Various thread diameters and pitch combinations are called a. thread series
What are the basic science terms?
- A parallel thread's pitch diameter (also known as its effective diameter) is the diameter of the imaginary co-axial cylinder that intersects the surface of the thread in such a way that the intercept on a generator of the cylinder between the points where it meets the opposite flanks of a thread groove is equal to half the nominal pitch of the thread.
- A thread's major diameter is the diameter of an imaginary co-axial cylinder that hits the crest of an exterior thread or the root of an interior thread.
- The minor diameter is the diameter of an imagined cylinder that only brushes up against the roots of an external thread and/or the crests of an interior thread.
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