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" |