Ultra-High Vacuum

UNASIS delivers unique vacuum-compatible bearings when others can’t handle the pressure.

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UNASIS has a range of bearings specifically designed for use in ultra-high vacuum applications for pressures lower than 10−7 pascal, 10−9 mbar, ~10−9 torr. These unique environments require unique bearings that have strict material compatibility with low vapor pressures, minimal out-gassing, and high-temperature characteristics for the bake-out.

UNASIS’s specialist bearings for ultra-high vacuums have been designed and proven with remarkable success in a variety of applications including nano-precision position manipulator equipment, thermal mass flow controllers, and multi-stage mechanical goniometers. Designers have the ability to choose UNASIS vacuum-compatible materials such as ceramics and stainless steels with a number of cage options available including PTFE and PEEK with ball separators and full complement construction. Silicon Nitride ceramic balls can be utilized to eradicate the use of liquid lubrication. UNASIS provides various bearing assembles using the most advanced bearing steel and ceramic material combinations.


UNASIS UHV bearings can also be made non-magnetic and high-temperature resistant. Our thin-section bearings are light in weight and save space which allows designers to reduce the overall size of equipment. UNASIS offer speciality ultra-high vacuum greases and a choice of dry film lubricants when required, which are vacuum compatible (such as molybdenum disulphide and tungsten disulphide), including the market leading Cobra Solid Lubricant dry fill lubrication which is exclusive to UNASIS within the UK.


A UNASIS engineer can advise you on how to meet the design brief with an optimised material selection for a given application.


Experience supplying ultra-high vacuum bearings into the most extreme environments.

Speciality and custom designs capabilities to ensure each customer gets a solution that outperforms any other supplier

Utilization of the best materials and specialist lubrication options in the market

Stock availability or competitive delivery time of proprietary vacuum compatible bearings

Novel cage designs which drastically improve performance and lifetime characteristics

Full technical support with immediate response time


UNASIS Bearings has a vast network of distributors to reach all corners of the globe. No matter where you are, you will get the best service to go along with the best bearings.

Contact Us Today

For more information, please call us today on +44 (0) 1235 527 770 or email [email protected]

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