UC206 Bearing Dimensions

UC206 compared with nearby sizes and housings

UC206 is a set-screw insert for a 30 mm shaft: outside diameter 62 mm, inner ring width 38.1 mm and outer ring width 19 mm.

The UC206 insert is the one fitted in UCP206 (pillow block unit), UCF206 (square flange unit) and UCFL206 (oval flange unit). Other inserts with the same size code are SB206 (30 × 62 × 30 mm) and SA206 (30 × 62 × 23.8 mm).

UC207 is the next larger size in the same series on this site: shaft d 35 mm (5 mm more), outside diameter D 72 mm (10 mm more) and inner ring width B 42.9 mm (4.8 mm more).

UC205 is the next smaller size in the same series on this site: shaft d 25 mm (5 mm less), outside diameter D 52 mm (10 mm less) and inner ring width B 34.1 mm (4 mm less).

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

UC206 weight, load ratings and speed

FULI's catalog gives about 0.32 kg for the insert, so 100 pieces of UC206 weigh about 32 kg before packing.

The catalog lists UC206 with a dynamic load rating of 19.5 kN and a static load rating of 11.3 kN. Its speed limits depend on the shaft tolerance: 4,700 rpm on a js7 or j7 shaft and 3,400 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.

UC206 dimensions in inches

The nearest common inch shaft size to the 30 mm bore of UC206 is 1-3/16 in (30.16 mm), 0.16 mm larger than the bore, so UC206 will not go on it. An inch shaft needs an inch bore insert. FULI also makes UC206 with inch bores: UC206-17 for a 1-1/16 in shaft (26.99 mm), UC206-18 for a 1-1/8 in shaft (28.58 mm), UC206-19 for a 1-3/16 in shaft (30.16 mm) and UC206-20 for a 1-1/4 in shaft (31.75 mm). The outside dimensions stay the same as the metric UC206.

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

Mounting UC206 (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 UC206 the catalog gives 4,700 and 3,400 rpm for the two cases.

UC206 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 UC206 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 UC206

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 UC206

FULI supplies UC206 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 UC206 or UC206-17 for the inch bore.

Tools and guides for UC206

• 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