THK’s LM Guide Actuator Caged Ball LM Guide Actuator SKR20 with Long Nut Block A/B SERIES represents a sophisticated integration of linear motion technology designed for high-precision, high-load applications. This system combines a precision-ground LM guide with a ball screw actuator, featuring a unique caged ball design that enhances performance and longevity. The SKR20 model, in particular, is engineered with a compact profile while maintaining robust load capacity, making it suitable for space-constrained industrial environments. The long nut block, available in A and B series variants, provides extended contact with the ball screw, distributing loads evenly and reducing wear for sustained accuracy over time.

Key technical features include the caged ball mechanism, which separates and retains balls within the LM guide and actuator to minimize friction, noise, and heat generation. This design prevents ball-to-ball contact, reducing operational vibration and allowing for smoother, more consistent motion. The LM guide incorporates precision-racedway grooves and high-grade steel construction, ensuring minimal deflection under heavy loads. The ball screw actuator boasts high lead accuracy and efficiency, with preloaded nuts to eliminate backlash and enhance positional repeatability. Additionally, the long nut block variants offer optimized preload settings—Series A for moderate loads and Series B for higher rigidity and load capacity—enabling customization based on application demands. Sealing systems are integrated to protect against contaminants like dust and moisture, extending service life in harsh conditions.

Performance advantages of this actuator system are substantial, starting with its ability to handle combined loads—radial, reverse radial, and moment loads—with high stiffness and stability. The caged ball design contributes to a longer maintenance interval by reducing lubricant depletion and wear, while the low friction coefficient allows for higher speeds and accelerations without sacrificing precision. Energy efficiency is improved due to reduced power requirements for motion initiation and maintenance. In terms of durability, the hardened steel components and corrosion-resistant treatments ensure reliable operation in demanding environments, with noise levels kept low for operator comfort and compliance with industrial standards.

Typical applications span across industrial machinery, automotive systems, and precision equipment. In industrial automation, it is commonly used in CNC machining centers for tool positioning, robotic arm articulation, and pick-and-place systems where high accuracy and repeatability are critical. The automotive industry employs these actuators in assembly lines for precise component handling, welding robots, and testing equipment that requires robust performance under cyclic loads. For precision equipment, such as semiconductor manufacturing tools, medical devices, and optical alignment systems, the SKR20 actuator provides the sub-micron level accuracy necessary for sensitive operations. Its versatility also extends to packaging machinery, where smooth linear motion ensures efficient product handling and labeling processes. By delivering a blend of precision, durability, and adaptability, THK’s LM Guide Actuator SKR20 with Long Nut Block A/B SERIES supports enhanced productivity and reliability in advanced mechanical systems.