A pillow block, also known as a plummer block[1] or bearing housing, is a pedestal used to provide support for a rotating shaft with the help of compatible bearings & various accessories. Housing material for a pillow block is typically made of cast iron or cast steel.

 

Pillow blocks are usually referred to the housings which have a bearing fitted into them & thus the user need not purchase the bearings separately. Pillow blocks are usually mounted in cleaner environments & generally are meant for lesser loads of general industry. These differ from "plummer blocks" which are bearing housings supplied without any bearings & are usually meant for higher load ratings & corrosive industrial environments. However the terms pillow-block & plummer-block are used interchangeably in certain parts of the world.

 

The fundamental application of both types is the same which is to primarily mount bearings safely enabling their outer ring to be stationary while allowing rotation of the inner ring. The housing is bolted to a foundation through the holes in the base. Bearing housings are either split type or unsplit type. Split type housings are usually two piece housings where the cap and base can be detached, while certain series are one single piece housings. Various seals are provided to prevent dust and other contaminants from entering the housing. Thus the housing provides a clean environment for the expensive bearings to freely rotate, hence increasing their performance and duty cycle.

 

Bearing housings are usually made of grey cast iron. However various grades of metals can be used to manufacture the same.ISO 113 specifies internationally accepted dimensions for plummer blocks.Manufactures: World renowned manufacturers for plummer blocks are SKF,FAG,NTN,SMR,NSK,AXL...etc

 

Pillow blocks, the most commonly used type of mounted units, are designed to provide shaft support where the mounting surface is parallel to the shaft axis. The bolt holes are usually slotted for adjustment during mounting. Pillow blocks are supplied in a variety of configurations. Pressed steel pillow block bearings are also available for light-duty applications.Check out our selection of high quality pillow block bearings listed below. We are always updating and adding sizes and styles. So be sure to check the pillow block bearing page often. Also check out our insert bearing page for the inserts that fit in our pillow blocks, two bolt flange bearings and four bolt flange bearings.