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Engineering ToolBox > Threads - Metric ISO 724
The M Thread - ISO 724:1993 "ISO general-purpose metric screw threads -- Basic dimensions" (DIN 13), the standard in Europe, is recognizable by its cylindrical outer and inner diameter and its precise outer diameter in millimeters.
There are three kinds of ISO metric threads:
The thread angle is 60o. The thread depth is 0.614 x pitch.
Metric threads are designated with a capital M plus an indication to their nominal outer diameter and their pitch:
M size x pitch
For instance:
M10 x 1.5
| Size - Nominal Diameter (mm) | Pitch1) (mm) | Clearance Drill (mm) | Tap Drill (mm) |
| M 1.60 | 0.35 | 1.8 | 1.25 |
| M 2.00 | 0.40 | 2.4 | 1.60 |
| M 2.50 | 0.45 | 2.90 | 2.00 |
| M 3.00 | 0.50 | 3.40 | 2.50 |
| M 3.50 | 0.60 | 3.90 | 2.90 |
| M 4.00 | 0.70 | 4.50 | 3.30 |
| M 5.00 | 0.80 | 5.50 | 4.20 |
| M 6.00 | 1.00 | 6.60 | 5.00 |
| M 8.00 | 1.25 | 9.00 | 6.80 |
| M 10.00 | 1.50 | 12.00 | 8.50 |
| M 12.00 | 1.75 | 14.00 | 10.20 |
| M 14.00 | 2.00 | 16.00 | 12.00 |
| M 16.00 | 2.00 | 18.00 | 14.00 |
| M 20.00 | 2.50 | 22.00 | 17.50 |
| M 22.00 | 2.50 | 25.00 | 19.50 |
| M 24.00 | 3.00 | 27.00 | 21.00 |
| M 27.00 | 3.00 | 30.00 | 24.00 |
| M 30.00 | 3.50 | 33.00 | 26.50 |
| M 36.00 | 4.00 | 40.00 | 32.00 |
| M 42.00 | 4.50 | 46.00 | 37.50 |
| M 48.00 | 5.00 | 53.00 | 43.00 |
| M 56.00 | 5.50 | 62.00 | 50.50 |
| M 64.00 | 6.00 | 70.00 | 58.00 |
| M 68.00 | 6.00 | 74.00 | 62.00 |
1) For metric threads pitch is the distance between threads.
| Size - Nominal Diameter (mm) | Pitch1) (mm) | Tap Drill (mm) |
| M 1.0x0.2 | 0.20 | 0.80 |
| M 1.1x0.2 | 0.20 | 0.90 |
| M 1.2x0.2 | 0.20 | 1.00 |
| M 1.4z0.2 | 0.20 | 1.20 |
| M 1.6x0.2 | 0.20 | 1.40 |
| M 1.8x0.2 | 0.20 | 1.60 |
| M 2x0.25 | 0.25 | 1.75 |
| M 2.2x0.25 | 0.25 | 1.95 |
| M 2.5x0.35 | 0.35 | 2.10 |
| M 3x0.35 | 0.35 | 2.60 |
| M 3.5x0.35 | 0.35 | 3.10 |
| M 4x0.5 | 0.50 | 3.50 |
| M 4.5x0.5 | 0.50 | 4.00 |
| M 5x0.5 | 0.50 | 4.50 |
| M 5.5x0.5 | 0.50 | 5.00 |
| M 6x0.75 | 0.75 | 5.20 |
| M 7x0.75 | 0.75 | 6.20 |
| M 8x0.75 | 0.75 | 7.20 |
| M 8x1.0 | 1.00 | 7.00 |
| M 9x0.75 | 0.75 | 8.20 |
| M 9x 1 | 1.00 | 8.00 |
| M 10x0.75 | 0.75 | 9.20 |
| M 10x1 | 1.00 | 9.00 |
| M 10x1.25 | 1.25 | 8.80 |
| M 11x0.75 | 0.75 | 10.20 |
| M 11x1 | 1.00 | 10.00 |
| M 12x1 | 1.00 | 11.00 |
| M 12x1.25 | 1.25 | 10.80 |
| M 12x1.5 | 1.50 | 10.50 |
| M 14x1.0 | 1.00 | 13.00 |
| M 14x1.25 | 1.25 | 12.80 |
| M 14x1.5 | 1.50 | 12.50 |
| M 15x1 | 1.00 | 14.00 |
| M 15x1.5 | 1.50 | 13.50 |
| M 16x1 | 1.00 | 15.00 |
| M 16x1.5 | 1.50 | 14.50 |
| M 17x1.0 | 1.00 | 16.00 |
| M 17x1.5 | 1.50 | 15.50 |
| M 18x1.0 | 1.00 | 17.00 |
| M 18x1.5 | 1.50 | 16.50 |
| M 18x2.0 | 2.00 | 16.00 |
| M 20x1.0 | 1.00 | 19.00 |
| M 20x1.5 | 1.50 | 18.50 |
| M 20x2.0 | 2.00 | 18.00 |
| M 22x1.0 | 1.00 | 21.00 |
| M 22x1.5 | 1.50 | 20.50 |
| M 22x2.0 | 2.00 | 20.00 |
| M 24x1.0 | 1.00 | 23.00 |
| M 24x1.5 | 1.50 | 22.50 |
| M 24x2.0 | 2.00 | 22.00 |
| M 25x1.0 | 1.00 | 24.00 |
| M 25x1.5 | 1.50 | 23.50 |
| M 25x2.0 | 2.00 | 23.00 |
| M 27x1.0 | 1.00 | 26.00 |
| M 27x1.5 | 1.50 | 25.50 |
| M 27x2.0 | 2.00 | 25.00 |
| M 28x1.0 | 1.00 | 27.00 |
| M 28x1.5 | 1.50 | 26.50 |
| M 28x2.0 | 2.00 | 26.00 |
| M 30x1.0 | 1.00 | 29.00 |
| M 30x1.5 | 1.50 | 28.50 |
| M 30x2.0 | 2.00 | 28.00 |
| M 30x3.0 | 3.00 | 27.00 |
| M 32x1.5 | 1.50 | 30.50 |
| M 32x2.0 | 2.00 | 30.00 |
| M 33x1.5 | 1.50 | 31.50 |
| M 33x2.0 | 2.00 | 31.00 |
| M 33x3.0 | 3.00 | 30.00 |
| M 35x1.5 | 1.50 | 33.50 |
| M 35x2.0 | 2.00 | 33.00 |
| M 36x1.5 | 1.50 | 34.50 |
| M 36x2.0 | 2.00 | 34.00 |
| M 36x3.0 | 3.00 | 33.00 |
| M 39x1.5 | 1.50 | 37.50 |
| M 39x2.0 | 2.00 | 37.00 |
| M 39x3.0 | 3.00 | 36.00 |
| M 40x1.5 | 1.50 | 38.50 |
| M 40x2.0 | 2.00 | 38.00 |
| M 40x3.0 | 3.00 | 37.00 |
| M 42x1.5 | 1.50 | 40.50 |
| M 42x2.0 | 2.00 | 40.00 |
| M 42x3.0 | 3.00 | 39.00 |
| M 42x4.0 | 4.00 | 38.00 |
| M 45x1.5 | 1.50 | 43.50 |
| M 45x2.0 | 2.00 | 43.00 |
| M 45x3.0 | 3.00 | 42.00 |
| M 45x4.0 | 4.00 | 41.00 |
| M 48x1.5 | 1.50 | 46.50 |
| M 48x2.0 | 2.00 | 46.00 |
| M 48x3.0 | 3.00 | 45.00 |
| M 48x4.0 | 4.00 | 44.00 |
| M 50x1.5 | 1.50 | 48.50 |
| M 50x2.0 | 2.00 | 48.00 |
| M 50x3.0 | 3.00 | 47.00 |
| M 52x1.5 | 1.50 | 50.50 |
| M 52x2.0 | 2.00 | 50.00 |
| M 52x3.0 | 3.00 | 49.00 |
| M 52x4.0 | 4.00 | 48.00 |
| M 55x1.5 | 1.50 | 53.50 |
| M 55x2.0 | 2.00 | 53.00 |
| M 55x3.0 | 3.00 | 52.00 |
| M 55x4.0 | 4.00 | 51.00 |
| M 56x1.5 | 1.50 | 54.50 |
| M 56x2.0 | 2.00 | 54.00 |
| M 56x3.0 | 3.00 | 53.00 |
| M 56x4.0 | 4.00 | 52.00 |
| M 58x1.5 | 1.50 | 56.50 |
| M 58x2.0 | 2.00 | 56.00 |
| M 58x3.0 | 3.00 | 55.00 |
| M 58x4.0 | 4.00 | 54.00 |
| M 60x1.5 | 1.50 | 58.50 |
| M 60x2.0 | 2.00 | 58.00 |
| M 60x3.0 | 3.00 | 57.00 |
| M 60x4.0 | 4.00 | 56.00 |
| M 62x1.5 | 1.50 | 60.50 |
| M 62x2.0 | 2.00 | 60.00 |
| M 62x3.0 | 3.00 | 59.00 |
| M 62x4.0 | 4.00 | 58.00 |
| M 64x1.5 | 1.50 | 62.50 |
| M 64x2.0 | 2.00 | 62.00 |
| M 64x3.0 | 3.00 | 61.00 |
| M 64x4.0 | 4.00 | 60.00 |
| M 65x1.5 | 1.50 | 63.50 |
| M 65x2.0 | 2.00 | 63.00 |
| M 65x3.0 | 3.00 | 62.00 |
| M 65x4.0 | 4.00 | 61.00 |
| M 68x1.5 | 1.50 | 66.50 |
| M 68x2.0 | 2.00 | 66.00 |
| M 68x3.0 | 3.00 | 65.00 |
| M 68x4.0 | 4.00 | 64.00 |
| M 70x1.5 | 1.50 | 68.50 |
| M 70x2.0 | 2.00 | 68.00 |
| M 70x3.0 | 3.00 | 67.00 |
| M 70x4.0 | 4.00 | 66.00 |
| M 70x6.0 | 6.00 | 64.00 |
| M 72x1.5 | 1.50 | 70.50 |
| M 72x2.0 | 2.00 | 70.00 |
| M 72x3.0 | 3.00 | 69.00 |
| M 72x4.0 | 4.00 | 68.00 |
| M 72x6.0 | 6.00 | 66.00 |
| M 75x1.5 | 1.50 | 73.50 |
| M 75x2.0 | 2.00 | 73.00 |
| M 75x3.0 | 3.00 | 72.00 |
| M 75x4.0 | 4.00 | 71.00 |
| M 75x6.0 | 6.00 | 69.00 |
| M 76x1.5 | 1.50 | 74.50 |
| M 76x2.0 | 2.00 | 74.00 |
| M 76x3.0 | 3.00 | 73.00 |
| M 76x4.0 | 4.00 | 72.00 |
| M 76x6.0 | 6.00 | 70.00 |
| M 80x1.5 | 1.50 | 78.50 |
| M 80x2.0 | 2.00 | 78.00 |
| M 80x3.0 | 3.00 | 77.00 |
| M 80x4.0 | 4.00 | 76.00 |
| M 80x6.0 | 6.00 | 74.00 |
| M 85x2.0 | 2.00 | 83.00 |
| M 85x3.0 | 3.00 | 82.00 |
| M 85x4.0 | 4.00 | 81.00 |
| M 85x6.0 | 6.00 | 79.00 |
| M 90x2.0 | 2.00 | 88.00 |
| M 90x3.0 | 3.00 | 87.00 |
| M 90x4.0 | 4.00 | 86.00 |
| M 90x6.0 | 6.00 | 84.00 |
| M 95x2.0 | 2.00 | 93.00 |
| M 95x3.0 | 3.00 | 92.00 |
| M 95x4.0 | 4.00 | 91.00 |
| M 95x6.0 | 6.00 | 89.00 |
| M 100x2.0 | 2.00 | 98.00 |
| M 100x3.0 | 3.00 | 97.00 |
| M 100x4.0 | 4.00 | 96.00 |
| M 100x6.0 | 6.00 | 94.00 |