The flat key is used to connect the shaft and the parts on the shaft, such as gears, pulleys, couplings, etc., to transmit torque and motion, and can also play a guiding role when axial movement is required between the mating parts
There are many types of keys. Commonly used key connections include flat key, semicircular key, tangential key and wedge key connection. Among them, ordinary flat key is the most widely used, and semicircular key (suitable for light-load connections that transmit small torques, often used in conical cooperation) followed by.

The basic composition of the flat key connection:
The flat key connection is composed of a key, a shaft keyway, and a hub keyway. During operation, the side of the key contacts with the sides of the shaft groove and the hub groove to transmit torque.

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