How Do Espagnolette Locks Work?

An espagnolette locking system (shortened to espag) is the flat metal strip which runs up the locking side of a window and moves when the handle is turned. Often they have round studs on them called mushrooms which move up and down (or side to side depending on how your window sits) when the handle is moved.

How do Espag window locks work?

The espag handle is designed to incorporate a square spindle that projects from the back of the handle and enters the gearbox of the lock mechanism, which is usually hidden inside the window. By turning the handle you can then turn the mechanism inside the window which then turns the locking points around the window.

What is an espagnolette bolt?

An espagnolette is a locking device, normally mounted on the frame of a French door or casement window, with a handle or knob at about three of four feet above the floor which rotates a round bar with hooks at the ends into sockets at the head and sill of the opening.