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Metric Tap & Drill Chart

The twist drill bit was invented by Steven A. Morse of East Bridgewater, MA, in 1861. He received U.S. Patent 38,119 for his invention on April 7, 1863. The original method of manufacture was to cut two grooves in opposite sides of a round bar, then to twist the bar to produce the helical flutes. This gave the tool its name.

Nowadays, the drill bit is usually made by rotating the bar while moving it past a grinding wheel to cut the flutes in the same manner as cutting helical gears. Tools recognizable as twist drill bits are currently produced in diameters covering a range from 0.05 mm (0.002") to 100 mm (4"). Lengths up to about 1000 mm (39") are available for use in powered hand tools.

The geometry and sharpening of the cutting edges is crucial to the performance of the bit. Users often throw away small bits that become blunt, and replace them with new bits, because they are inexpensive and sharpening them well is difficult. For larger bits, special grinding jigs are available. A special tool grinder is available for sharpening or reshaping cutting surfaces on twist drills to optimize the drill for a particular material. -Wikipedia

Standard metric tap & drill size chart


Coarse Thread   Fine Thread
Thread
Size
Tap Drill
Diameter
(mm)
Thread
Size
Tap Drill
Diameter
(mm)
M1x0.25 0.75 M4x0.35 3.6
M1.1x0.25 0.85 M4x0.5 3.5
M1.2x0.25 0.95 M5x0.5 4.5
M1.4x0.3 1.1 M6x.5 5.5
M1.6x0.35 1.25 M6x.75 5.25
M1.7x0.35 1.3 M7x.75 6.25
M1.8x0.35 1.45 M8x.5 7
M2x0.4 1.6 M8x.75 7.25
M2.2x0.45 1.75 M8x1 7.5
M2.5x0.45 2.05 M9x1 8
M3x0.5 2.5 M10x0.75 9.25
M3.5x0.6 2.9 M10x1 9
M4x0.7 3.3 M10x1.25 8.8
M4.5x0.75 3.7 M11x1 10
M5x0.8 4.2 M12x.75 11.25
M6x1 5 M12x1 11
M7x1 6 M12x1.5 10.5
M8x1.25 6.8 M14x1 13
M9x1.25 7.8 M14x1.25 12.8
M10x1.5 8.5 M14x1.5 12.5
M11x1.5 9.5 M16x1 15
M12x1.75 10.2 M16x1.5 14.5
M14x2 12 M18x1 17
M16x2 14 M18x2 16
M18x2.5 15.5 M20x1 19
M20x2.5 17.5 M20x1.5 18.5
M22x2.5 19.5 M20x2 18
M24x3 21 M22x1 21
M27x3 24 M22x1.5 20.5
M30x3.5 26.5 M22x2 20
M33x3.5 29.5 M24x1.5 22.5
M36x4 32 M24x2 22
M39x4 35 M26x1.5 24.5
M42x4.5 37.5 M27x1.5 25.5
M45x4.5 40.5 M27x2 25
M48x5 43 M28x1.5 26.5
M52x5 47 M30x1.5 28.5
M56x5.5 50.5 M30x2 28
M60x5.5 54.5 M33x2 31
M64x6 58 M36x3 33
M68x6 60 M39x3 36

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Webmaster:
    Kirt Blattenberger,
    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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