Mounted Bearing Units for Supported Shaft Applications

Mounted bearing units combine an insert bearing and a housing into one ready-to-fit assembly. The current range contains Timken pillow-block, flange and take-up configurations across metric and imperial bores, with set-screw and eccentric-locking arrangements shown in the individual product titles. These units are used where a rotating shaft needs a defined mounting position; the correct choice depends on the complete mounting arrangement, not the bore alone.

Match the mounting style before comparing size

Start with the complete existing code and identify the housing pattern. UCP and UELP pillow blocks mount to a flat base. UCF and UELF four-bolt flange units mount to a vertical face. UCFL and similar two-bolt flange styles use a more compact oval pattern. UCT take-up units suit adjustable frames where belt or chain tension must be set. The catalogue also includes other Timken mounted-unit formats, so confirm the exact housing style rather than substituting from an abbreviation alone.

Check bore, locking method and dimensions

Record the shaft diameter in the stated unit system, the full bearing designation, bolt-centre spacing, centre height, housing orientation and the locking method. Set-screw and eccentric-collar locking arrangements need to suit the shaft and operating duty; they are not an automatic like-for-like substitute. Compare the manufacturer’s load, speed, sealing, lubrication and temperature guidance with the equipment requirement before ordering.

Assess the application, not only the part number

Conveyors, fans, pumps, agricultural machinery and workshop equipment can each place different radial, axial, vibration and contamination demands on a mounted unit. Inspect the shaft seat, mounting face, fasteners and seals when replacing a failed unit. If the housing is damaged, a replacement insert alone may not be appropriate. Installation, alignment, fastening torque and lubrication should follow the equipment and bearing manufacturer instructions.

Related bearing and housing ranges

For separate inserts, view Cartridge & Insert Bearings. For housing-only and assembly alternatives, compare Bearing Housings & Complete Units, Solid Housings, Pressed Metal Housings and Plummer Block Housings. Where locking hardware is required, see Locknuts & Washers.

Mounted Bearing Unit FAQs

What is the difference between UCP, UCF, UCFL and UCT mounted units?

Those prefixes generally indicate the housing arrangement: pillow block, four-bolt flange, two-bolt flange and take-up respectively. Dimensions, bore, locking method and compatible insert still need to be checked against the complete manufacturer designation.

Can I replace only the insert bearing in a mounted unit?

Some arrangements use a replaceable insert, but suitability depends on the housing condition and the specified bearing series. Inspect the housing, shaft and locking components before deciding whether an insert-only replacement is appropriate.

How do I match an imperial mounted bearing?

Use the full existing part code and confirm the listed imperial bore, housing style and locking method. Do not convert the bore alone and assume the housing, insert series or bolt pattern is the same.