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The Series 236 Card-Lok from Schroff incorporates a dual-thread design that allows the device to be compressed from both ends by turning a single screw.

This means that it can be tightened or released twice as quickly as conventional PCB retainers, thereby helping to reduce installation time.

The actuating screw head is recessed to save space and can be specified as slotted or with a choice of metric hex sockets (2 or 2.5mm).

Manufactured by Calmark, the Card-Lok features a lightweight five-segment aluminium construction using solid-frame extrusion for maximum rigidity and resistance to distortion under load.

Enclosed stainless-steel retaining springs are used to maintain alignment of the segments during insertion.

The PCB retainer is available with various finishes, including black anodised, electroless nickel and clear film.

Standard lengths range from 121.9 to 329.9mm and the device measures 5.84mm high, with a width expandable from 7.32 to 8.64mm.

Primarily designed for use in systems that are subjected to high levels of vibration, the Series 236 Card-Lok is suitable for securing PCBs in demanding environments such as avionics, defence, transportation, and the oil and gas industries.

For over four decades Schroff has been a world leader in the development and manufacture of electronics packaging components and systems.


The company offers a comprehensive range of enclosure solutions, including cabinets, subracks, cases, backplanes and power supplies, as well as complete systems for standard bus architectures such as VME, cPCI, AdvancedTCA and MicroTCA.


These products are based on the know-how of specialists in the integration of mechanical, electronic and thermal management systems, together with many years’ experience of the most diverse applications in all kinds of environments. Schroff technical personnel are also heavily involved in the development of international standards for electronics packaging systems, with representatives on numerous working groups of institutions such as the IEC, CENELEC, IEEE, BSI, VDE and DIN.


To complement its wide range of products, the company has established a co-ordinated service strategy designed to ensure that customers enjoy comprehensive support throughout the life of the product.Grouped together under the banner ‘ServicePLUS’, Schroff’s product support services are now arranged in eight modules comprising configuration, assembly, modification, solution, express, support, academy and lifecycle.


The Schroff website, provides full technical information on all of the company’s products, including detailed descriptions, technical data, user manuals, test reports and downloadable CAD drawings

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