Features & Benefits

  • Patented product* - can not be copied or supplied by others
  • Retrofitted to the original version Keso master key systems
  • Two lines of dimples (Line 1 and Line 2) can be added to the key blade - offers over 100 thousand usable combinations
  • Operates in existing old style Keso cylinders
  • Unique combination of pin lengths and positions
  • No chance for duplication
  • 6-sided F1 key is stronger than a conventional
  • Ideal choice for highly abusive applications
  • UL 437 provides a maximum level of pick and drill resistance
  • Available in removable core
  • F1 keys will operate existing Keso cylinders, but existing Keso keys will not operate Keso F1 cylinders
  • Keso F1 key is symmetrical and reversible

Strength & Durability

  • Cylinder has 12 pins unlike most cylinders with only 6 pins
  • Unique 6-sided dimpled key is much stronger than warded keys
  • Precise manufacturing and the absence of splits makes the cylinder highly pick-resistant


  • Compatible with existing non-patented Keso key systems
  • Key is symmetrical and reversible
  • Removable core versions available
  • UL 437 Version available for mortise and rim cylinders
  • Temporary Construction core available


  • Up to 7 levels of master keying available
  • 100,000 different key pin patterns available within any one installation
  • Keso F1 cylinders can be retrofitted to original Keso cylinders
  • Keso F1 key will operate existing old style Keso cylinders


  • Patented protection for both key and cylinder
  • F1 keys can not be legally duplicated
  • Owner's authorization required for any F1 keys/locks
  • Pick resistance
  • Impossible to determine configuration key system by examining pinning configuration
  • Every key stamped with the key system registration # and with key #. Key sets also optionally available to be stamped on keys and/or cylinders plug faces

Ideally suited for

  • Government Buildings
  • Police Stations
  • Hospitals
  • Schools
  • Warehouses
  • Colleges
  • Detention Centers
  • Psychiatric wards
  • Any high abuse application

 Schools  Healthcare  Commercial 

*Patent pending

ASSA ABLOY, the global leader in door opening solutions

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