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Miniature Screw Thread

【英】困ったときの知恵袋詳細
Cutting TapsRoll (Forming) Taps Special Threads Standard (Screw Threads, Center Holes)
Can you tell me, what does the thread specification "S0.8X0.2" mean ?
It's a thread specification for Miniature Screw Threads used for wrist
watches, optical equipment's, electric instruments, etc. Miniature
Screw Threads use the thread symbol prefix "S" for identification
instead of using a "M" for metric threads.
(S0.8X0.2=0.8mm thread size with 0.2mm pitch)

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