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US Wood Screws - Pilot Holes

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Approximate hole size for wood screws used in hard wood and soft wood:

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US Wood Screws - Pilot Holes
Nominal Size
no.		Nominal Shank Diameter
(in)

Actual Shank Diameter
(in)

Twist Drill Size
Pilot HolesShank Clearance Holes80o Countersink Diameter
Hard WoodSoft Wood
Inch

No.Inches

No.Inch

No.Actual Head Diameter
(in)

Diameter
(in)
0 0.060 0.064 3/64 58 1/32 69 1/16 52 0.119 1/8
1 0.073 0.077 3/64 55 1/32 65 5/64 47 0.146 3/16
2 0.086 0.090 1/16 53 3/64 59 3/32 42 0.172 3/16
3 0.099 0.103 1/16 51 3/64 56 7/64 37 0.199 1/4
4 0.112 0.116 5/64 48 3/64 55 7/64 32 0.225 1/4
5 0.125 0.129 5/64 44 1/16 53 1/8 30 0.252 1/4
6 0.138 0.142 3/32 42 1/16 52 9/64 27 0.279 3/8
7 0.151 0.155 3/32 38 1/16 50 5/32 22 0.305 3/8
8 0.164 0.168 7/64 35 5/64 48 11/64 18 0.332 3/8
9 0.177 0.181 1/8 32 5/64 46 3/16 14 0.358 3/8
10 0.190 0.194 1/8 30 3/32 44 3/16 10 0.385 1/2
11 0.203 0.207 1/8 29 3/32 43 13/64 4 0.412 1/2
12 0.216 0.220 9/64 27 3/32 39 7/32 2 0.438 1/2
14 0.242 0.246 5/32 20 7/64 34 1/4 D 0.507 1/2
16 0.268 0.272 3/16 16 1/8 31 17/64 I 0.544 5/8
18 0.294 0.298 3/16 10 9/64 29 19/64 N 0.635 5/8
20 0.320 0.324 7/32 3 5/32 26 21/64 P 0.650 3/4
24 0.372 0.376 1/4 D 11/64 18 3/8 V 0.762 3/4
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