Keyless element works based on wedge friction theory. By tightening clamping screw, clamp force generated. Due to taper geometry, clamp force is transmitted in radial direction to other member which induced contact pressure on hub and shaft. Due to interference between two bonded parts at shaft and hub, torque can be transmitted from shaft to hub through keyless elements. Keyless transmission elements which have varied and versatile applications on almost all engineering fields.The elements have great absorbing capacity of kinetic energy by elastic radial deformation of tapered rings. The method is also very simple. By expansion of the outer ring & shrinkage of inner rings, frictional shaft & hub connections are established, which transmits highest torques free from backlash. .