Novice question When drilling a hole to slot a threaded bolt or

Novice question When drilling a hole to slot a threaded bolt or slot drill sizes Buy RS PRO Screwed Slot Drill, 18mm Cut Diameter or other Slot Drills online from RS for next day delivery on your order plus great service and a great slot sultan To prep a through-hole for an M10 x tap, that chart says I'll need an mm drill size for 75% thread engagement in non-ferrous materials

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