A stripped screw has a worn recess, so the bit spins instead of gripping. The usual fix is to add grip, change how you apply force, or grab the head from the outside. Work through the gentle methods first and keep the drastic ones for last.
Try These Grip Tricks First
Before you reach for anything destructive, check that the bit matches the head in both size and drive type. A bit that is slightly too small is the most common reason a screw strips in the first place.
- Press the bit firmly into the recess and turn slowly with steady downward force. Much of the slipping comes from too little pressure.
- Lay a wide rubber band or a scrap of thin cloth over the head, press the bit through it, and turn slowly. The material fills the worn gaps.
- Try a bit one size larger, or a different drive style that bites into the damaged edges.
- Tap the bit lightly into the head with a hammer to seat it, then turn again.
When the Head Sits Proud
If the head stands above the surface, you can grab it from the outside. Locking pliers clamp onto the rim and give plenty of leverage. Squeeze them firmly, then turn slowly counterclockwise. If the screw sits in thin or soft material, support the back side so the part does not bend.
Another option is to cut a fresh slot across the head with a small rotary tool or a hacksaw blade, then use a flat screwdriver. Wear eye protection, and follow the maker’s manual for any power tool you use.
Using a Screw Extractor
A screw extractor set is made for this exact job. The general approach is:
- Drill a small guide hole in the center of the screw head with the bit size the extractor set calls for.
- Tap or twist the extractor into the hole so it bites.
- Turn it counterclockwise with a wrench or tap handle, keeping the force even.
Go slowly. Extractors are hard and can snap if forced, which makes the problem worse. A little rust-release oil can help on screws that have sat for years.
Prevent It Next Time
- Match the bit exactly to the screw head and replace worn bits; worn bits strip screws.
- Drill a pilot hole in hardwood or near board edges.
- Set a low clutch setting on a drill, and finish the last turns by hand.
- Keep the tool square to the screw so the bit does not climb out.
FAQ
Can I use a power drill to back out a stripped screw?
Yes, at low speed and with firm pressure, especially with a bit that grips the damaged recess. High speed usually polishes the head smooth, so go slowly.
What if the screw head snaps off?
You can drill out the remaining shank or use an extractor on what is left. If the part matters, take it to a qualified repairer rather than forcing it.
The Short Version
Add grip with a rubber band or a better-fitting bit, grab raised heads with locking pliers, and use a screw extractor as the last step. Work slowly, wear eye protection, and check the maker’s manual for your tools.