Screw Dimensions

Knowing the dimensions of the screws you are using will help
you decide which screws will work best for your application.
Use the chart below to find the diameter, head size and the proper pilot hole you should be using for screws as small as size 4 or as large as size 14.

Screw Head Diameters
Shank Diameters
Pilot Hole Sizes
Size
Flat Head
Pan/Truss Head
Round Head
Shank Dia.
Hardwood
Softwood
4
7/32"
7/32"
N/A
3/32"
5/64"
1/16"
6
9/32"
17/64"
N/A
1/8"
7/64"
3/32"
8
21/64"
21/64"
3/8"
9/64"
1/8"
7/64"
10
25/64"
3/8"
7/16"
5/32"
9/64"
1/8"
12
7/16"
27/64"
N/A
11/64"
5/32"
9/64"
14
1/2"
31/64"
N/A
13/64"
11/64"
5/32"