NSK Develops Ultra-Smooth Motion Technology for NSK Linear Guides™

NSK developed the ultra-smooth motion technology by optimizing the shape of the ball circulation path and suppressing irregular “micro-stutters” (brief stuttering or jerking in motion due to localized friction fluctuations) with elastic rolling elements. NSK Linear Guides with ultra-smooth motion technology are ideal for equipment requiring highly consistent smooth motion, such as inspection and measurement equipment. The technology also benefits applications requiring vertical operation and other mounting positions where operating characteristics tend to deteriorate. In addition, linear guides with ultra-smooth motion technology are dimensionally interchangeable with NH/NS Series linear guides, so units currently in use (e.g. older models) can be replaced without any design changes.

Mechanism of Ultra-Smooth Motion Technology

A significant cause of micro-stutters in linear guides is the balls colliding with each other in the curved sections of the ball circulation path. We optimized the design of the circulation path and included elastic rolling elements in a special configuration to reduce conflict between balls (prevent an increase in friction due to contact between balls) and achieve ultra-smooth motion


NSK linear guides with ultra-smooth motion technology largely eliminate micro-stutters and have improved operating characteristics contributing to higher accuracy of equipment through smooth motion with no feed speed irregularities.

Fig. 1 Mechanism of Ultra-Smooth Motion


Fig. 2 Evaluation of Slide Motion Smoothness

Supported Models

  • Ultra-smooth motion option is now available for general-purpose NH/NS Series Linear Guides
  • Sizes: NH 15, 20, 25 NS 15, 20, 25, 30
  • 28 variations including different slider lengths and types
  • Compatible with a wide variety of options such as NSK K1-L lubrication unit, stainless steel configurations, and surface treatments.