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Originally Posted by Serum
It's M3x.5 mm.
What other numbers did you see? there are all sorts of taps; blind holes, thru holes, machine taps.. etc.. Some taps take 3 taps to make 1 good thread, while others make the thread in one single pass.
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When I was at the LHS a few weeks ago, I want to say that the numbers on the tap package start like 402 or something? But they did not specify what the thread was or how "big" the diameter of the hole is?
I read somewhere that there are certain numbers for the application I'm looking at. If you need to tap with one, then use a second or third to get good threads, I would just need a link for the tools needed to tap and thread a hole for M3.5mm, make sense? I know I'm confusing, but not sure what taps to get???:032: