Symptoms
- Screw spins in place without advancing
- Anchor spins freely in the wall instead of biting in
- Hole feels loose or larger than the anchor/screw
- Screw goes in but doesn't hold weight afterward
Likely causes
- CommonPilot hole too large for the anchor or screwAn oversized hole gives nothing for the threads to grip.
- CommonDrilling into a spot with no stud and only drywall/plasterDrywall alone has limited holding strength without a proper anchor rated for it.
- PossibleWrong anchor type for the wall material or weight loadPlastic anchors, toggle bolts, and self-drilling anchors each suit different situations.
- PossibleScrew driven too fast, stripping the drywall paper and gypsum around itHigh speed can chew up the material it's supposed to grip.
- PossibleOld, damaged, or crumbling wall material at that spotWater damage or age can weaken drywall/plaster locally, causing it to give way at that point.
What to do
- Confirm what's behind the wall using a stud finder before drilling, and aim for a stud when possible for real strength.
- Match the pilot hole size exactly to the anchor manufacturer's recommendation, not just close enough.
- For drywall-only mounting, use a rated drywall anchor (plastic expansion, self-drilling, or toggle) sized for the weight you're hanging.
- Drive screws at a slower, controlled speed once they contact the anchor to avoid stripping it.
- If a hole becomes stripped or oversized, fill it with a wood toothpick and wood glue (or spackle for drywall) and let it dry before retrying, or move a half-inch over and try a fresh hole.
- For heavier items, use a stud or a heavy-duty toggle anchor rather than relying on a light-duty plastic anchor.
Tools and parts
- Stud finder
- Appropriate wall anchors
Drywall anchor kit assorted sizesSearch: “drywall wall anchor kit”
Toggle bolt heavy duty anchorSearch: “heavy duty toggle bolt wall anchor”
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.