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Board Retainers and Extractors

Proven Solutions for PCB Board Retention and Extraction

nVent SCHROFF’s Calmark and Birtcher product lines are the industry leader and have been used in the Military and Aerospace markets for over 40 years.  Quality is paramount with all products manufactured in an AS9100D compliant facility.

A range of products for a variety of applications

Card-Loks and Wedge-Loks

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  • Innovative high thermal and clamp force designs for best in class performance
  • Standard COTS or modified products to meet application requirements
  • Designs for second level maintenance including torque limiting and toolless Card-Loks

Inserters, Extractors, Levers, and Ejectors


  • Designs to ensure safe card extraction for rugged applications
  • Aluminum and nylon offering to meet all extraction force needs
  • Tolerance compensating offering to mitigate board tolerance concerns


PCB Tainers, Retainers, and Card Guides


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  • Economical offering to retain PCB's in sheet metal applications
  • For low shock and vibration applications in sheet metal enclosures
  • Metal Tainers provide positive spring pressure to retain and/or ground the PCB
  • Nylon card guide products available for applications where resistance to akalines, weak acids or solvents is required

Digital Design Tools

Card-Loks and Wedge-Loks

  • Selector type tool that guides you through key decisions in the design process

  • Includes options for series, length, surface finish, mounting option, and many other features 

  • Generates a standard part number

  • Quickly provides relevant information to our design team and includes the request for quote

  • Takes less than 5 minutes to complete

Helpful Resources


Defense and Aerospace


Calmark and Birtcher Card-Lok Performance


Advancements in Card-Lok Technology to Satisfy SWaP and 2nd Level Maintenance Requirements


The Benefits of Torque Limiting Card-Lok Retainers for Field Level Repairs


AS9100 Quality System