Combine with a machine key to transmit torque to gears, sprockets, and other power transmission components.

Attach threaded accessories, such as mixer propellers and fan blades, to the end of these shafts.

A shoulder near the end of the shaft provides a stop for gears, sprockets, and bearings.

Mount these externally threaded shafts into tapped holes rather than using a shaft support, or attach a hex nut, shaft collar, or other threaded accessory.

A shoulder near the end of the shaft allows for easy positioning of housings, shaft supports, and collars.