[ENG sub] Inch (UN) thread calculation and metric inch system conversion method

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Unified (UN) screws are screws in inch units.(Subtitles included)
This video shows the calculation method for converting the inch system to the metric system.
Unified UN threads are generally classified into inch regular thread UNC and inch fine thread UNF.
UNC = Unified National Coarse
UNF = Unified National Fine
The screw angle is a 60 degree triangular screw and is different from PF and PT screws.
I will post separately about PF and PT screws.
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