Keyed to Differ (KD)
All keys are individual and stand alone. Each lock can only be opened by its own individual key. Keyed Alike (KA) The system allows a number of locks to be operated by the same key as they are keyed to a specific code. This system is particularly suitable for residential applications with front and back doors.


Master Keying
Master keying is a method of controlling access through a building. A key schedule is prepared from provided floor plans. It includes a key matrix, which locates keys and locks and their distribution and usability. Security is based on a system where one lock has its own key. This key will not operate any other locks in the property/building, however where all locks are in the same property/building the locks can be operated by the one master key.


Grand Master Key
With this system, locks in several groups are independently keyed with a master key for each group. Each group is independent of each other, and the grand master key will work with all locks in all groups.


Maison Keying
A maison key system is a keying system that allows a lock to be opened with a number of unique individual keys. Typically found in applications like apartment buildings, it provides unrestricted access to common doors. Unlike master keyed systems, the lack of security makes this a less attractive option.


Residential Construction Keying (RCK)
RCK system involves a single key, replicated to be used by tradesmen for all homes during the construction phase. Building companies will be supplied 25 keys free (additional keys by negotiation), which can be reused on future houses/apartments. Each building company receives a personalised RCK system, so no two building companies have the same keys. When the new homeowner takes over the house, they are presented with their own keys, which, when used, automatically resets the lock cylinder, making the RCK inoperable and providing the homeowner final ownership and security.


Standard Master Keying vs Restricted
With a non-restricted key (standard / open key), keys can be duplicated by any standard key cutting personnel. However, the ability for someone to cut a master key without knowledge of the origin or ownership of the key, is a risk that should be considered. With the restricted key, the key blanks are restricted to approved locksmiths only. Keys cannot be cut without authorisation, which allows enhanced security, total key control and accurate record keeping of keys cut to date. Record keeping is maintained on a database which is held by the locksmith.


C4 and C5 Keyways
The Schlage “C” keyway key blank C5 (5 pin) is part of the Schlage keyway family and is the default keyway used in Schlage Residential locks. The classic “C” keyway provides security with no restrictions on key duplications. The C4 (5-pin) keyway is useful when keying alike to existing locks that are not from Schlage, as it is a keywa used by other hardware brands.