Drill bit sizes for wood screws

  Screw Gage    Shank    Shank     Pilot     Pilot
   Number        Hole    Size      Soft Wd   Hard Wd
       0         1/16    .060      1/64      1/32
       1         5/64    .073      1/32      1/32
       2         3/32    .086      1/32      3/64
       3         7/64    .099      3/64      1/16
       4         7/64    .112      3/64      1/16
       5         1/8     .125      1/16      5/64
       6         9/64    .138      1/16      5/64
       7         5/32    .151      1/16      3/32
       8         11/64   .164      5/64      3/32
       9         3/16    .177      5/64      7/64
      10         3/16    .190      3/32      7/64
      11         13/64             3/32      1/8
      12         7/32    .216      7/64      1/8
      14         1/4     .242      7/64      9/64
      16         17/64   .268      9/64      5/32
      18         19/64   .294      9/64      3/16
      20         21/64   .320      11/64     13/64

http://www.woodmagazine.com/compstor/screwchart.pdf

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