Machinery's Handbook, 31st Edition
Metric Self-Threading Screws 1855 Table 8. Approximate Hole Sizes for Steel Type AB Metric Thread Forming Tapping Screws in Plywoods and Asbestos Nominal
Penetration in Blind Holes
Penetration in Blind Holes
Screw Size and Thread Pitch
Min. Mat. Thickness
Min. Mat. Thickness
Hole Size
Drill Size a
Hole Size
Drill Size a
Min.
Max.
Min.
Max.
In Plywood (Resin Impregnated)
In Asbestos Compositions
1.85 2.54 3.18 3.66 4.39 4.93 5.79
49 39
3.18 4.78
4.78 12.70 1.93 6.35 15.88 2.57 6.35 15.88 3.05 6.35 19.05 3.73 7.92 25.40 4.22 9.52 25.40 4.98 9.52 25.40 5.79
48 38 31 26 19
3.18 4.78 4.78 7.92 7.92 7.92
4.78 12.70 6.35 15.88 6.35 15.88 9.52 19.05 9.52 25.40 9.52 25.40
2.2 × 0.8
2.9 × 1
… 4.78
3.5 × 1.3 4.2 × 1.4 4.8 × 1.6 5.5 × 1.8
27 17 10
4.78 6.35 7.92 7.92
9 1
6.3 × 1.8 11.13 12.70 25.40 a Customary drill size references have been retained where the metric hole diameters are direct conversions of their decimal inch equivalents. All dimensions are in millimeters except drill sizes. Table 9. Approximate Hole Sizes for Steel Type B Metric Thread Forming Tapping Screws in Plywoods, Asbestos, and Plastics Nominal Screw Size and Thread Pitch Hole Size 1 Drill Size a Min. Mat. Thick ness Penetration in Blind Holes Min. Max. Nominal Screw Size and Thread Pitch Hole Size Drill Size a Min. Mat. Thick ness Penetration in Blind Holes Min. Max.
In Plywood (Resin Impregnated)
1.85 2.54 3.18 3.66
49 39
3.18 4.78 12.70 4.8 × 1.6 4.78 6.35 15.88 5.5 × 1.8
4.39 4.93 5.79
17 10
6.35 7.92 25.40 7.92 9.52 25.40 7.92 9.52 25.40
2.2 × 0.8 2.9 × 1 3.5 × 1.3 4.2 × 1.4
… 4.78 6.35 15.88 6.3 × 1.8
1
27 … … … … … … a Customary drill size references have been retained where the metric hole diameters are direct conversions of their decimal inch equivalents. Nominal Screw Size and Thread Pitch Hole Size 4.78 6.35 19.05 Drill Size a Min. Mat. Thickness Penetration in Blind Holes Min. Max.
In Asbestos Compositions
1.93 2.57 3.05 3.73 4.22 4.98 5.79
48 38 31 26 19
3.18 4.78 4.78 7.92
4.78 6.35 6.35 9.52
12.70 15.88 15.88 19.05 25.40 25.40 25.40
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
7.92 7.92 11.13
9.52 9.52 12.70
9 1
Nominal Screw Size and Thread Pitch
Hole Size
Drill Size a
Min. Penetration in Blind Holes
Hole Size
Drill Size a
Min. Penetration in Blind Holes
In Cellulose Acetate and Nitrate, Acrylic and Styrene Resins
In Phenol Formaldehyde
1.98 2.54 3.25 3.81 4.50 5.05 5.94
47 39 30 25 16
4.78 6.35 6.35 7.92 7.92 9.52 9.52
1.98 2.39 3.05 3.66 4.32 4.85 5.61
47 42 32 27 18 11
4.78 6.35 6.35 7.92 7.92 9.52 9.52
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
…
2
All dimensions are in millimeters except drill sizes.
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