How master keying works
Inside a master-keyed cylinder, extra pin stacks create two (or more) valid key combinations: the individual change key for that door, and the master key shared across the system. One physical lock, two levels of permission — no electronics, no batteries, just careful pinning and a documented key plan.
Systems scale in tiers: a master for the building, sub-masters for departments or suites, and change keys for single doors. The design step — deciding who opens what — is the real work, and we do it with you door by door.
Where it pays off
Offices, retail with back rooms, medical suites, churches, and managed properties: anywhere one person (owner, manager, cleaner, landlord) needs whole-building access while everyone else needs a slice. It also makes turnover cheap — rekeying one suite’s cylinders doesn’t disturb the master.
The companion discipline is key control: a master system without a key list quietly degrades back into guesswork.
Honest limits
Master keying trades a little theoretical security for a lot of practical control: a master key is a high-value object and must be guarded like one. For the highest-security doors, we’ll recommend restricted keyways or standalone high-security cylinders instead — see high-security locks.
How this article connects
- ✓Commercial Locksmith — the full service page
- ✓Business Rekeying & Key Control
- ✓Commercial Lock Service
- ✓High-Security Locks
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