FREE TABLE!

RECOMMENDED DRILL SIZES

FOR

WOOD SCREWS

Wood Screw Size Major Thread Diameter Thread Depth "F" Diameter of Wood Screw at Bottom of Threads For Hard Woods For Soft Woods

No.

Threads per Inch

O.D.

Max.

Min.

1F

2F

Max.

 

Mean Min. Drill Size Drill Size
2 26 .086 .090 .079 .010 .020 .070 .0645 .059 52 .0635 53 .0595
4 22 .112 .116 .105 .016 .032

.084

.0785 .073

47

.0785

49 .0730
5 20 .125 .129 .118 .018 .036 .093 .0875 .082 44 .0860 45 .0820
6 18 .1375 .142 .131 .020 .040 .102 .0965 .091 41 .0960 43 .0890
7 16 .151 .155 .144 .022 .044 .111 .1055 .100 37 .1040 39 .0995
8 15 .164 .168 .157 .023 .046 .122 .1165 .111 32 .1160 34 .1110
9 14 .177 .181 .170 .026 .052 .129 .1235 .118 31 .1200 32 .1160
10 13 .190 .194 .183 .030 .060 .134 .1285 .123 30 .1285 31 .1200
12 11 .216 .220 .209 .031 .062 .158 .1525 .147 24 .1520 26 .1470
14 10 .242 .246 .235 .035 .070 .176 .1705 .165 18 .1695 20 .1610

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