UCF205 Bearing Dimensions

UCF205 compared with nearby sizes and housings

UCF205 is a square flange unit that holds the UC205 insert on a 25 mm shaft: flange length L 97 mm (JIS maximum) with M10 bolts.

The same 205 size is also made as UCP205 (pillow block unit, d 25 · H 36.5 · J 105 mm) and UCFL205 (oval flange unit, d 25 · L 130 · J 99 mm). All of them take the same UC205 insert, so a worn insert can be changed without changing the housing type.

UCF206 is the next larger size in the same series on this site: shaft d 30 mm (5 mm more), inner ring width B 38.1 mm (4 mm more) and bolt spacing J 83 mm (13 mm more).

UCF204 is the next smaller size in the same series on this site: shaft d 20 mm (5 mm less), inner ring width B 31 mm (3.1 mm less) and bolt spacing J 64 mm (6 mm less).

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

UCF205 weight, load ratings and speed

FULI's catalog gives about 0.9 kg for the complete unit, housing and insert together, so 100 pieces of UCF205 weigh about 90 kg before packing.

The catalog lists UCF205 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.

UCF205 dimensions in inches

The nearest common inch shaft size to the 25 mm bore of UCF205 is 1 in (25.40 mm), 0.4 mm larger than the bore, so UCF205 will not go on it. An inch shaft needs an inch bore insert. FULI also makes UCF205 with inch bores: UCF205-14 for a 7/8 in shaft (22.23 mm), UCF205-15 for a 15/16 in shaft (23.81 mm) and UCF205-16 for a 1 in shaft (25.40 mm). The outside dimensions stay the same as the metric UCF205.

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

Mounting UCF205 (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 UCF205 the catalog gives 5,600 and 4,100 rpm for the two cases.

The UC205 insert in UCF205 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 UCF205 down with M10 bolts at 70 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 UCF205

The insert in UCF205 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 UCF205

FULI supplies UCF205 as a complete unit, or the UC205 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 UCF205 or UCF205-14 for the inch bore.

Tools and guides for UCF205

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