Pick the Right Drywall Anchor for the Job

The Problem

You grab a random wall anchor from the junk drawer, shove it in, and hope for the best. Then your shelf slowly pulls away from the wall because you used a plastic expansion anchor where you needed a toggle bolt. Every anchor type has a different mechanism — and understanding what's actually happening behind the drywall helps you pick the right one.

The Main Types and When to Use Them

Light duty (under 15 lbs) — picture frames, small shelves

• Plastic expansion anchors: The most common type. You drill a hole, push the anchor in, and drive a screw. The plastic splits and expands outward behind the wall. Cheap and easy, but they pull out under moderate weight. Fine for picture frames, not much else.

Medium duty (15–50 lbs) — towel bars, curtain rods, light shelving

• Self-drilling (threaded) anchors: These have coarse threads on the outside and screw directly into drywall without a pre-drilled hole. They grip by threading into the gypsum itself. Much stronger than plastic expansion anchors.

• Molly bolts (hollow wall anchors): You tap these into a pre-drilled hole, then tighten the screw. The metal sleeve behind the wall collapses and spreads flat against the back of the drywall, creating a wide grip area. Very secure but leave a big hole if you remove them.

Heavy duty (50+ lbs) — TV mounts, heavy shelving, grab bars

• Toggle bolts: A spring-loaded metal toggle folds to fit through a drilled hole, then opens behind the wall. When you tighten the bolt, the toggle presses flat against the back of the drywall. These can hold serious weight — 50 to 100+ lbs depending on size.

• Snap toggles (strap toggles): Similar concept to toggle bolts but with a plastic strap that lets you remove and reinsert the bolt without losing the toggle behind the wall. Easier to work with and reusable.