Pentair has developed new Card Lok PCB retainers to satisfy the increasing requirements of SWaP in military electronics. Card Loks offer a way to retain PCBs to cold walls with the power to handle rugged envirenments, while also coming in a small form factor. The three styles of Card Lok introduced in this paper are the High Clamp Force “HC”, High Thermal “HT”, and torque limiting “TLC”. These Card Loks provide the necessary protection in applications that need specific features to protect the PCB.