The screws are particularly needed to fasten a device or to support a gasket. Among the advantages of the metal screws we find the robustness, conductivity, as well as heat and cold resistance guaranteed by this material. Because the head of the block is subject to particularly extreme conditions, the respective screws must be expansion screws. The material must be able to expand without breaking or having the consequences of wear before it is due. Therefore, steel or various alloys are used most often. What makes the head screw different from many others is its shape.
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