Dog (engineering)

Or it may couple various parts together so that they move in unison – the primary example of this being a flexible drive to mate two shafts in order to transmit torque.

Chainsaw dogs provide stability and serve as a sort of fulcrum for swinging the bar through the item being cut.

Functional exterior window shutters (which can be swung shut whenever storms approach in order to protect the window glass from impact by wind-blown debris) are held open during pleasant weather by wrought-iron or cast-iron dogs, which are called shutter dogs.

A bench dog is an accessory used on a woodworking workbench to allow clamping of wooden items whilst being worked.

The dog clutch contrasts with the friction clutch, the most basic form of which comprises a smooth disc and pressure plate: when pressed together they lock up simply through friction, which permits some degree of slip as the mating pressure is modulated and thus permits some difference in the rotational speeds of the discs.