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Master KeyingMaster Keying
David M. Koenig, CPP
Master Keying Is...Master Keying Is...
System Of Organizing Numbers– For Cutting Keys– For Pinning Locks
Grouping Of Locks And Keys Set Of Locks That Are Operated By More
Than One Key
Master Keying ProvidesMaster Keying Provides
Convenience Over Security Separate Keys For Individual Locks Keys To Operate Groups Of Locks Single Key For All Locks In System Ability To Carry Fewer Keys Organization Of And Management OF
Lock & Key System
Master Keying DisadvantagesMaster Keying Disadvantages
Makes Locks Easier To Pick Small Master Pins Increase Service Issues Higher Re-keying Cost If GMK Or GGMK
Keys Are Lost More Thought Involved In Administration Controlled Destruction of Lock Security
Master Keying TermsMaster Keying Terms
KA - Keyed Alike - Several Locks Operated By The Same Key
KD - Keyed Different - Each Lock Operated By It’s Own Key
Master Keying Terms Master Keying Terms
CK - Change Key– Work Individual Lock
MK - Master Key GMK - Grand Master Key
– Works Large Group Of Locks GGMK - Great Grand Master Key
– Fits All Locks In System
Master Keying TermsMaster Keying Terms
SKD - Single Keyed Different– Lock Set To Change Key Only
NMK - Not Master Keyed– Similar To SKD
Levels - Number Of Different Types Of Keys In System – Example CK-MK-GMK = 3 Level System
Master Keying TermsMaster Keying Terms
Sectional Keyways - Variety Of Key Blank Grove Sizes And Shapes– Divided Into Groups– Some Patterns Are Wider Than Others– Higher Level Patterns Fit Into Multiple
Keyways– Allows Cut Numbers To Be Repeated
1
System Size and SecuritySystem Size and Security
5 Or 6 Pin Chambers (more is better) Chamber Depths Pinning Increment (Key / Pin Wear) How Many Chambers Are Progressed Angles (Or Other Factor) Employed
System Size and SecuritySystem Size and Security
MACS (Maximum Adjacent Cuts) Loss How Many Masters Employed Sectional Keyways
Typical System ExampleTypical System Example
8 Depths (1-10 Less Two for MK) Less Increments of Two Used In 6 Chambers Equals… 4 To 6th Power Equals… 4,096 Theoretical Combinations Less MACS Of 20% Equals 3,276 Maximum Combinations
Medeco Biaxial System SizeMedeco Biaxial System Size
4 Depths (1-5 Less One Number For GMK) Used In 6 Chambers Equals… 4 To 6th Power Equals… 4,096 Theoretical Times 9 Sections (Angles) Equals...
Medeco Biaxial System SizeMedeco Biaxial System Size
Equals 36,864 Changes Under Single MK With MACS Loss Of 20% Combinations
(Maximum Adjacent Cuts) Over 29,400 Maximum Combinations Number Of Chambers Used For
Master Keys Reduces Maximum And Determines Availability Within A MK