Locking assemblies are linkers used between shafts and pulleys, which can replace the single keys and splines. They can transmit torque through a set of tightening screws with high strength, which can make the required clamping force between the inner rings and shafts, also between the outer rings and hubs. It's wasy assmebling and diassembling. They have a good interchangeablity. The screws are with high strength. Their main material is superior steel. After machining, they will have smooth and beautiful surface, a long lifetime and high strength.