The difference between Rc and PT

【英】困ったときの知恵袋詳細

Cutting TapsRound Dies Pipe Threads Standard (Screw Threads, Center Holes)

I do not understand all of Taper Pipe Threads that can be produced. Please explain as easily as possible the difference in these Pipe Taps. It seems there are three types of Taper Pipe Threads: "PT", "R" and "Rc" . Also, it seems that there are "PT", "S-PT" and "Rc" in tap offerings. Are dies offered in the same specifications as the mating taps?

The relationship between taper pipe threads, taps and dies was changed about 20 years ago after the JIS standard changed. However, the market is still in the process of switching. It is in a transitional period, and it's very difficult to understand because old and new standards are mixed. First of all, let me explain about Internal Pipe Threads and taps as easy as possible. Let's start.

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