Rigid shaft coupling with a simple, robust design that delivers high torsional stiffness and no backlash for reliable high-speed rotation. Key specs - Length: 40 mm - Outer diameter: 25 mm - Bore diameters (d1 and d2): 6.35 mm, 8 mm, 10 mm - Construction: rigid, minimizing compliance to maintain precise torque transmission Why you need it - No backlash and high torsional rigidity ensure accurate torque transfer at high speeds - Simple structure for straightforward installation and long service life - Compact 40 x 25 mm footprint fits tight machine layouts Compatibility and fit - Suitable for motors and gearboxes with bore sizes of 6.35 mm, 8 mm, or 10 mm on each side - The standard outer envelope of 25 mm and length of 40 mm supports compact integration use scenarios - CNC machines: connect a servo motor to a spindle drive for precise, high-speed operation - Robotics and automation: couple high-speed actuators or joints with reliable torque transmission - Conveyors and packaging lines: transfer motion between motor and drive components with minimal play This description preserves the original specifications and function while presenting clear, customer-friendly benefits and practical applications.