Blackened Double Headed Bolt M8*M8*40mm

Double headed bolt: a "two end bearing" specially designed for connection
Double headed bolt, commonly known as "double headed bolt" or "column bolt", is a special fastener with threads on both ends and a smooth rod in the middle. The most significant difference between it and ordinary bolts is that it does not have a fixed head, and this unique design makes it play an irreplaceable role in specific applications.
Its main function is to serve as a permanent or semi permanent installation base. A typical application scenario is the shell connection of large equipment, such as engine cylinder heads, valve flanges, or heavy machinery shells. During installation, one end (bottom end) is firmly screwed into and fixed in a threaded hole of a substrate (such as a machine body), as if "rooted" in it. Afterwards, place another component that needs to be connected (such as the cylinder head) onto the light rod and tighten it with a nut on the other end (top) of the bolt.

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