FAQ
TL;DR: Use wood or standard twist bits sized to your screw; 0.3 mm bits exist. "Even 0.3 mm… 2.5; 2; 1.5; 1 mm." Countersink for flush heads; don’t oversize pilots. [Elektroda, zworys, post #18029077]
Why it matters: This FAQ helps DIY woodworkers choose the right bit and pilot size to avoid splitting and weak joints.
Quick Facts
- Wood drill bits are specially profiled for clean drilling in wood; use them for screw pilots. [Elektroda, sanfran, post #18025324]
- A drill with a countersink makes a neat recess for screw heads; avoid oversizing the pilot. [Elektroda, zworys, post #18025299]
- Many modern screws can be driven without predrilling; pilot only in tougher cases. [Elektroda, zimny8, post #18025231]
- For large holes (≥8 mm), use wood bits; ordinary metal bits handle smaller holes. [Elektroda, mod22, post #18025350]
- Twist-bit sizes go down to 0.3 mm; sub‑1 mm sets often pair with Dremel tools. [Elektroda, zworys, post #18029077]
Which drill bit type should I use to drill screw holes in wood?
Use wood drill bits when drilling wood. They are specially profiled for clean, accurate holes. Drill pilots where needed, then drive the screws. Avoid aggressive countersinking in fragile slats that split easily. [Elektroda, sanfran, post #18025324]
Do I need a pilot hole, or can I drive wood screws directly?
Many modern wood screws drive without a pilot hole. In some extreme cases, predrill to avoid problems. [Elektroda, zimny8, post #18025231]
Is a 3 mm drill bit OK for all screws?
No. Match the drill diameter to the specific screw you plan to use. "You choose the diameter of the drill according to the screw diameter." A single 3 mm bit will not fit all screws. [Elektroda, Loker, post #18028905]
Are smaller than 3 mm drill bits available?
Yes. Bits are available down to 0.3 mm, including 2.5 mm, 2 mm, 1.5 mm, and 1 mm. Modeling kits often include sub‑millimeter bits that fit rotary tools like Dremel. [Elektroda, zworys, post #18029077]
How do I drill and countersink for a flush screw head?
Countersink to recess the head after drilling the pilot. A drill with a countersink "nicely makes a recess for the screw heads." Do not oversize the pilot or the screw will not hold.
How‑To:
- Drill the pilot hole.
- Create the countersink recess.
- Drive the screw until the head sits flush. [Elektroda, zworys, post #18025299]
Can I use metal drill bits on wood?
Yes. You can drill wood, including hardwoods like oak, with ordinary metal drill bits. For larger holes, around 8 mm and up, switch to wood bits sharpened for wood. These bits look similar but have different sharpening. [Elektroda, mod22, post #18025350]
What bit should I use for 8 mm and larger holes in wood?
Use special wood drills for holes around 8 mm and larger. They look similar to metal drills but are sharpened differently. [Elektroda, mod22, post #18025350]
When should I avoid countersinking?
Avoid countersinking when driving screws into slats that tend to break. In such pieces, the countersink can "take revenge" and cause splitting. [Elektroda, sanfran, post #18025324]
Should I buy a Confirmat drill bit for general wood screws?
Buy a Confirmat drill only if you use Confirmat screws for furniture assembly. It is not the right choice for typical wood screws outside furniture work. [Elektroda, mod22, post #18025837]
What if my pilot hole ends up too big?
If the drilled hole is too large in diameter, the screw will not hold properly. Size the pilot conservatively to maintain holding strength. [Elektroda, zworys, post #18025299]
What tools are best for micro pilot holes?
Use modeling micro-bits for tiny pilots, including 1 mm and below. These sets often pair with compact rotary tools like Dremel. [Elektroda, zworys, post #18029077]
Does the screw type matter when choosing a drill bit?
Yes. Bit choice depends on the screws you plan to use, including their diameter and head. Be specific about the screws, not just the drill. [Elektroda, enhanced, post #18024378]