the same UC204 insert, so a worn insert can be changed without changing the housing type.
UCFL205 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), length L 130 mm (17 mm more) and bolt spacing J 99 mm (9 mm more), and it takes M14 bolts instead of M10.
| Model | Type | Main dimensions | Weight (kg) |
|---|---|---|---|
| UCFL204 | oval flange unit (this page) | d 20 · L 113 · J 90 mm | — |
| UCFL205 | oval flange unit | d 25 · L 130 · J 99 mm | — |
| 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) | — |
| UCP204 | pillow block unit | d 20 · H 33.3 · J 95 mm (JIS) | 0.7 |
| UCF204 | square flange unit | d 20 · L 86 · J 64 mm | — |
Dimensions in mm from the model pages; weight from FULI's catalog, — = not listed on this site.
UCFL204 load ratings
FULI's catalog has no load rating line for UCFL204 itself, so none is given here. The ratings of the UC204 insert are on its own page. Ask us and we send the figures with the quotation.
UCFL204 dimensions in inches
The nearest common inch shaft size to the 20 mm bore of UCFL204 is 13/16 in (20.64 mm), 0.64 mm larger than the bore, so UCFL204 will not go 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 | 20 mm | 0.7874 in |
| Flange length L | 113 mm | 4.4488 in |
| Bolt hole spacing J | 90 mm | 3.5433 in |
| Flange width H | 60 mm | 2.3622 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 UCFL204 (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 UC204 insert in UCFL204 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 UCFL204 down with M10 bolts at 90 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 UCFL204
The insert in UCFL204 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 UCFL204
FULI supplies UCFL204 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 UCFL204.
Tools and guides for UCFL204
Typical applications
- Conveyors
- Packaging machinery
- Agricultural machinery
- Textile machinery
FAQ
What shaft size does UCFL204 fit?
A 20 mm shaft (0.7874 in).
What is the difference between UCFL204 and UCFL205?
UCFL205 is the next size up, for a 25 mm shaft, with inner ring width B 34.1 mm (3.1 mm more), length L 130 mm (17 mm more) and bolt spacing J 99 mm (9 mm more). It takes M14 bolts. Choose UCFL205 when the shaft is larger or the load is higher; the housings are not interchangeable.
Which insert fits UCFL204?
The UC204 insert (20 × 47 × 31 mm). It is sold on its own for replacement.
UCFL204 or UCP204: which should I use?
Both hold the same UC204 insert on a 20 mm shaft. UCFL204 is a oval flange unit (d 20 · L 113 · J 90 mm); UCP204 is a pillow block unit (d 20 · H 33.3 · J 95 mm (JIS)). 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 UCFL204 come as a complete unit or insert only?
UCFL204 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 UCFL204?
Load ratings for UCFL204 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.