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Captive Screws maximize heat dissipation.

Press Release Summary:

Intended for electronic heat sink applications, Series 5T maximizes thermal conductivity regardless of chip thermal expansion, shock, and vibration. Design provides consistent set preload up to max of 5 ft-lb per screw, and includes positive stop to prevent board damage. Mounted at outer edges of heat sink, units cause minimal or no interference with heat sink fins. Hardened steel screws feature stainless steel springs and No. 2 Phillips/slot head style.

Original Press Release:

New Captive Screws Help Provide Maximum Heat Dissipation in Electronic Heat Sink Applications

Concordville, PA, July 22, 2005 -- A new line of Southco captive screws designed specifically for electronic heat sink applications provides a consistent, high-load mechanical fastening solution that maximizes thermal conductivity regardless of chip thermal expansion, shock, and vibration.

The physical design of the new Southco 5T Heat Sink Series Captive Screws provides thermal and mechanical engineers involved in printed circuit board applications with several distinct advantages beyond the capabilities of previous heat sink fastening methods. The design provides a consistent set preload up to a maximum of 5 pounds per foot (22 N) per screw to maximize surface contact and thermal conductivity throughout the range of chip expansion. This can actually allow for a smaller heat sink, conserving space and costs. Each screw features a positive stop to set the preload to help prevent the possibility of board damage.

Designed to mount at the outer edges of the heat sink, these captive screws cause minimal or no interference with heat sink fins and do not compromise their function. The hardened-steel captive screws with stainless steel springs deliver durable performance to withstand drop tests and vibration testing.

Because the screws are captivated into the heat sink panel itself and feature a self-contained spring, there is no loose hardware to short-circuit or damage the circuit board. The spring-loaded design also compensates for inconsistent chip and interface material thickness.

Southco Heat Sink Captive Screws come with a standard #2 Phillips/slot headstyle. A flare-in installation style makes it easy to captivate screws within the heat sink material. The heat sink screws are free of hexavalent chrome, and in salt spray corrosion testing have exceeded 144 hours of treatment. Multiple screw thread sizes and lengths are available.

For more information, visit Southco's website at; e-mail their 24/7 customer service department at; call 610-459-4000; or fax to 610-459-4012.

Southco is a leading global provider of engineered access solutions, including latches, locks, captive fasteners, hinges, handles, and other accessories for applications in the marine, networking, telecommunications, computer, automotive, aerospace, mass transit, off-highway/construction, RV/caravan, industrial machinery and HVAC industries.

Southco is strongly focused on customized engineering solutions and global support for its key customers. The company aspires to be a virtual engineering center for its customers' engineered-access solutions and is committed to providing outstanding quality and overall satisfaction. Southco's promise to its customers is to connect, create and innovate to provide the best solution for every access engineering problem.

Dale Clouser

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