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Rugged Conduction Cooled Assemblies and Modules

Your Trusted Partner for Rugged, High Performance Solutions

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.  

Watch our Conduction Cooled Assembly (CCA) design process - we'll walk through the process from start to finish including:


  • Comprehensive consultation from the very beginning.
  • Ability to work with existing board, frame, or chassis designs
  • CAD templates and 3D printed prototypes available
  • Thermal design, simulation and analysis services
  • Over 60 years of experience as an industry leader in board retention and cooling

A range of products for a variety of applications

Card-Loks and Wedge-Loks

card lok, wedge lok, clamp force

  • 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

PCB extractor, PCB inserters, circuit board extractor

  • Designs to ensure safe card extraction for rugged applications
  • Aluminum and nylon offering to meet all extraction force needs
  • Tolerance compensating designed offering to mitigate board tolerance concerns and satisfy 2nd Level Maintenance requirements
  • Compliant to MIL standards, such as VITA 48.4 and 48.2

Conduction Cooled Assemblies and Modules

conduction cooled assembly, conductor block, CCA

  • VITA Compliant Conduction Cooled Assemblies with high performance cooling for severe environments
  • Manage all components under a single sku
  • Downloadable VITA compliant CAD templates available
  • Pre-assembly and kitting available

Conduction Cooled Assembly Keying

Conduction Cooled Assembly Keying

  • For conduction cooled modules used in military and ruggedized systems that do not use front panel systems
  • ANSI VITA 1.6 Standard compliant
  • Secure to Conduction Cooled Assemblies, and prevent backplane damage due to insertion into wrong slot

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

card lok, wedge lok, clamp force

Helpful Resources


Calmark, Conduction Cooled Assembly (CCA)


Aerospace and Defense


Military and Avionics System and Thermal Solutions Provider


AS9100 Quality System