NSK bearing units

The NSK bearing unit is a combination of a radial ball bearing, seal, and a housing of high-grade cast iron or pressed steel, which comes in various shapes. The outer surface of the bearing and the internal surface of the housing are spherical, so that the unit is self-aligning. The inside construction of the NSK ball bearing for the unit is such that steel balls and retainers of the same type as in series 62 and 63 of the deep groove ball bearing are used. A duplex seal consisting of a combination of an oil-proof synthetic rubber seal and a slinger is provided on both sides.

Depending on the type, the following methods of fitting to the shaft are employed:

NSK bearing units
  • The inner ring is fastened onto the shaft in two places by set screws.
  • The inner ring has a tapered bore and is fitted to the shaft by means of an adapter.
  • In the eccentric locking collar system the inner ring is fastened to the shaft by means of eccentric groove provided at the side of the inner ring and on the collar.

NSK pillow blocks

NSK Pillow blocks with bearings mounted in rigid housings of simple construction are the most common bearing units. They are extensively used for various kinds of transmission equipment and machinery.

NSK Square Flanged Units

These NSK bearing housings have square flange which can be easily attached to a machine with four bolts.
With its simple mounting face, this bearing unit is widely used.

NSK Oval Flanged Units

These NSK bearing housings have oval flanges which can be easily installed onto a machine with two bolts.
This type of bearing unit is suitable where mounting space is limited or where it is necessary to minimize the distance between shafts. The distance between bolt holes of an oval flange type is generally equal to the distance between bolt holes diagonal position of square flange type.

NSK Ball Bearings Set Screw Type

This is the special bearing, designed for bearing units. There are many types according to installation ways etc.

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Related numbers

NSK UCP204D1 bearings
shaft size:20mm, Bolt size:M10, Total lenght:127mm
NSK UCP205D1 bearings
shaft size:25mm, Bolt size:M10, Total lenght:140mm
NSK UCP208D1 bearings
shaft size:40mm, Bolt size:M14, Total lenght:184mm
NSK UCP209D1 bearings
shaft size:45mm, Bolt size:M14, Total lenght:190mm
NSK UCP210D1 bearings
shaft size:50mm, Bolt size:M16, Total lenght:206mm
NSK UCP211D1 bearings
shaft size:55mm, Bolt size:M16, Total lenght:219mm
NSK UCP324D1 bearings
shaft size:120mm, Bolt size:M33, Total lenght:570mm
NSK UCP326D1 bearings
shaft size:130mm, Bolt size:M33, Total lenght:600mm

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