Pilot Hole Size

Wood Screw Pilot Hole Sizes


Screw Size
Hard Wood
Soft Wood
Countersink Size
Tapered Bit
Straight Bit
Tapered Bit
Straight Bit
3/32"
1/16"
5/64"
1/16"
1/4"
7/64"
5/64"
3/32"
1/16"
1/4"
1/8"
3/32"
7/64"
5/64"
5/16"
9/64"
7/64"
1/8"
3/32"
5/16"
5/32"
7/64"
1/8"
3/32"
5/16"
11/64"
1/8"
5/32"
7/64"
3/8"
3/16"
9/64"
11/64"
1/8"
3/8"
13/64"
9/64"
3/16"
1/8"
7/16"
7/32"
5/32
13/64"
9/64"
7/16"
1/4"
11/64"
15/64"
5/32"
1/2"
9/32"
3/16"
17/64"
11/64"
9/16"
5/16"
7/32"
19/64"
13/64"
5/8"
#20
21/64"
15/64"
5/16"
7/32"
3/4"
#24
3/8"
17/64"
3/8"
1/4"
3/4"

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