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Reference Tables -- Wood Screw Pilot Hole Sizes

 

 
Wood Screw Pilot Hole Sizes
Screw
Size
Body Dia.
Shank
Pilot Hole*
Pilot Hole
in Softwood
Pilot Hole
in Hardwood
0
0.060
1/16
1/64
1/32
1
0.073
5/64
1/32
1/32
2
0.086
3/32
1/32
3/64
3
0.099
7/64
3/64
1/16
4
0.112
7/64
3/64
1/16
5
0.125
1/8
1/16
5/64
6
0.138
9/64
1/16
5/64
7
0.151
5/32
1/16
3/32
8
0.164
11/64
5/64
3/32
9
0.177
3/16
5/64
7/64
10
0.190
3/16
3/32
7/64
11
0.203
13/64
3/32
1/8
12
0.216
7/32
7/64
1/8
14
0.242
1/4
7/64
9/64
16
0.268
17/64
9/64
5/32
18
0.294
19/64
9/64
3/16
20
0.320
21/64
11/64
13/64
24
0.372
3/8
3/16
7/32

These dimensions are for standard American wood screws, which are tapered. They are not suitable for screws which are not tapered, such as dry wall screws. All dimensions are in inches.

* - The shank pilot hole is one which will clear the thickest part of the screw body.

 


 

 

 

 


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