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Proper Drill Bit Size
for Drilling Pilot Holes & Shank Holes

SCREW GAGE
NUMBER		 SHANK HOLE
HARD & SOFT WOOD		 PILOT HOLE
SOFT WOOD		 PILOT HOLE
HARD WOOD
0
1
2
3
4
5
6
7
8
9
10
11
12
14
16
18
20		 1/16"
5/64"
3/32
7/64"
7/64"
1/8"
9/64"
5/32"
11/64"
3/16"
3/16"
13/64"
7/32"
1/4"
17/64"
19/64"
21/64"		 1/64"
1/32"
1/32"
3/64"
3/64"
1/16"
1/16"
1/16"
5/64"
5/64"
3/32"
3/32"
7/64"
7/64"
9/64"
9/64
11/64"		 1/32"
1/32"
3/64"
1/16"
1/16"
5/64"
5/64"
3/32"
3/32"
7/64"
7/64"
1/8"
1/8"
9/64"
5/32"
3/16"
13/64"