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Schroff has brought out a series of PCB retainers that provide a clamping force of more than 4000N, making them ideal for challenging environments, such as those in defence and aerospace systems.

Manufactured by Calmark, the Card-Lok Series 280 retainers use a five-wedge design to achieve both the high clamping force and the excellent thermal performance required for cold-plate heat-transfer applications.

The PCB retainers are made from aluminium alloy to minimise weight and can be specified with a choice of finishes, including black anodised, black hard anodised and electroless nickel.

Offered in three standard lengths of 71.1, 96.5 and 121.9mm, the Series 280 retainers have a height of 9.3mm and a width that is expandable from 9.7 to 11.7mm.

Available options include captive screws, locking screws and visual lock indicators, and the retainers can be supplied in special lengths or finishes on request.

Schroff, one of Calmark’s sister companies within the Pentair Electronic Packaging Group, is now the exclusive UK supplier of the Calmark range of rugged PCB retainers.

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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