UC205 Bearing Dimensions
UC205 is an insert bearing with a 25 mm bore, 52 mm outer diameter and 34.1 mm inner ring width. Fits P205/F205/FL205/T205 housings. Inch-bore suffixes. Quote.
UC205 specifications
| Bore d | 25 mm |
|---|---|
| Outside diameter D | 52 mm |
| Inner ring width B | 34.1 mm |
| Outer ring width C | 17 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 |
Dimensions from FULI's catalog.
Load ratings & speed
| Dynamic load rating Cr | 14.0 kN |
|---|---|
| Static load rating C0r | 7.9 kN |
| Limiting speed, shaft js7 / j7 | 5,600 rpm |
| Limiting speed, shaft h7 | 4,100 rpm |
| Weight | 0.21 kg — approx. |
Values from FULI's catalog; confirm for your application.
Inch bore versions
| Metric model | Inch model | Bore (in) | Bore (mm) |
|---|---|---|---|
| UC205 | UC205-14 | 7/8" | 22.23 |
| UC205 | UC205-15 | 15/16" | 23.81 |
| UC205 | UC205-16 | 1" | 25.40 |
Inch bore versions have the same outside diameter and ring widths as the metric UC205; only the bore is different. Write the inch designation on your order, for example UC205-14.
How to read the UC205 designation
| Segment | Meaning |
|---|---|
| UC | Insert bearing with set-screw locking and spherical outside diameter |
| 2 | 200 series (light duty) |
| 05 | Bore code 05 → 25 mm bore. ISO bore code (00–03 = 10/12/15/17 mm; 04 and above = code × 5 mm). |
UC205 interchange
UC205 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.
UC205 compared with nearby sizes and housings
UC205 is a set-screw insert for a 25 mm shaft: outside diameter 52 mm, inner ring width 34.1 mm and outer ring width 17 mm.
The UC205 insert is the one fitted in UCP205 (pillow block unit), UCF205 (square flange unit) and UCFL205 (oval flange unit). Other inserts with the same size code are SB205 (25 × 52 × 27 mm) and SA205 (25 × 52 × 21.5 mm).
UC206 is the next larger size in the same series on this site: shaft d 30 mm (5 mm more), outside diameter D 62 mm (10 mm more) and inner ring width B 38.1 mm (4 mm more).
UC204 is the next smaller size in the same series on this site: shaft d 20 mm (5 mm less), outside diameter D 47 mm (5 mm less) and inner ring width B 31 mm (3.1 mm less).
| Model | Type | Main dimensions | Weight (kg) |
|---|---|---|---|
| UC205 | insert bearing (this page) | 25 × 52 × 34.1 mm (d × D × B) | 0.21 |
| UC204 | insert bearing | 20 × 47 × 31 mm (d × D × B) | 0.17 |
| UC206 | insert bearing | 30 × 62 × 38.1 mm (d × D × B) | 0.32 |
| SB205 | insert bearing | 25 × 52 × 27 mm (d × D × B) | — |
| SA205 | insert bearing | 25 × 52 × 21.5 mm (d × D × B) | — |
| UCP205 | pillow block unit | d 25 · H 36.5 · J 105 mm | 0.8 |
| UCF205 | square flange unit | d 25 · J 70 mm (JIS) | 0.9 |
| UCFL205 | oval flange unit | d 25 · L 130 · J 99 mm | — |
Dimensions in mm from the model pages; weight from FULI's catalog, — = not listed on this site.
UC205 weight, load ratings and speed
FULI's catalog gives about 0.21 kg for the insert, so 100 pieces of UC205 weigh about 21 kg before packing.
The catalog lists UC205 with a dynamic load rating of 14.0 kN and a static load rating of 7.9 kN. Its speed limits depend on the shaft tolerance: 5,600 rpm on a js7 or j7 shaft and 4,100 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.
UC205 dimensions in inches
The nearest common inch shaft size to the 25 mm bore of UC205 is 1 in (25.40 mm), 0.4 mm larger than the bore, so UC205 will not go on it. An inch shaft needs an inch bore insert. FULI also makes UC205 with inch bores: UC205-14 for a 7/8 in shaft (22.23 mm), UC205-15 for a 15/16 in shaft (23.81 mm) and UC205-16 for a 1 in shaft (25.40 mm). The outside dimensions stay the same as the metric UC205.
| Dimension | Millimetres | Inches |
|---|---|---|
| Bore d | 25 mm | 0.9843 in |
| Outside diameter D | 52 mm | 2.0472 in |
| Inner ring width B | 34.1 mm | 1.3425 in |
| Outer ring width C | 17 mm | 0.6693 in |
Converted at 1 in = 25.4 mm and rounded to four decimals. The bearing itself is made to the millimetre sizes.
Mounting UC205 (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 UC205 the catalog gives 5,600 and 4,100 rpm for the two cases.
UC205 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 UC205 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 UC205
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 UC205
FULI supplies UC205 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 UC205 or UC205-14 for the inch bore.
Tools and guides for UC205
Typical applications
- Replacement inserts for UCP / UCF / UCFL housings
- Conveyors
- Agricultural machinery
FAQ
What shaft size does UC205 fit?
A 25 mm shaft (0.9843 in). For inch shafts the same size is made as UC205-14 (7/8 in), UC205-15 (15/16 in) and UC205-16 (1 in).
What is the difference between UC205 and UC206?
UC206 is the next size up, for a 30 mm shaft, with outside diameter D 62 mm (10 mm more) and inner ring width B 38.1 mm (4 mm more). Choose UC206 when the shaft is larger or the load is higher; the housings are not interchangeable.
Which housings fit the UC205 insert?
UCP205 (pillow block unit), UCF205 (square flange unit) and UCFL205 (oval flange unit) all use UC205. Order UC205 on its own to replace a worn insert in any of them.
What is the difference between UC205 and SB205?
Both fit a 25 mm shaft with a 52 mm outside diameter. UC205 has an inner ring 34.1 mm wide and SB205 27 mm. Both lock with set screws. Check that the narrower or wider ring clears the housing and the parts beside it on the shaft.
How much does UC205 weigh?
About 0.21 kg in FULI's catalog; 100 pieces weigh about 21 kg before packing.
Can UC205 be ordered as an insert only, or as a complete unit?
Both. UC205 can be supplied on its own as a replacement insert for an existing housing, or fitted in a housing such as the UCP205 pillow block or UCF205 square flange and supplied as a complete unit. Tell us which you need when you send the inquiry.