25th August 2018

boltdepot
13

What size pilot hole to drill for #8 screw?

Wood Screw Pilot Hole Sizes
Screw SizeHard WoodSoft Wood
Tapered BitStraight Bit
#75/32"3/32"
#811/64"7/64"
#93/16"1/8"

Similarly one may ask, what size of drill bit is used for a pilot hole in lumber?

Drill bit sizes for pre-drilling (most commonly used sizes in bold)
Screw SizePilot hole size for hardwoods*Pilot hole size for softwood**
#13/641/32
#23/643/32
#31/163/64
#41/163/64
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