Press Release

NSK Develops ROBUSTDYNA™ Ultra-High Speed High Load Capacity Angular Contact Ball Bearings

NSK Ltd. has developed ROBUSTDYNA, a new series of bearings that enables highly versatile machining by delivering excellent performance across both roughing and finishing machining operations. NSK will exhibit this series for the first time at JIMTOF 2020 Online (The 30th Japan International Machine Tool Fair), which will be held from November 16-27, 2020.

工作機械主軸用 高負荷容量・超高速アンギュラ玉軸受『ROBUSTDYNA™(ロバストダイナ™)』

Development Background

In recent years, machine tools such as machining centers have been required to meet the demands for heavy cutting in response to increasing utilization of difficult-to-cut materials such as titanium, ceramics, and composite materials, as well as for long-term, stable operation under low-maintenance or maintenance-free conditions. In order to meet these demands, machine tools have been faced with the challenge of increasing load capacity to achieve both heavy cutting and high-speed operation performance.


1. High load capacity
By optimizing the bearing's internal design, such as the use of larger diameter balls, the load capacity has been increased by 15% and fatigue life (dynamic load rating) has been extended by up to three times compared to conventional products*1. This makes heavy cutting possible and can achieve reductions in machining time.

*1 “Conventional products” refers to NSK's current Robust Series (SHX steel type).

2. High impact resistance
The internal design has been optimized to increase impact resistance (static load rating) by 30% compared to conventional products, reducing the risk of bearing damage in the event of a collision (impact). This contributes to the long-term, stable operation of the spindle (avoiding unplanned downtime).
3. Ultra-high speed performance
The use of NSK's proprietary SHX steel, which has excellent heat and wear resistance, has enabled NSK to achieve the same ultra-high speed performance of 3 million dmN*2 as conventional products. In addition to heavy cutting, this enables the spindle to perform at the ultra-high speeds required for finishing.

*2 dmN: The mean value of bearing pitch diameter (dm) in millimeters multiplied by rotational speed (N).


This product contributes to reducing machining time and enables highly versatile machining by achieving excellent performance across both roughing and finishing. High impact resistance is ideal for heavy cutting and also contributes to long-term stable operation and improved productivity (avoiding unplanned downtime).

工作機械主軸用 高負荷容量・超高速アンギュラ玉軸受『ROBUSTDYNA™(ロバストダイナ™)』


The ROBUSTDYNA is ideal for machine tools performing heavy cutting and highly versatile machining operations, such as machining centers producing aircraft and automotive parts. Moving forward, NSK will continue to expand the ROBUSTDYNA Series lineup.

About NSK

NSK began its journey manufacturing the first bearings in Japan in 1916, and has since developed into a global organization researching, designing, and manufacturing Motion & Control™ solutions essential for mobility and industrial applications. NSK is the top supplier of bearings in Japan and is the third largest supplier in the world by market share.

Our responsive products and technologies enhance automotive performance and industrial productivity while reducing energy consumption to unprecedented low levels. In the early 1960s, we set our sights outside Japan and have established over 200 business locations in 30 countries alongside a vast network of joint ventures and partnerships in all corners of the world.

NSK Corporate Philosophy

NSK contributes to a safer, smoother society and helps protect the global environment through its innovative technology integrating Motion & Control. As a truly international enterprise, we are working across national boundaries to improve relationships between people throughout the world.