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www.reference.com/article/measure-diameter-bac362bc65599f5d

If the radius of the circle is known, the diameter formula is diameter=2R, where R equals the circle's radius. If the circumference of the circle is known, the diameter is found using diameter=C/Pi, where C is the circumference and pi is approximately 3.142.

The major thread diameter is the distance from crest to crest through the central axis of a screw. The minor thread diameter is the distance from trough to trough through the central axis of a screw.

A thread pitch diameter calculator calculates the diameter of a screw, at which the width of the thread running in a helix along the screw and the width of the spaces between threads are equal. This diameter is one of the properties that determines the optimal use of a ...

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Headings on a thread pitch chart include thread class, the fit when a screw is being placed in an also-threaded part; major and minor diameter; and pitch diameter, the point where the width of thread and space between threads is equal. Screw dimensions vary based on the...