A keyway is a slot or groove machined into a shaft or component to hold a key and prevent rotational movement.

A keyway is a precisely machined slot or groove cut into a shaft, hub, or mechanical component to receive a key. The key fits into the keyway and locks two components together, allowing torque to be transmitted while preventing relative rotation.

In construction and mechanical systems, keyways are commonly found in equipment such as motors, pumps, conveyors, fans, and elevators. They are used where rotating power must be transferred reliably from a shaft to another component like a pulley, gear, or coupling. Keyways are engineered to specific dimensions to ensure proper fit and load capacity.

Proper design and installation of keyways are critical for equipment performance and longevity. Incorrect sizing, poor alignment, or worn keyways can lead to vibration, slippage, or mechanical failure. Adhering to manufacturer specifications and industry standards ensures safe and efficient power transmission.

A small key seated in a keyway can transfer thousands of pounds of rotational force—proof that tiny components can play huge roles in mechanical systems.