This refers to the channels or grooves that distinguish one type of key blank from another. Your Chrysler key won’t go into your Toyota locks because it has a different keyway. Your Kwikset deadbolt can’t be keyed to match your Schlage doorknob because they have different keyways. Locksmiths must maintain huge inventories of key blanks because of the huge variety in keyways.Master key (for a building)
This refers to a system in which a set of locks are keyed different, and yet can all be operated using a single key as well. An example would be a set of apartments. Each tenant has a key to his/her own unit which does not work the others. The landlord, however, carries a single master key that operates all units. Office buildings, retail stores, schools, hospitals and churches all utilize master keys systems. Only a professional locksmith can design, implement and maintain a masterkey system properly! See also change key and submaster key.Master key (for a vehicle)
This refers to the key that operates all locks on the vehicle, including the ignition, doors, trunk and glove box and/or consoles. See also valet key.Mortise Lock
This refers to a lock that is installed by carving a rectangular cut-out from the edge of the door. Mortise locks are still made today, but were far more common before the 1950's when cylindrical locks became common. Old “skeleton key” door locks are usually mortise locks, as are residential and commercial locks in which the latch and deadbolt are operated by a single keyhole. (If the keyhole is above or below the knob or lever handle--not built into the handle--you probably have a mortise lock). See also cylindrical lock and rim lock.Original key
This refers to any key that is not made by tracing another key. It can refer to the keys that came from the factory with the lock or to a key made by a locksmith by any means other than duplicating. See also fit a key. If you have lost your last key to something, you don’t need a copy (though you probably wish you had one!). You need to have an original key made!