METRIC TAP / DRILL SIZES
TAP SIZE			TAP DRILL SIZE
M1.5 x 0.35			1.10
M2 x 0.4			1.60
M2 x 0.45			1.50
M2 x 0.5			1.50
M2.3 x 0.4			1.90
M2.5 x 0.45			2.00
M2.6 x 0.45			1.10
M3 x 0.5			2.50
M3 x 0.6			2.40
M3 x 0.75			2.25
M3.5 x 0.6			2.90
M4 x 0.7			3.30
M4 x 0.75			3.25
M4.5 x 0.75			3.75
M5 x 0.75			4.25
M5 x 0.8			4.20
M5 x 0.9			4.10
M5 x 1			4.00
M5.5 x 0.75			4.75
M5.5 x 0.9			4.60
TAP SIZE			TAP DRILL SIZE
M6 x 1			5.00
M6 x 1.25			4.80
M7 x 1			6.00
M7 x 1.25			5.80
M8 x 1			7.00
M8 x 1.25			6.80
M9 x 1			8.00
M9 x 1.25			7.80
M10 x 1.25			8.80
M10 x 1.5			8.60
M11 x 1.5			9.60
M12 x 1.25			11.00
M12 x 1.5			10.50
M12 x 1.75			10.50
M13 x 1.5			11.50
M13 x 1.75			11.50
M13 x 2			11.00
M14 x 1.25			13.00
M14 x 1.75			12.50
TAP SIZE			TAP DRILL SIZE
M14 x 2			12.00
M15 x 1.75			13.50
M15 x 2			13.00
M16 x 2			14.00
M17 x 2			15.00
M18 x 1.5			16.50
M18 x 2			16.00
M18 x 2.5			15.50
M19 x 2.5			16.50
M20 x 2			18.00
M20 x 2.5			17.50
M22 x 2.5			19.50
M24 x 3			21.00
M26 x 3			23.00
M27 x 3			24.00
M28 x 3			25.00
M30 x 3.5			26.50
M32 x 3.5			28.50
M33 x 3.5			29.50
M34 x 3.5			30.50
M36 x 4			32.00
M38 x 4			34.00