Indication of the nominal size-2

【英】困ったときの知恵袋詳細

Cutting Taps Unified Threads Standard (Screw Threads, Center Holes)

I understand the nominal size of Metric threads but can you tell me the meaning of 1/4-20UNC for taps listed in your catalog? What is the meaning of "1/4" and "20"?

"UNC" is the abbreviation for "Unified Coarse Threads".
"1/4" indicates that the nominal diameter (major diameter) of a 1/4 inch tap (or 6.35 mm).
"20" indicates the number of threads per inch or pitch which converted is "1.27mm". Unlike Metric threads such as M8X1.25, you will need to calculate to convert to metric. For more information, Please refer to the explanation on the attached PDF file for details.

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