Product Details Supplier Info More products

NSK’s SpaceA range of bearings has solved a problem of premature failures of stainless-steel bearings used in the manufacture of carbon graphite and composite materials for aerospace applications.

Operating in a solution of ammonium bicarbonate, the stainless-steel bearings were failing after about six weeks; however, the SpaceA replacements have been operating for eight-months without problems, providing significant savings for the manufacturer.

The SpaceA bearings are situated at both ends of five rollers, over which the carbon-fibre material passes in a surface-treatment process before being submersed in the bath of ammonium bicarbonate.

This is an arduous application for bearings, as illustrated by the fact that the 10 stainless-steel 6205 bearings that were used previously were failing and requiring replacement every six weeks.

In addition, analysts calculated that the frequent replacement was costing far too much in lost production time.

Keen to remove these costs and improve productivity, the manufacturer contacted NSK to enquire about the company’s cost-saving programme and to find out how the technical consultancy aspect of the programme might be able to help.

Following the enquiry, NSK engineers visited the manufacturer’s plant to assess the application.

Subsequently, they recommended replacing the stainless-steel bearings with units from NSK’s SpaceA series for special environments.

The SpaceA series is a range of bearings, ball screws and linear guides that provides high performance and reliability under all types of demanding operating conditions including: super-clean, vacuum, non-magnetic, corrosive, high/low temperature, nuclear and high speed.

Products in the series meet a wide range of technical requirements with a programme of high-performance materials, surface finishes and specially developed lubricants, including solid types.

The SpaceA bearings recommended for the surface treatment application were 6205 units with martensitic stainless-steel inner/outer rings and balls; the latter supplied with an MoS2 solid lubricant coating.

In addition, the cage of the bearings is self-lubricating and the bearings are provided with shields of Austenitic stainless steel.

Initially, two SpaceA bearings were fitted to one of the rollers to assess the performance.

After a trial period of three months, the customer was confident enough to replace the remaining eight bearings.

These are still operating successfully after eight months, and subsequent orders for SpaceA bearings have been placed for an alternative machine.


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.

View full profile