patented keys


Mul-T-Lock Mortise Cylinders can be used for both  residential and commercial door locksets. Available in a wide variety of sizes and designed for installation into virtually any existing mortise lockset, they allow you to change the cylinder of your Mortise lock without replacing all of the hardware.

Compatible with most major brands including Adams Rite, Yale, Corbin Russwin, Sargent and more.

Learn More and Buy

Mul-T-Lock’s Interactive+ key system addresses High Security concerns while responding to functional needs. Building on four decades of extensive experience and the Interactive® key system’s proven technology and global success, Interactive+ utilizes patented dual locking technology for enhanced High Security.

Learn More and Buy