Pentair's Series 223 and 224 Card-Lok Retainers

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Pentair Technical Products announces Calmark® brand Series 223 and 224 Card-Lok Retainers, designed to secure board module assemblies to the cold wall in cold plate - heat exchanger applications—with no torque wrench required. Card-Lok Retainers employ a screw-actuated wedge action that locks the board module assembly in place with the use of a standard hex wrench, establishing the secure hold required for military two-level maintenance systems. Five audible clicks during tightening indicate that a safe, yet firm clamping force has been reached. This torque-limiting design applies no insertion and extraction force on board module assemblies, eliminating the risk of overtightening to prevent damage to the board and Card-Lok during installation.


Available in 5.72 mm x 6.60 mm (.225 in. x .260 in., Series 223) and 5.33 mm x 6.99 mm (.210 in. x .275 in., Series 224) profiles, Card-Lok Retainers feature a five-piece design that provides a clamping force of up to 350 lbs. This arrangement optimizes contact between thermal paths on the board module assembly and heat-sinking surface, establishing maximum thermal transfer for reliable electronics cooling. An alignment spring returns wedge bodies to the related position upon unclamping, keeping wedges in line for tight tolerance situations.

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