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Pilot Hole Sizes for Wood Screws

Screw Size Hard Wood Soft Wood Countersink Size
Tapered Bit Straight Bit Tapered Bit Straight Bit
#2 3/32" 1/16" 5/64" 1/16" 1/4"
#3 7/64" 5/64" 3/32" 1/16" 1/4"
#4 7/64" 5/64" 3/32" 1/16" 1/4"
#5 1/8" 3/32" 7/64" 5/64" 5/16"
#6 9/64" 7/64" 1/8" 3/32" 5/16"
#7 5/32" 7/64" 9/64" 3/32" 5/16"
#8 11/64" 1/8" 5/32" 7/64" 3/8"
#9 3/16" 9/64" 11/64" 1/8" 3/8"
#10 13/64" 9/64" 3/16" 1/8" 7/16"
#12 7/32" 5/32" 13/64" 9/64" 7/16"
#14 1/4" 11/64" 15/64" 5/32" 1/2"
#16 9/32" 3/16" 17/64" 11/64" 9/16"
#18 5/16" 7/32" 19/64" 13/64" 5/8"
#20 21/64" 15/64" 5/16" 7/32" 3/4"
#24 3/8" 17/64" 3/8" 1/4" 3/4"