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The Mosin-Nagant design has a separate bolthead which rotates with the bolt and the bearing lugs, in contrast to the Mauser system where the bolthead is a non-removable part of the bolt. the Lee-Enfield system where the bolthead remains stationary and the bolt body itself. — “Bolt action - Wikipedia, the free encyclopedia”, en.wikipedia.org
The Florence flask of commerce is frequently used for this purpose. If so, some identity of shape is the reason for the application of the word; bolthead is also used as a name for the vessel. — “Matrass - Wikipedia, the free encyclopedia”, en.wikipedia.org
This article is within the scope of WikiProject Metalworking, a collaborative effort to improve the coverage of Metalworking on Wikipedia. Bolt is labeled in error; the square shank is directly below the bolthead, then there is a round, unthreaded shank, followed by the threaded section. — “Talk:Bolt manufacturing process - Wikipedia, the free”, en.wikipedia.org
If I'd a called it a bolthead it would a done just as well. — “Huckleberry Finn” by Mark Twain