The universal coupling is a kind of shaft coupling that permits large-angle displacement between the shafts, specially used for connecting shafts in that condition. The compact design of radial external dimension ensures convenient maintenance, large transmitting torque, high efficiency, long service life and low noise during working. Driving of intersecting shafts can be delivered. The large-designed shaft angle can be altered during its running and the maximum shaft angle can reach 35 - 45 degrees. When a single universal coupling is used, the speed of driven shaft will fluctuate periodically. And this is mainly used for the transmission connecting of the intersecting shafts. Due to such features as large deviation angle and transmitting torque, the universal couplings are widely applied in Metallurgical machinery, steel rolling machinery, mining machinery, textile machinery, paper machinery, cement machinery, hoisting and conveying machinery, petroleum machinery, electrical machinery, chemical machinery, shipbuilding, etc. various conditions of universal machinery and heavy machinery.