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Optimum Fastener Selection for Internal Pumping in Vacuum Systems

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The use of fasteners inside of vacuum chambers, while necessary for obvious reasons, can present a number of problems resulting from trapped volumes. Trapped volumes of gas, typically air trapped during assembly, within vacuum chambers are not easily found and can be difficult to pump out, often appearing later as “virtual leaks”. Fasteners also, due to their helix design, have a large surface area relative to their size, creating an un-exposed water-retaining surface. Fortunately there are optimal fastener configurations that address these issues.