Mounted Units

Mounted bearing units are available with plain, ball and roller bearings. Mounted bearing units are available off-the-shelf and eliminate the need for the OEM to have to manufacture a housing. Mounted bearings are available in inch and metric sizes ranging from ½” to 16”. The critical information needed to select or identify a mounted bearing is shaft size, base to center height, and bolt spacing. Knowing the load characteristics, speed, mounting limitations, and environment will also assist in selecting the right mounted bearing type. Mounted bearings are offered in many varieties. The most common is the two or four bolt "pillow block", which mount vertically. Pillow blocks come in high and low shaft heights and also are offered with different bases such as the tapped base units when there are space limitations. Two, three and four bolt flanged mounted bearings, which bolt horizontally, and flanged cartridge varieties are also very popular. Mounted bearings are also available as take up units, popular on conveyors where adjustment is needed.

Most ball type mounted bearings utilize a wide inner ring with an integral locking collar device. There are two common types: the setscrew collar and the eccentric collar. Either type accommodates a slip fit over commercially ground shafting. Mounted bearings with setscrew locking devices have two setscrews threaded into drilled and tapped holes in an extension of the bearing's inner ring. An alternate mounted bearing design has a concentric collar that slips over the ring extension. The setscrews are then threaded into the collar, and contact the shaft through untapped holes in the collar extension.

Mounted bearings with eccentric locking collars use an extended inner ring of the bearing that contains a channel eccentric to the shaft, and a matching channel in a collar that fits over the inner ring extension. This mounted bearing type is secured to the shaft by rotating the collar relative to the inner ring. Mounted bearing manufacturers agree that eccentric locking collars should not be used for bidirectional applications. Most mounted ball bearing units have spherical ODs. This compensates for angular shaft misalignment. The bearing may also have a cylindrical OD with a slip-fit in the mounting to allow axial freedom. Mounted bearing units are also available with cylindrical, spherical and roller bearings. Mounted roller bearings are often used for heavier-duty applications than ball bearings, and therefore may require more rigid locking to the shaft. There are numerous mounted bearing manufacturers.

Mounted bearings are often differentiated by there features and benefits, and are available in a wide price range depending on characteristics such as sealing, locking collars, housing strength, insert bearing, lubrication and steel quality. Please contact Bearing Service to help assist you in selecting the right mounted bearing for your application.

Here is a list of Manufacturers / Brands that we represent:

• Regal PTS (Browning, Sealmaster)
• Baldor (Dodge)
• Timken (Fafnir)
• Rexnord (Linkbelt, MB)
• RBTech
• NTN
• Schaeffler (INA)
• NSK
• P.T. International
• Peer
• FYH
• AMI
• FIT
• SNR
• SKF
• Koyo
• Boston Gear
• SKF