A Break Nut is a nut that is breaks lengthwise into two pieces (opposed halves) so that its female thread may be opened and closed over the male thread of a bolt or lead screw. This allows the nut, when open, to move along the screw without the screw turning (or, vice versa, to allow the screw to pass through the nut without turning). Then, when the nut is closed, it resumes the normal movement of a nut on a screw.
A Break Nut assembly is often used in positioning systems, for example in the lead screw of a lathe. It is one of the machine elements that make single-point threading practical on manual (non-CNC) lathes. The very earliest screw-cutting lathes (in the late 18th and early 19th centuries) did not have them, but within a few decades, break nuts were common on lathes.
The two halves of the nut have chamfered ends (60° to axis), which helps the threads to find engagement during the closing action. Usually the screw and nut are also oiled for lubrication. Such provisions prolong the service life of the threads by minimizing wear.
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