The primary function of a coupling is to connect two shafts that turn in the same direction and on the same centreline.

Selecting a coupling will depend on a number of important factors depending on operating conditions. Factors which should be considered include:

• Horsepower
• Torque
• Angular misalignment
• Offset misalignment
• Type of driven equipment
• Rotational speed
• Shaft size
• Space
• Environment