Wood Screws - Holes

Pilot holes, shank clearance holes and countersink diameter - hard wood and soft wood

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Approximate hole sizes for wood screws - hard wood and soft wood - are indicated below:

Nominal Screw Size Nominal Shank Diameter
(in)		 Actual Shank Diameter
(in)		 Twist Drill Size
Pilot Holes Shank Clearance Holes 80o Countersink Diameter
Hard Wood Soft 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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