Restricted Locks

Restricted locks are named like that because of the key restriction (as above with High Security locks) and patented keyways. They do not undergo the same testing and do not have the same physical security as full High Security, but are still much safer than your typical box-store-lock.

While some locksmiths infer that restricted locks are “basically the same” as high security, they are not! There is a significant difference.


Peaks® Preferred key control system by Ilco is the foundation for any secure access control system. Strong utility patents,contractual agreements, unauthorized manufacturing and duplication of keys is prohibited.

Medeco X4 is the most economic and efficient solution.  Medeco X4 has one of the largest master key capabilities on the market.  This allows facility managers to tie everything together under one key for ease, convenience and efficiency.


Offers the highest level of restricted key system security by Schlage through patent protection of the keyway design. Patent protected key systems prohibit key duplication and assist a facility owner in maintaining key control.