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NKE has developed SQ77 rolling bearings with built-in electrical insulation, which are suitable for applications in electric motors, generators and other electrical machines.

These rolling bearings provide reliable protection against current discharge and the resulting electrical corrosion.

NKE’s electrically insulated bearings are available in three versions: the SQ77 series, with an oxide ceramic insulation layer on the outer ring; the SQ77E series with an insulation layer on the inner ring; and the hybrid bearings of the SQ77B series, which feature ceramic rolling elements with theoretically infinite insulation resistance.

The SQ77 and SQ77E ceramic insulation is applied through plasma spraying and has a guaranteed dielectric strength of at least 1,000V AC or DC.

The bearings with outer ring insulation are available as cylindrical roller bearings and as deep-groove ball bearings in various designs, dimension series and radial clearance classes.

Compared to conventional bearings, electrically insulated bearings are more reliable in operation in electrical machinery due to their increased protection against electrical corrosion.

They are also more cost effective and reliable than a shaft or housing insulation, according to NKE.

The insulated bearings have the same key dimensions and technical properties as conventional bearings and are therefore 100 per cent interchangeable.

NKE AUSTRIA GmbH – a manufacturer of premium bearings – was founded in 1996 by a group of senior staff members of the former company Steyr Wälzlager. Within a decade, the NKE brand has emerged on the world bearing market as a significant alternative in the premium class.

We offer both standard and special bearings for all industrial applications as well as technical services, including product development, application engineering, consulting, documentation and training.

NKE’s core functions – such as engineering, product development, final processing of components, modular assembly, quality assurance, logistics, sales and marketing – are centralised at our headquarters in Steyr, Austria. The site is certified to ISO9001:2008,  ISO14001:2004 and OHSAS 18001. In April 2006, NKE was awarded the Austria Quality Seal in recognition of its high quality standards.

Today, NKE bearings are distributed in more than 60 countries through over 240 distributors and 18 international representative offices

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