Introduction
The document discusses the advancements in bearings for screw drives, specifically focusing on the X-life quality bearings by Schaeffler. These bearings are designed to offer longer life and higher speeds, making them suitable for dynamic operating conditions.

Specifications
The bearings, particularly the ZKLN and ZKLF series, are double row axial angular contact ball bearings with a 60° contact angle. They are designed to handle high axial and radial forces with high precision and tilting rigidity. The bearings are sealed on both sides to protect against contamination and are typically maintenance-free due to their initial grease application.

New X-life Design
Schaeffler has enhanced these bearings using advanced production technologies, optimizing the contact face between rolling elements and raceway. This results in reduced stress, lower friction, and decreased operating temperatures, leading to improved energy efficiency and reduced operating costs.

Performance Improvements
The X-life bearings offer a higher basic dynamic load rating, approximately 10% higher than previous designs, and an increased basic rating life (L10) by up to 33%. This allows for either a longer operating life or the ability to handle higher loads under the same conditions.

Heat Treatment and Speed
The bearings undergo special heat treatment, enhancing resistance to solid particles and mixed friction, thus extending the grease operating life. The reduced friction allows for significantly higher limiting speeds, up to 60% more than standard bearings, making them suitable for high-speed applications.

Availability
The X-life versions of the ZKLN and ZKLF series will be available from early 2014. For specific delivery dates, contact Schaeffler.

Contact Information
For further inquiries, contact Gerald Nonnast at Schaeffler Technologies, Herzogenaurach, Germany.