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This product brief provides only a general view of the SMR range for standard housings and will facilitate the task of the designer in selecting the right housings for most common applications.

Many other types of bearing housings not listed here and variants of the listed housings adapted to customer demands can also be supplied.

For application where standard housings are not suitable, SMR can supply special housings of grey cast iron, spheroidal graphite cast iron and cast steel, e.g for conveyor equipment, rotary kilns, drums, tube mills, convertors, large electrical machines, paper making machines and rail vehicles. Further details of appropriate housings for special purposes will be supplied on request.
General information
Standard SMR bearing housings incorporating the appropriate rolling bearings are economic replaceable bearing units and normally require little maintenance.
Housings bearing seating
The bearing seating in the housings in machined to specific industrial tolerances so as to provide a perfect fit of the bearing outer ring and generally the seating width is such that the bearing has axial freedom. Slight axial positioning errors in mounting and thermal elongation of the shaft can therefore be accommodated within the housing.
Support surface
To ensure reliable function and long operational life of the bearing, the surface of the supporting components should be machined to a surface roughness of Ra = 12.5 micrometer. For flatness IT7 is recommended.
Axial Location
In most cases, axial location of bearings in the housings is achieved by inserting the locating rings, as specified in the housing catalogs. Housings where locating rings are not used, have the bearing seating machined to the appropriate width. The suffix F is used to indicate a locating bearing housing and suffix L a non-locating bearing housing.
Lubrication and maintenance
It is necessary to lubricate rolling bearings to prevent metallic contact between rolling elements, raceways and cage.

The choice of lubricant depends primarily on the temperature range and operating speeds for which it is required.

There are two primary ways of lubrication:

Grease lubrication – Generally used where bearings operate under normal conditions.

Oil lubrication – For high speeds & high temperatures, SMR offers specialized SOFN range of housings for oil lubrication purpose.