Machinery's Handbook, 31st Edition
1856 Metric Self-Threading Screws Table 10. Approximate Drilled or Clean-Punched Hole Sizes for Steel Type B Metric Thread Forming Tapping Screws in Sheet Metal and Cast Metals Nominal Screw Size and Thread Pitch Metal Thick ness Hole Size Drill Size a Nominal Screw Size and Thread Pitch Metal Thick ness Hole Size Drill Size a Nominal Screw Size and Thread Pitch Metal Thick ness Hole Size Drill Size a
In Steel, Stainless Steel, Monel, and Brass Sheet Metal
0.38 0.46 0.61 0.76 0.91 1.22 1.52 0.38 0.46 0.61 0.76 0.91 1.22 1.52 1.90 0.38 0.46 0.61 0.76 0.91 1.22 1.52 0.61 0.76 0.91 1.22 1.52 0.76 0.91 1.22 1.52 1.90 2.67 0.76 0.91 1.22 1.52 1.90 2.67 3.25
1.63 52 1.63 52 1.70 51 1.78 50 1.85 49 1.85 49 1.93 48 2.18 44 2.18 44 2.26 43 2.39 42 2.39 42 2.44 41 2.54 39 2.59 38 2.64 37 2.64 37 2.69 36 2.69 36 2.79 35 2.82 34 2.95 32 1.63 52 1.63 52 1.63 52 1.70 51 1.78 50 2.18 44 2.18 44 2.18 44 2.26 43 2.26 43 2.39 42 2.64 37 2.64 37 2.64 37 2.69 36 2.79 35 2.82 34
1.90 2.67 0.61 0.76 0.91 1.22 1.52 1.90 2.67 3.18 3.43 0.61 0.76 0.91 1.22 1.52 1.90 2.67 3.18 3.43 4.17 0.76 0.91 1.22 1.52 1.90 2.67 3.18 3.43 4.11 9.52 0.91 1.22 1.52 to 1.90 2.67 3.18 3.43 4.17 5.08
3.05 31 3.25 30 3.18 … 3.18 … 3.18 … 3.25 30 3.45 29 3.56 28 3.81 25 3.81 25 3.86 24 3.66 27 3.66 27 3.73 26 3.86 24 3.86 24 3.99 22 4.09 20 4.32 18 4.32 18 4.39 17 2.95 32 3.05 31 3.25 30 3.45 29 3.56 28 3.73 26 3.73 26 3.78 25 3.86 24 3.66 27 3.66 27 3.66 27 3.73 26 3.73 26 3.91 23 3.91 23 4.04 21
0.61 0.76 0.91 1.22 1.52 1.90 2.67 3.18 3.43 4.17 0.76 0.91 1.22 1.52 1.90 2.67 3.18 3.43 4.17 4.75 4.93 1.22 1.52 1.90 2.67 3.18 3.43 4.17 5.08 9.52 1.52 1.90 2.67 to 3.18 3.43 4.17 4.75 4.93 5.08
4.22 19 4.22 19 4.22 19 4.32 18 4.50 16 4.62 14 4.70 13
3.5 × 1.3
2.2 × 0.8
5.5 × 1.8
4.2 × 1.4
4.98 4.98 5.11
9 9 7
4.93 10 4.93 10 4.93 10
2.9 × 1
5.05 5.18 5.31 5.79 5.79 5.94 5.94 5.94
8 6 4 1 1
6.3 × 1.8
4.8 × 1.6
… … …
3.5 × 1.3
In Aluminum Alloy Sheet Metal
4.09 20 4.22 19 4.39 17 4.57 15 4.62 14 4.62 14 4.80 12
2.2 × 0.8
5.5 × 1.8
4.2 × 1.4
2.9 × 1
4.98 5.05 5.11 5.18 5.31 5.31 5.41 5.41 5.61
9 8 7 6 4 4 3 3 2
3.5 × 1.3
6.3 × 1.8
4.8 × 1.6
to
6.25
3.05 31
to
to
9.52
5.79
1
9.52 4.22 19 a Customary drill size references have been retained where the metric hole diameters are direct conversions of their decimal inch equivalents. In Aluminum, Magnesium, Zinc, Brass, and Bronze Cast Metals Nominal
Nominal Screw Size and Thread Pitch
Min. Penetration in Blind Holes
Min. Penetration in Blind Holes
Screw Size and Thread Pitch
Hole Size 4.50 5.05 5.94
Drill Size a
Hole Size 1.98 2.64 3.25 3.86
Drill Size a
47 37 30 24
3.18 4.78 6.35 6.35
16
6.35 7.14 7.92
2.2 × 0.8 2.9 × 1 3.5 × 1.3 4.2 × 1.4
4.8 × 1.6 5.5 × 1.8 6.3 × 1.8
8 4
…
… …
…
All dimensions are in millimeters, except drill sizes.
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