HES MCK-4-2 Mortise Cylinder Kit

Provide cylinder-related hardware for a mortise-cylinder door-lock application without selecting a complete lockset or access-control assembly. The HES MCK-4-2 mortise cylinder kit is classified for physical-security use and addresses the mechanical cylinder portion of a door-hardware installation or service task. Mortise cylinders are threaded lock cylinders used with compatible mortise lock hardware. Their selection depends on the lock preparation, door thickness, cylinder length, cam or tailpiece arrangement, and the keying system used at the opening. A cylinder kit belongs in work involving those mechanical interfaces, rather than in applications that only require an electronic reader, credential, or wiring component. Use this kit where the door hardware calls for a mortise-cylinder configuration and the existing opening must retain compatible mechanical locking operation. Its kit format distinguishes it from a complete locking device: it addresses the cylinder-related portion of the installation. Match the kit to the installed lock hardware, door preparation, and required keying arrangement before installation. This approach helps ensure that cylinder engagement, lock operation, and door security are maintained at the opening.