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DIN7984 ←

DIN 7984 (Low Head Cap Screw Hex Drive)

There are DIN6912 which are also Low Head Cap Screw Hex Drive but have the same size hex as the DIN912. They start at M4.

Nominal Size Tapping Drill Size Head Diameter Head Height
M3 2.5 5.5 2
M4 3.3 7 2.8
M5 4.2 8.5 3.3
M6 5 10 4
M8 6.75 13 5