A coupling is a component used to connect the driving shaft and the driven component. The main functions are below:

• Connect the drive shaft and the driven parts to transmit power.
• Compensating the misalignment between the drive shaft and the driven shaft
• Absorb shock and vibration
• Improve the performance of the equipment

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With rigid couplings, the two shafts should be accurately alignment during installation. The rigid couplings are not able to compensate for shaft misalignment. However, rigid couplings have many advantages, including simple structure, easy assembly, convenient maintenance, and low cost.
The flexible shaft coupling can be classified into elastic couplings and universal joints. The universal joints can only compensate for shaft misalignment. But the elastic coupling can not only achieve the function above but also absorbs shock and vibration.

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Different types of shaft attachment methods are available. We will introduce the common attachment methods below:

• Set screw type
  The two set screws feature a 90 degree angle. They are tightened for fastening the coupling to the shaft. The method is a traditional attachment type. Because the screw points directly contact the shaft, it may damage the shaft or make it difficult to remove the shaft from the coupling.
• Clamping type
  Tighten the socket head cap screws to contract the bore for clamping the shaft to the coupling. This method allows for easy attachment and removal, and it will not damage the shaft. It is a common way to fasten the coupling to the shaft.
• Keyway type
  The keyway type is suitable for high torque transmission. In order to avoid the slip of the shaft, it is used combined with the set screw type and clamp type.
• Clamping ring type
  This attachment method features taper wedge effect to allow for stable and fast fastening the coupling to the shaft. It is suitable for high torque stepping motor and servo motor.

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