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Pillow block bearing units for industry application

Pillow block bearing units for industry application

  • 2020-05-19
Pillow block, also named plummer block or bearing housing, different brand called different name for this industrial part. Europe bearing manufacturer call Plummer block, FAG named Plummer block and pillow block, NSK and NTN say Pillow block, it is a pedestal used to provide support for a rotating shaft with the help of compatible bearings & various accessorie s,the pillow block housing material is typically made of cast iron or cast steel.


Pillow blocks usually refer to housings which have a bearing fitted into them and thus the user need not purchase the bearings separately. Pillow blocks are usually mounted in cleaner environments and generally are meant for lesser loads of general industry. These differ from “plummer blocks” which are bearing housings supplied without any bearings and are usually meant for higher load ratings and corrosive industrial environments.


However the terms NSK Pillow block bearing units and plummer block are used interchangeably in certain parts of the world.


Pillow block bearing usually working with pillow block housing, FAG UC200, UC300 Series pillow block bearing, NSK UC series NSK Pillow block bearing units,
and also some bearings working with plummer blocks like spherical roller bearings, self-aligning ball bearing, cylindrical roller bearings, deep groove ball bearings, Carb Toroidal roller bearing, The fundamental application of both types is the same which is to 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.


Pillow block bearing units


NSK Pillow blocks are completely interchangeable with SKF Plummer block housing, FAG plummer block bearing housings, NTN pillow block housings, Now let me show some applications of NSK Plummer blocks.


General industry: Conveyors, Roller tables, Fans and blowers


Processing industry: Crushers, hammer mills, Ball and rod mills, decanters, Kilns


Paper making equipments: Dryer cans, jack ladders, chip conveyers, pumps, pulpers, breast rolls, press rolls


Steel mills: Runout tables, strip processing lines


Part numbering system of NSK plummer blocks


SAF: Two or four bolt pillow block, cast iron


SDAF: Four bolt heavy duty type pillow block, cast iron


SAFS: Two or four bolt pillow block, cast steel


FSAF: Four bolt pillow bl ock, cast iron


FSAFS: Four bolt pillow block, cast steel


SDAFS: Four bolt heavy duty pillow block, cast steel


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