Wood Screws - Holes

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

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

Nominal Screw SizeNominal Shank Diameter
(in)
Actual Shank Diameter
(in)
Twist Drill Size
Pilot HolesShank Clearance Holes80o Countersink Diameter
Hard WoodSoft Wood
InchNo.InchesNo.InchNo.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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