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I believe that both Helicoils and Timeserts use an STI Tap.
The drilling size for these taps are:
M8 x 1.25 Insert - 8.3mm with a max diameter of the tapped hole being 9.8mm
M12 x 1.5 Insert - 10.3mm with the max diameter of the tapped hole being 12.13mm
I would use a coarse thread into both Aluminium of Magnesium.
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