THK’s LM Guide SRG, SRG-G, and SRG-GV Series represent a significant advancement in linear motion technology, specifically engineered as full roller type guides to deliver ultra-high rigidity and exceptional load capacity. These systems utilize cylindrical rollers in place of traditional ball bearings, arranged in a full-complement configuration that maximizes the number of rolling elements in contact with the raceway. This design fundamentally enhances stiffness and distributes loads more uniformly, making these guides ideally suited for applications demanding extreme precision under heavy loads and high moments.

The technical features of the SRG Series are defined by their robust construction and innovative roller management. The core component is the LM rail and block, which incorporates a retainer to prevent roller-to-roller contact, ensuring smooth, low-noise operation and extended service life by minimizing wear and friction. The SRG-G and SRG-GV models further refine this concept. The SRG-G variant is a general-purpose ultra-high rigidity model, while the SRG-GV integrates a grease reservoir system within the LM block. This built-in reservoir automatically supplies lubricant to the rolling contact surfaces, significantly extending lubrication intervals, reducing maintenance downtime, and enhancing operational reliability in environments where regular re-lubrication is challenging.

Performance advantages are substantial and directly address the limitations of conventional linear guides. The ultra-high rigidity translates into minimal elastic deformation under load, which is critical for maintaining positional accuracy and repeatability. This results in dramatically improved machining quality, reduced vibration, and suppressed chatter in high-load operations. The full roller design provides a higher load rating—particularly for moment loads—compared to similarly sized ball-based guides. This allows for the design of more compact machinery without sacrificing performance. Furthermore, the optimized roller recirculation system ensures consistent, smooth motion at high speeds, contributing to higher throughput and productivity.

Typical applications for the SRG, SRG-G, and SRG-GV Series are found in heavy-duty industrial sectors where precision and reliability are non-negotiable. In industrial machinery, they are indispensable in high-precision machining centers, heavy-duty milling machines, and grinding equipment, where they provide the stable foundation required for fine surface finishes and tight tolerances. Within automotive manufacturing systems, these guides are deployed in high-load robotic welding arms, heavy-part transfer systems, and precision assembly lines. In the realm of precision equipment, they form the backbone of semiconductor manufacturing apparatus, inspection and measurement machines, and optical lens grinding equipment, where their rigidity ensures the sub-micron level accuracy essential for production. By offering a combination of unparalleled stiffness, high load capacity, and reduced maintenance needs, the THK SRG Series provides a robust and reliable linear motion solution for the most demanding industrial applications.