Master Keying David M Koenig CPP Master Keying

Master Keying David M. Koenig, CPP

Master Keying Is. . . n System Of Organizing Numbers – For Cutting Keys – For Pinning Locks Grouping Of Locks And Keys n Set Of Locks That Are Operated By More Than One Key n

Master Keying Provides Convenience Over Security n Separate Keys For Individual Locks n Keys To Operate Groups Of Locks n Single Key For All Locks In System n Ability To Carry Fewer Keys n Organization Of And Management OF Lock & Key System n

Master Keying Disadvantages Makes Locks Easier To Pick n Small Master Pins Increase Service Issues n Higher Re-keying Cost If GMK Or GGMK Keys Are Lost n More Thought Involved In Administration n Controlled Destruction of Lock Security n

Master Keying Terms KA - Keyed Alike - Several Locks Operated By The Same Key n KD - Keyed Different - Each Lock Operated By It’s Own Key n

Master Keying Terms n CK - Change Key – Work Individual Lock MK - Master Key n GMK - Grand Master Key n – Works Large Group Of Locks n GGMK - Great Grand Master Key – Fits All Locks In System

Master Keying Terms n SKD - Single Keyed Different – Lock Set To Change Key Only n NMK - Not Master Keyed – Similar To SKD n Levels - Number Of Different Types Of Keys In System – Example CK-MK-GMK = 3 Level System

Master Keying Terms n 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

System Size and Security 5 Or 6 Pin Chambers (more is better) n Chamber Depths n Pinning Increment (Key / Pin Wear) n How Many Chambers Are Progressed n Angles (Or Other Factor) Employed n

System Size and Security MACS (Maximum Adjacent Cuts) Loss n How Many Masters Employed n Sectional Keyways n

Typical System Example 8 Depths (1 -10 Less Two for MK) n Less Increments of Two n Used In 6 Chambers Equals… n 4 To 6 th Power Equals… n 4, 096 Theoretical Combinations n Less MACS Of 20% n Equals 3, 276 Maximum Combinations n

Medeco Biaxial System Size 4 Depths (1 -5 Less One Number For GMK) n Used In 6 Chambers Equals… n 4 To 6 th Power Equals… n 4, 096 Theoretical n Times 9 Sections (Angles) Equals. . . n

Medeco Biaxial System Size Equals 36, 864 Changes Under Single MK n With MACS Loss Of 20% Combinations (Maximum Adjacent Cuts) n Over 29, 400 Maximum Combinations n Number Of Chambers Used For Master Keys Reduces Maximum And Determines Availability Within A MK n