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US Wood Screws - Pilot Holes

Hard wood and soft wood pilot holes, shank clearance holes and countersink diameters

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Wood screws - shank diameters and pitot holes

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

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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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