UCFC208 Bearing Dimensions

UCFC208 compared with nearby sizes and housings

UCFC208 is a round flange unit that holds the UC208 insert on a 40 mm shaft: dimension J 84.8 mm, dimension D2 145 mm and dimension P 120 mm.

The same 208 size is also made as UCP208 (pillow block unit, d 40 · H 49.2 · J 137 mm), UCF208 (square flange unit, d 40 · J 102 mm (JIS)) and UCFL208 (oval flange unit, d 40 · L 175 · J 144 mm). All of them take the same UC208 insert, so a worn insert can be changed without changing the housing type.

Dimensions in mm from the model pages; weight from FULI's catalog, — = not listed on this site.

UCFC208 weight, load ratings and speed

FULI's catalog gives about 2 kg for the complete unit, housing and insert together, so 100 pieces of UCFC208 weigh about 200 kg before packing.

The catalog lists UCFC208 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.

UCFC208 dimensions in inches

The nearest common inch shaft size to the 40 mm bore of UCFC208 is 1-9/16 in (39.69 mm), 0.31 mm smaller than the bore, so UCFC208 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.

Converted at 1 in = 25.4 mm and rounded to four decimals. The bearing itself is made to the millimetre sizes.

Mounting UCFC208 (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 UCFC208 the catalog gives 3,600 and 2,600 rpm for the two cases.

The UC208 insert in UCFC208 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 UCFC208 down with the mounting bolts 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 UCFC208

The insert in UCFC208 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 UCFC208

FULI supplies UCFC208 as a complete unit, or the UC208 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 UCFC208.

Tools and guides for UCFC208

• Insert bearing sizes: UC, SB and SA
• Pillow block bearing sizes
• Flange bearing sizes
• Pillow block bearing cross reference
• Bearing lubrication basics
• All bearing products and model pages