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H1

Two start thread (Double thread)

【英】困ったときの知恵袋詳細
Cutting Taps Metric Threads Standard (Screw Threads, Center Holes)
I have a process drawing with the designation M10X1.5 2N. How is it different from a M10X1.5 screw thread?
The 2N of a M10X1.5 2N designates the thread as a two start or is a double thread. Although it will be a bit more difficult to produce, a screw with two starting points is called a two start or double thread. A typical M10X 1.5 screw thread advances 1.5 mm in one revolution, but the two start or double thread advances twice the 3 mm of a normal screw thread. For details, please see the explanation below.

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