THK’s LM Stroke Model ST…UU SERIES represents a sophisticated line of linear motion systems engineered for applications demanding precise, long-stroke movement with exceptional rigidity and minimal maintenance. These systems are fundamentally based on the LM Stroke mechanism, a technology where a carriage, containing recirculating balls, travels along a precision-ground shaft that also functions as the raceway. This integrated design eliminates the need for a separate rail, resulting in a more compact and space-saving system ideal for installations where envelope constraints are critical. The ST…UU models are characterized by their robust construction, utilizing high-carbon chromium bearing steel for the shaft, which is induction hardened to a depth of approximately 1.5mm and precision ground to a surface finish of 0.2 μm Ra or better. This ensures superior load capacity and an extended service life, even under harsh operating conditions.

Key technical features of this series include its high load ratings in all directions—radial, reverse-radial, and lateral—enabled by a optimized ball circuit design and a rigid, single-piece carriage housing. The incorporation of high-grade seals and wipers provides effective defense against contaminants like dust, chips, and moisture, making the units highly suitable for dirty or washdown environments. A significant performance advantage is the remarkably low coefficient of friction and smooth, consistent motion, which translates directly into reduced drive power requirements, higher positional accuracy, and improved repeatability. The pre-loaded design minimizes backlash and deflection, ensuring stability and precision during high-speed traversal and at stopping points. Furthermore, the standardized design and pre-assembled nature of the ST…UU SERIES simplify installation, reducing machine assembly time and cost.

Typical applications for the LM Stroke ST…UU SERIES are found across a wide spectrum of demanding industries. In industrial automation and machinery, these components are integral to the long-axis travel of gantry robots, automated transfer lines, and the precise positioning stages of CNC machining centers and laser processing equipment. The automotive manufacturing sector utilizes them in welding robot seventh-axis slides, precision assembly stations, and parts handling systems where durability and precision are non-negotiable. Within the realm of precision equipment, these linear systems are deployed in semiconductor and LCD manufacturing apparatus, precision measuring instruments, and medical device automation, where their smooth motion and cleanliness are paramount. The combination of long-stroke capability, high rigidity, and proven reliability makes the THK LM Stroke ST…UU SERIES a foundational component for engineers designing advanced machinery that requires dependable, high-performance linear motion.