THK SR20-280L LM Guide Linear Bearing Assembly

The THK SR20-280L LM Guide Linear Bearing Assembly is a precision linear motion system consisting of an SR20 radial-type guide rail paired with a compatible SR20 bearing block, engineered for smooth, low-friction, high-rigidity movement in precision automation. It is designed for medium-duty precision motion and is commonly used in CNC machine tools, semiconductor equipment, packaging machinery, robotics, inspection systems, and automated production lines. Key specifications include a 20 mm rail width, 280 mm rail length, hardened alloy steel rail, full-ball bearing design, and compatibility with THK SR20 Series blocks (SR20V, SR20W, SR20SB, SR20TB); rail mounting hole pitch follows the standard SR20 configuration and rail mounting accuracy is precision-ground. Lubrication options are grease or oil, and accuracy grades range Normal, H, P, SP, UP; operating temperature is -15°C to 80°C. The four-row ball raceway design provides high rigidity, low noise, self-adjusting capability, and long service life. Maintenance teams and system integrators rely on this assembly for OEM replacement, machine repair, retrofit projects, and new linear motion installations. Common replacements include THK SR20-360L LM Guide Assembly, THK SR20-440L LM Guide Assembly, and THK HSR20-280L LM Guide Assembly. The compact radial guide design suits factory automation, electronic assembly systems, laboratory instruments, vision inspection machines, medical equipment, and material handling systems.