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There are three kinds of ISO metric threads:

Designation

Metric threads are designated with a capital M plus an indication to their nominal outer diameter and their pitch:

For instance:

M10 x 1.5

Metric Threads - Coarse Thread Pitches

M 1.60 0.35 1.8 1.25

M 2.00 0.4 2.4 1.6

M 2.50 0.45 2.9 2M 3.00 0.5 3.4 2.5

M 3.50 0.6 3.9 2.9

M 4.00 0.7 4.5 3.3

M 5.00 0.8 5.5 4.2

M 6.00 1 6.6 5

M 8.00 1.25 9 6.8

M 10.00 1.5 12 8.5

M 12.00 1.75 14 10.2

M 14.00 2 16 12

M 16.00 2 18 14

M 20.00 2.5 22 17.5

M 22.00 2.5 25 19.5

M 24.00 3 27 21

M 27.00 3 30 24

M 30.00 3.5 33 26.5

M 36.00 4 40 32

M 42.00 4.5 46 37.5

M 48.00 5 53 43

M 56.00 5.5 62 50.5

M 64.00 6 70 58

M 68.00 6 74 62

The M Thread - ISO 724:1993 "ISO general-purpose metric screw threads -- Basic dimensions" (DIN 13), the standard in Europe, is recognizable byits cylindrical outer and inner diameter and its precise outer diameter in millimeters.

coarse

fine

extra fine

The thread angle is 60o. The thread depth is 0.614 x pitch.

M size xpitch

Size - Nominal Diameter(mm)

Pitch1)(mm)

Clearance Drill(mm)

Tap Drill(mm)

1) For metric threads pitch is the distance between threads.

1 mm ~= 0.03937 inches

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Metric Threads - Fine Thread PitchesSize Size

M 1.0x0.2 0.2 0.8 M 45x3.0 3 42

M 1.1x0.2 0.2 0.9 M 45x4.0 4 41

M 1.2x0.2 0.2 1 M 48x1.5 1.5 46.5

M 1.4z0.2 0.2 1.2 M 48x2.0 2 46

M 1.6x0.2 0.2 1.4 M 48x3.0 3 45

M 1.8x0.2 0.2 1.6 M 48x4.0 4 44

M 2x0.25 0.25 1.75 M 50x1.5 1.5 48.5

M 2.2x0.25 0.25 1.95 M 50x2.0 2 48

M 2.5x0.35 0.35 2.1 M 50x3.0 3 47

M 3x0.35 0.35 2.6 M 52x1.5 1.5 50.5

M 3.5x0.35 0.35 3.1 M 52x2.0 2 50

M 4x0.5 0.5 3.5 M 52x3.0 3 49

M 4.5x0.5 0.5 4 M 52x4.0 4 48

M 5x0.5 0.5 4.5 M 55x1.5 1.5 53.5

M 5.5x0.5 0.5 5 M 55x2.0 2 53

M 6x0.75 0.75 5.2 M 55x3.0 3 52

M 7x0.75 0.75 6.2 M 55x4.0 4 51

M 8x0.75 0.75 7.2 M 56x1.5 1.5 54.5

M 8x1.0 1 7 M 56x2.0 2 54

M 9x0.75 0.75 8.2 M 56x3.0 3 53

M 9x 1 1 8 M 56x4.0 4 52

M 10x0.75 0.75 9.2 M 58x1.5 1.5 56.5

M 10x1 1 9 M 58x2.0 2 56

M 10x1.25 1.25 8.8 M 58x3.0 3 55

M 11x0.75 0.75 10.2 M 58x4.0 4 54

M 11x1 1 10 M 60x1.5 1.5 58.5

M 12x1 1 11 M 60x2.0 2 58

M 12x1.25 1.25 10.8 M 60x3.0 3 57

M 12x1.5 1.5 10.5 M 60x4.0 4 56

M 14x1.0 1 13 M 62x1.5 1.5 60.5

M 14x1.25 1.25 12.8 M 62x2.0 2 60

M 14x1.5 1.5 12.5 M 62x3.0 3 59

M 15x1 1 14 M 62x4.0 4 58

M 15x1.5 1.5 13.5 M 64x1.5 1.5 62.5

M 16x1 1 15 M 64x2.0 2 62

M 16x1.5 1.5 14.5 M 64x3.0 3 61

M 17x1.0 1 16 M 64x4.0 4 60

M 17x1.5 1.5 15.5 M 65x1.5 1.5 63.5

M 18x1.0 1 17 M 65x2.0 2 63

M 18x1.5 1.5 16.5 M 65x3.0 3 62

M 18x2.0 2 16 M 65x4.0 4 61

M 20x1.0 1 19 M 68x1.5 1.5 66.5

M 20x1.5 1.5 18.5 M 68x2.0 2 66

M 20x2.0 2 18 M 68x3.0 3 65

M 22x1.0 1 21 M 68x4.0 4 64

M 22x1.5 1.5 20.5 M 70x1.5 1.5 68.5

M 22x2.0 2 20 M 70x2.0 2 68

M 24x1.0 1 23 M 70x3.0 3 67

M 24x1.5 1.5 22.5 M 70x4.0 4 66

M 24x2.0 2 22 M 70x6.0 6 64

M 25x1.0 1 24 M 72x1.5 1.5 70.5

M 25x1.5 1.5 23.5 M 72x2.0 2 70

Pitch1)(mm)

Tap Drill(mm)

Pitch1)(mm)

Tap Drill(mm)

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M 25x2.0 2 23 M 72x3.0 3 69

M 27x1.0 1 26 M 72x4.0 4 68

M 27x1.5 1.5 25.5 M 72x6.0 6 66

Size Size

M 27x2.0 2 25 M 75x1.5 1.5 73.5

M 28x1.0 1 27 M 75x2.0 2 73

M 28x1.5 1.5 26.5 M 75x3.0 3 72

M 28x2.0 2 26 M 75x4.0 4 71

M 30x1.0 1 29 M 75x6.0 6 69

M 30x1.5 1.5 28.5 M 76x1.5 1.5 74.5

M 30x2.0 2 28 M 76x2.0 2 74

M 30x3.0 3 27 M 76x3.0 3 73

M 32x1.5 1.5 30.5 M 76x4.0 4 72

M 32x2.0 2 30 M 76x6.0 6 70

M 33x1.5 1.5 31.5 M 80x1.5 1.5 78.5

M 33x2.0 2 31 M 80x2.0 2 78

M 33x3.0 3 30 M 80x3.0 3 77

M 35x1.5 1.5 33.5 M 80x4.0 4 76

M 35x2.0 2 33 M 80x6.0 6 74

M 36x1.5 1.5 34.5 M 85x2.0 2 83

M 36x2.0 2 34 M 85x3.0 3 82M 36x3.0 3 33 M 85x4.0 4 81

M 39x1.5 1.5 37.5 M 85x6.0 6 79

M 39x2.0 2 37 M 90x2.0 2 88

M 39x3.0 3 36 M 90x3.0 3 87

M 40x1.5 1.5 38.5 M 90x4.0 4 86

M 40x2.0 2 38 M 90x6.0 6 84

M 40x3.0 3 37 M 95x2.0 2 93

M 42x1.5 1.5 40.5 M 95x3.0 3 92

M 42x2.0 2 40 M 95x4.0 4 91

M 42x3.0 3 39 M 95x6.0 6 89

M 42x4.0 4 38 M 100x2.0 2 98

M 45x1.5 1.5 43.5 M 100x3.0 3 97

M 45x2.0 2 43 M 100x4.0 4 96

M 100x6.0 6 94

Pitch1)(mm)

Tap Drill(mm)

Pitch1)(mm)

Tap Drill(mm)