What is the difference between a mortise cylinder and a rim cylinder?
A.A mortise cylinder is installed by screw in threads and is used on locking units that that are “mortised” into a door. Typical mortise cylinder applications are motel doors and aluminum framed doors on commercial buildings Rim cylinders are installed with long screws that hold the cylinder in the door from the inside. Rim cylinders operate locks that attach to the surface of the door.