What is the function of keys and keyways in couplings?

The function of keys and keyways in couplings is to create a secure hold between shafts. Keys are small components that fit into a slot (the keyway) machined into the shaft. This connection ensures that the rotating motion of one shaft is efficiently transmitted to another shaft, preventing slippage during operation. The tight fit provided by the key and keyway design allows for a reliable transfer of torque, which is essential in mechanical systems where smooth operation and coordination between rotating parts are crucial.

Keys and keyways are fundamental in ensuring that assembled components maintain their alignment and performance, which is important for efficiency and safety in various mechanical applications. This secure connection is critical in preventing unintended disconnections under load, which could lead to machinery failure or damage.