FYH UC318-56 Insert Bearing, 3 1/2 in Bore, Set Screw, 190 mm O.D.

This page covers 8 FYH heavy duty UC300 series insert bearings (UC308-24 to UC320-64) with set screws, bore sizes 1 1/2 to 4 in (imperial). Choose the size from the drop-down: each variant has its own dimensions, load ratings and mass in the Model Details.

An insert bearing is the replaceable bearing inside a plummer block (pillow block), flange or take-up unit. UC type inserts have a wide inner ring and a spherical O.D., so they seat in a housing with a matching spherical bore.

Where this product is used

• Replacement insert for a plummer block or pillow block unit
• Replacement insert for flange and take-up housings with a matching spherical bore
• Conveyor rollers, drive shafts and idler stations
• Fans, blowers and pumps
• Agricultural, construction and general industrial machinery

Features

• Wide inner ring with set screws (FYH Bullet Point type) spaced 120 degrees apart to lock the insert on the shaft
• Spherical O.D. with a grease groove and grease holes, so the insert can be re-lubricated when it is in a housing
• Rubber seal with metal slinger, supplied pre-lubricated with FYH grease
• Basic dynamic load rating Cr 40.7 to 173 kN and static rating C0r 24 to 141 kN (see the Model Details for each size)

Key specifications

Available sizes

Selecting the right option

Every size on this page has an imperial (inch) bore. The drop-down shows the shaft size in inches; the Model Details give the bore in mm with the inch size in brackets. Metric shafts need the metric version of the insert.

Set screw (grub screw) inserts lock to the shaft with set screws spaced 120 degrees apart, so they suit a plain shaft of the matching bore size.

Fitting and use

Check the load and speed against the catalogue figures in the Model Details before ordering, and apply a suitable safety factor. The allowable rotating speed in the catalogue is a standard value: it falls to 80% for units fitted with covers, and a loose fit between shaft and inner ring reduces it further.

Tighten the set screws once the insert is in position on the shaft.

Match the insert to a housing with the same size number: the spherical O.D. seats in a matching spherical housing bore.

If you are unsure which insert suits a shaft and housing, send AIMS the part numbers or sizes and we will confirm the fit.

Related products

The catalogue unit tables pair these inserts with these FYH housings (matched by size number): P300 series pillow block housings (8 of 8 sizes), F300 series four bolt flange housings (8 of 8 sizes), FL300 series two bolt flange housings (8 of 8 sizes) and T300 series take-up housings (8 of 8 sizes). Related FYH insert bearing pages: UC300 heavy duty insert bearings, 25 to 140 mm bore (metric), UC200 insert bearings, 12 to 90 mm bore (metric), UC200 insert bearings, 1/2 to 3 1/2 in bore (imperial), UCX medium duty insert bearings, 25 to 60 mm bore (metric) and UCX medium duty insert bearings, 1 to 1 3/4 in bore (imperial).