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US Wood Screws - Nominal Sizes

Wood screws - nominal sizes vs. diameters.

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Wood screws shank diameters and recommended pilot holes are indicated below.

Wood screws - shank diameters and pitot holes

Shank holes and pilot holes is recommended to prevent wood from splitting and allows tighter joints.

Nominal Size
Shank Diameter
Nearest Fractional
0 0.060 1/16
1 0.073 5/64
2 0.086 3/32
3 0.099 7/64
4 0.112 7/64
5 0.125 1/8
6 0.138 9/64
7 0.151 5/32
8 0.164 5/32
9 0.177 11/64
10 0.190 3/16
11 0.203 13/64
12 0.216 7/32
14 0.242 1/4
16 0.268 17/64
18 0.294 19/64
20 0.320 5/16
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