what size drill bit for 8 screw

For a standard #8 screw, the typical drill bit sizes are:

• Pilot hole in wood (softwood): 7/64 inch
• Pilot hole in wood (hardwood): 1/8 inch
• Pilot hole in metal: 11/64 inch (commonly recommended so the screw can cut properly without stripping)

If you meant 8 mm screw (metric) instead of “#8”:

• For a through-hole (the screw passes freely through): use an 8 mm bit.
• For an anchor/plug rated M8 in masonry: check the plug, but many take a 10 mm masonry bit so the plastic anchor can expand.

Quick Scoop: Why sizes differ

• The pilot hole is usually about the size of the screw’s shank (the solid core without the threads) so the threads still bite firmly.
• Softer materials can use a slightly smaller pilot hole; harder materials need a bit larger pilot to avoid splitting or breaking screws.
• Metal needs a closer fit (like 11/64 inch for #8) so threads form cleanly without over-stressing the screw.

Fast step‑by‑step check

1. Confirm what you actually have: “#8” wood/metal screw (imperial) or 8 mm screw (metric) on the box.
2. Decide material: softwood, hardwood, metal, or wall with anchor.
3. Pick from this mini‑cheat sheet:
   • #8 wood screw → 7/64" (softwood) or 1/8" (hardwood) pilot.
   • #8 screw into metal → 11/64" bit.
   • 8 mm screw through a clearance hole → 8 mm bit.
   • M8 anchor in masonry → normally 10 mm masonry bit, but always follow what’s printed on the anchor.

If you tell me exactly: “#8 wood screw into pine” or “8 mm screw with wall plug in brick,” I can give a one‑line, very specific size recommendation.