This is a metal disk type coupling which uses steel as the material of the main body. It has high rigidity and realizes accurate shaft rotation and ultra-precision control, making it optimum for general feed shaft applications. Available types are a high rigidity single element type and a flexible double element consisting of two elements joined together via a spacer. The basic type of flange used to install the shaft employs friction fixing. It can be used in a wide range of applications from small to large diameters.