I have a question on two terms used in defining a new thread.
"Thread Minor Diameter" and "Thread Minor Diameter Inside"
The data for a 1/4-20 from the hole wizard data:
"Thread Minor Diameter" = 0.1905
"Thread Minor Diameter Inside" = 0.1959
I can not find any thread data close to the numbers given above for a internal thread in any of our thread data books.
Is the "Thread Minor Diameter" the theoretical diameter for 100% full thread?
I just need to know exactly how the terms above relate to physical thread geometry.
And where I can find the data or what formulas are used to derive them.
The answer in S-04970: Thread Minor Diameter = the diameter of a cylinder formed by the roots of the threads
Thread Minor Diameter Inside = the diameter of a cylinder formed by the crests of an internal thread
Is unclear at best as to how the number relate to the actual thread geometry.
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