WOOD SCREW DATA

N = NOMINAL SIZE
T = THREADS PER INCH
D = DIAMETER OF UNTHREADED ROOT (in)
B = BODY DRILL SIZE (in)
S = PILOT DRILL SIZE IN SOFT WOOD (in)
H = PILOT DRILL SIZE IN HARD WOOD (in)

 N         T           D                    B           S         H         B          S          H
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 0         32        .060                 52        75        66
 1         28        .073                 47        71        57
 2         26        .086                 42        65        54
 3         24        .099                 37        58        53
 4         22        .112                 32        55        51        1/8       1/16     5/64
 5         20        .125                 30        53        47        9/64     5/64     3/32
 6         18        .138                 27        52        44        9/64     5/64     3/32
 7         16        .151                 22        51        39        5/32     3/32     7/64
 8         15        .164                 18        48        35        11/64   3/32     7/64
 9         14        .177                 14        45        33        3/16     7/64     1/8
10        13        .190                 10        43        31        3/16     7/64     1/8
11                    .203                 4          40        29
12        11        .216                 2          38        25        7/32     1/8       5/32
14        10        .242                 D         32        14
16         9         .268                 I           29        10
18         8         .294                 N         26        6
20         8         .320                 P          19        3
24         7         .372                 V         15        D