UC208 Bearing Dimensions
UC208 is an insert bearing with a 40 mm bore, 80 mm outer diameter and 49.2 mm inner ring width. Fits P208/F208/FL208/T208 housings. Inch-bore suffixes. Quote.
UC208 specifications
| Bore d | 40 mm |
|---|---|
| Outside diameter D | 80 mm |
| Inner ring width B | 49.2 mm |
| Outer ring width C | 21 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 | 29.1 kN |
|---|---|
| Static load rating C0r | 17.9 kN |
| Limiting speed, shaft js7 / j7 | 3,600 rpm |
| Limiting speed, shaft h7 | 2,600 rpm |
| Weight | 0.64 kg — approx. |
Values from FULI's catalog; confirm for your application.
Inch bore versions
| Metric model | Inch model | Bore (in) | Bore (mm) |
|---|---|---|---|
| UC208 | UC208-24 | 1-1/2" | 38.10 |
| UC208 | UC208-25 | 1-9/16" | 39.69 |
Inch bore versions have the same outside diameter and ring widths as the metric UC208; only the bore is different. Write the inch designation on your order, for example UC208-24.
How to read the UC208 designation
| Segment | Meaning |
|---|---|
| UC | Insert bearing with set-screw locking and spherical outside diameter |
| 2 | 200 series (light duty) |
| 08 | Bore code 08 → 40 mm bore. ISO bore code (00–03 = 10/12/15/17 mm; 04 and above = code × 5 mm). |
UC208 interchange
UC208 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.
UC208 compared with nearby sizes and housings
UC208 is a set-screw insert for a 40 mm shaft: outside diameter 80 mm, inner ring width 49.2 mm and outer ring width 21 mm.
The UC208 insert is the one fitted in UCP208 (pillow block unit), UCF208 (square flange unit), UCFL208 (oval flange unit) and UCFC208 (round flange unit). Other inserts with the same size code are SB208 (40 × 80 × 34 mm) and SA208 (40 × 80 × 30.2 mm).
UC209 is the next larger size in the same series on this site: shaft d 45 mm (5 mm more), outside diameter D 85 mm (5 mm more) and inner ring width B 49.2 mm (the same).
UC207 is the next smaller size in the same series on this site: shaft d 35 mm (5 mm less), outside diameter D 72 mm (8 mm less) and inner ring width B 42.9 mm (6.3 mm less).
| Model | Type | Main dimensions | Weight (kg) |
|---|---|---|---|
| UC208 | insert bearing (this page) | 40 × 80 × 49.2 mm (d × D × B) | 0.64 |
| UC207 | insert bearing | 35 × 72 × 42.9 mm (d × D × B) | 0.47 |
| UC209 | insert bearing | 45 × 85 × 49.2 mm (d × D × B) | 0.68 |
| SB208 | insert bearing | 40 × 80 × 34 mm (d × D × B) | — |
| SA208 | insert bearing | 40 × 80 × 30.2 mm (d × D × B) | — |
| UCP208 | pillow block unit | d 40 · H 49.2 · J 137 mm | 1.9 |
| UCF208 | square flange unit | d 40 · J 102 mm (JIS) | 1.9 |
| UCFL208 | oval flange unit | d 40 · L 175 · J 144 mm | — |
| UCFC208 | round flange unit | d 40 · D2 145 · P 120 mm | 2 |
Dimensions in mm from the model pages; weight from FULI's catalog, — = not listed on this site.
UC208 weight, load ratings and speed
FULI's catalog gives about 0.64 kg for the insert, so 100 pieces of UC208 weigh about 64 kg before packing.
The catalog lists UC208 with a dynamic load rating of 29.1 kN and a static load rating of 17.9 kN. Its speed limits depend on the shaft tolerance: 3,600 rpm on a js7 or j7 shaft and 2,600 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.
UC208 dimensions in inches
The nearest common inch shaft size to the 40 mm bore of UC208 is 1-9/16 in (39.69 mm), 0.31 mm smaller than the bore, so UC208 would be loose on it. An inch shaft needs an inch bore insert. FULI also makes UC208 with inch bores: UC208-24 for a 1-1/2 in shaft (38.10 mm) and UC208-25 for a 1-9/16 in shaft (39.69 mm). The outside dimensions stay the same as the metric UC208.
| Dimension | Millimetres | Inches |
|---|---|---|
| Bore d | 40 mm | 1.5748 in |
| Outside diameter D | 80 mm | 3.1496 in |
| Inner ring width B | 49.2 mm | 1.9370 in |
| Outer ring width C | 21 mm | 0.8268 in |
Converted at 1 in = 25.4 mm and rounded to four decimals. The bearing itself is made to the millimetre sizes.
Mounting UC208 (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 UC208 the catalog gives 3,600 and 2,600 rpm for the two cases.
UC208 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 UC208 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 UC208
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 UC208
FULI supplies UC208 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 UC208 or UC208-24 for the inch bore.
Tools and guides for UC208
Typical applications
- Replacement inserts for UCP / UCF / UCFL housings
- Conveyors
- Agricultural machinery
FAQ
What shaft size does UC208 fit?
A 40 mm shaft (1.5748 in). For inch shafts the same size is made as UC208-24 (1-1/2 in) and UC208-25 (1-9/16 in).
What is the difference between UC208 and UC209?
UC209 is the next size up, for a 45 mm shaft, with outside diameter D 85 mm (5 mm more) and inner ring width B 49.2 mm (the same). Choose UC209 when the shaft is larger or the load is higher; the housings are not interchangeable.
Which housings fit the UC208 insert?
UCP208 (pillow block unit), UCF208 (square flange unit), UCFL208 (oval flange unit) and UCFC208 (round flange unit) all use UC208. Order UC208 on its own to replace a worn insert in any of them.
What is the difference between UC208 and SB208?
Both fit a 40 mm shaft with a 80 mm outside diameter. UC208 has an inner ring 49.2 mm wide and SB208 34 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 UC208 weigh?
About 0.64 kg in FULI's catalog; 100 pieces weigh about 64 kg before packing.
Can UC208 be ordered as an insert only, or as a complete unit?
Both. UC208 can be supplied on its own as a replacement insert for an existing housing, or fitted in a housing such as the UCP208 pillow block or UCF208 square flange and supplied as a complete unit. Tell us which you need when you send the inquiry.