Pilot Hole Diameter for Self Tapping Screws

Gauge (g) Diameter (mm) Sheet Thickness (mm) Sheet Material
From To Steel Aluminium
4 2.9 0.57 1.75 2.30 2.40
1.76 2.50 2.40 2.50
6 3.5 0.56 1.38 2.70 2.80
1.39 2.50 2.80 2.90
2.51 6.00 2.90 3.00
8 4.2 0.89 1.38 3.20 3.30
1.30 3.00 3.30 3.40
3.01 3.50 3.40 3.50
3.51 10.00 3.50-3.60 3.60-3.70
10; 4.8 1.14 1.75 3.70 3.90
1.76 3.00 3.80 3.90
3.01 4.00 3.90 4.00
4.01 4.75 4.00 4.10
4.76 10.00 4.10-4.20 4.20-4.30
12 5.5 1.76 3.00 4.50 4.60
3.01 4.00 4.60 4.70
4.01 4.75 4.70 4.80
4.76 10.00 4.70-4.90 4.80-5.00
14 6.3 2.01 3.00 5.30 5.40
3.01 4.00 5.40 5.50
4.01 5.00 5.50 5.60
5.01 10.00 5.60-5.70 5.70-5.80