UCF206 Bearing Dimensions

UCF206 compared with nearby sizes and housings

UCF206 is a square flange unit that holds the UC206 insert on a 30 mm shaft: flange length L 108 mm with M10 bolts.

The same 206 size is also made as UCP206 (pillow block unit, d 30 · H 42.9 · J 121 mm) and UCFL206 (oval flange unit, d 30 · L 148 · J 117 mm). All of them take the same UC206 insert, so a worn insert can be changed without changing the housing type.

UCF207 is the next larger size in the same series on this site: shaft d 35 mm (5 mm more), inner ring width B 42.9 mm (4.8 mm more), length L 117 mm (9 mm more) and bolt spacing J 92 mm (9 mm more), and it takes M12 bolts instead of M10.

UCF205 is the next smaller size in the same series on this site: shaft d 25 mm (5 mm less), inner ring width B 34.1 mm (4 mm less) and bolt spacing J 70 mm (13 mm less).

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

UCF206 load ratings

FULI's catalog has no load rating line for UCF206 itself, so none is given here. The ratings of the UC206 insert are on its own page. Ask us and we send the figures with the quotation.

UCF206 dimensions in inches

The nearest common inch shaft size to the 30 mm bore of UCF206 is 1-3/16 in (30.16 mm), 0.16 mm larger than the bore, so UCF206 will not go on it. An inch shaft needs an inch bore insert. FULI also makes UCF206 with inch bores: UCF206-17 for a 1-1/16 in shaft (26.99 mm), UCF206-18 for a 1-1/8 in shaft (28.58 mm), UCF206-19 for a 1-3/16 in shaft (30.16 mm) and UCF206-20 for a 1-1/4 in shaft (31.75 mm). The outside dimensions stay the same as the metric UCF206.

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

Mounting UCF206 (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 UC206 insert in UCF206 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 UCF206 down with M10 bolts at 83 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 UCF206

The insert in UCF206 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 UCF206

FULI supplies UCF206 as a complete unit, or the UC206 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 UCF206 or UCF206-17 for the inch bore.

Tools and guides for UCF206

• 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