Pillow block bearing is a kind of bearing that looks like a small ball bearing that has a casting pedestal or a pressed steel plate and a double seal. If you will look closely inside it, you will see that the pillow block bearings is very much the same as the other kinds of bearing like the deep groove ball bearings. The only difference is that is you will look closely at the outer ring of the pillow block bearings, you can see that it has section balls which is best use with the concave part of the bearing pedestal.

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

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