Threaded shaft collars are mechanical components used to secure and position components on a shaft. They are typically made of metal or plastic and consist of a cylindrical body with a threaded bore that allows them to be tightened down onto a shaft. They may also have set screws or clamping mechanisms to provide additional holding force.

Threaded shaft collars are commonly used in machinery and equipment to hold bearings, pulleys, gears, and other components in place. They can also be used to create stops or limit switches on a shaft or to provide a mounting point for sensors or other devices.