UCFL208 Bearing Dimensions

UCFL208 compared with nearby sizes and housings

UCFL208 is a oval flange unit that holds the UC208 insert on a 40 mm shaft: flange length L 175 mm and flange width H 100 mm with M14 bolts.

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 UCFC208 (round flange unit, d 40 · D2 145 · P 120 mm). All of them take the same UC208 insert, so a worn insert can be changed without changing the housing type.

UCFL207 is the next smaller size in the same series on this site: shaft d 35 mm (5 mm less), inner ring width B 42.9 mm (6.3 mm less), length L 161 mm (14 mm less) and bolt spacing J 130 mm (14 mm less).

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

UCFL208 load ratings

FULI's catalog has no load rating line for UCFL208 itself, so none is given here. The ratings of the UC208 insert are on its own page. Ask us and we send the figures with the quotation.

UCFL208 dimensions in inches

The nearest common inch shaft size to the 40 mm bore of UCFL208 is 1-9/16 in (39.69 mm), 0.31 mm smaller than the bore, so UCFL208 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 UCFL208 (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 UC208 insert in UCFL208 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 UCFL208 down with M14 bolts at 144 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 UCFL208

The insert in UCFL208 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 UCFL208

FULI supplies UCFL208 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 UCFL208.

Tools and guides for UCFL208

• 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