Wood Screw Diameters

Size Number Major Thread Diameter*
Decimal Nearest Fractional Measurement
0 .060 1/16
1 .073 5/64
2 .086 3/32
3 .099 7/64
4 .112 7/64
5 .125 1/8
6 .138 9/64
7 .151 5/32
8 .164 5/32
9 .177 11/64
10 .190 3/16
11 .203 13/64
12 .216 7/32
14 .242 1/4
16 .268 17/64
18 .294 19/64
20 .320 5/16

* Major thread diameter is measured on the outside of the threads.
For more information about how to measure diameter see our Measuring Fastener Diameter page.