If you manage an apartment building, office complex, or commercial property, a master key system is one of the most useful tools in your security toolkit. Here's how it works in plain English.
The Basic Concept
In a master key system, each lock is pinned in a way that allows two different keys to operate it: 1. A change key — a unique key that only opens one specific lock 2. A master key — a key that opens all locks in the system
How It's Done
Inside each pin tumbler lock are two sets of pins: the standard pins (for the change key) and additional master wafers. The master wafers create a second shear line that the master key engages, allowing it to operate the lock even though it has a different profile than the change key.
Hierarchy of Keys
Master key systems can have multiple levels: - Change Key: Opens one lock only (e.g., a tenant's apartment key) - Sub-Master Key: Opens a group of locks (e.g., all units on one floor) - Master Key: Opens all locks in the system - Grand Master Key: Opens all locks across multiple properties
Who Uses Them?
Apartment buildings, office complexes, schools, hotels, hospitals, and commercial retail centers all rely on master key systems. LockAngeles LA designs and installs complete master key systems for Los Angeles properties of all sizes.