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 Size||Pilot hole size for hardwoods*||Pilot hole size for softwood**|
Wood Screw Pilot Hole Sizes
|Screw Size||Hard Wood||Soft Wood|
|Tapered Bit||Straight Bit|
- Wood Screw Pilot Hole Sizes
Screw Size Hard Wood Tapered Bit Straight Bit #9 3/16" 9/64" #10 13/64" 9/64" #12 7/32" 5/32"
- Softwoods aren't weaker than hardwoods. Softwoods come from coniferous trees such as cedar, fir, and pine and tend to be somewhat yellow or reddish. Because most coniferous trees grow fast and straight, softwoods are generally less expensive than hardwoods.
- Uses for Taper Drill Bits. Taper Point Drills were engineered to be used to pre drill the pilot holes for the shank and threaded portion of a wood screw. The object, of course, is to use the proper size drills and drill to the proper depth to insure the best holding power from the wood screw.
Updated: 3rd December 2019