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NSK has developed the VS series of long-life spherical roller bearings for vibrating machinery used in the mining, quarrying and construction industries.

The VS series bearings are said to offer a service life more than twice as long as current designs, enabling vibrating machinery to operate for longer, continuous periods, while maintaining high levels of reliability.

They have been developed to meet the needs of markets where many mining and quarrying facilities are operated under demanding conditions 24 hours per day.

Under these conditions, any interruptions to the operation of vibration-intensive machinery can adversely affect production.

As a result, longer service life and higher reliability are key attributes for bearings used in this type of machinery.

NSK’s long-life, spherical roller bearings are designed specifically for use in vibration-intensive machinery.

They provide product enhancements that meet market demands for improved service life and reliability.

The longer service life of the VS series of spherical roller bearings is the result of a special surface finish on the raceway of the outer ring, which is used to control the slippage of the rollers.

The curvature factor between the raceway and spherical roller has also been optimised.

This reduces slippage and the accompanying initiation stress between the roller and the contact surfaces of the outer and inner ring raceways.

The result of these design initiatives is a reduction in raceway damage over the life of the bearings due to surface fatigue, giving a service life more than twice that of current bearing types.

With its VS spherical roller bearing design, NSK has also stabilised load distribution by controlling radial internal clearance and bearing dimensional tolerance factors.

The internal radial clearance of the VS series is set at 2/3 that of ISO-standard bearings, while the bearing outer diameter and bore diameter tolerances are 1/2 that of ISO-standard bearings.

NSK is offering the VS series of spherical roller bearings in 22 sizes, with outer diameters ranging from 90mm to 400mm.


NSK, a global leader in motion and control products, has developed and continuously upgrades four core technologies: tribology, material engineering, analysis technology and mechatronics, to provide the platform for the company’s innovative product developments. This technology platform provides the basis for the design of NSK’s rolling bearings, automotive components and precision parts. In addition, by integrating these advanced technologies, NSK is able to respond quickly and effectively to customer requirements across all key sectors.

NSK is a driver of new technology developments, with a full line-up of products spanning general industrial, automotive and precision parts industries. These include bearings for mechanical and electrical machinery, IT and aftermarket; innovative automotive products such as electric power steering (EPS) automatic transmission components, steering columns and other steering related products; and precision linear motion components such as linear guides, ballscrews, X-Y tables, mechatronic products and Megatorque motors.

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