How to Use Metal Drywall Anchors? | Fixing Them Right

Hanging a shelf or towel bar often means hitting empty space behind half an inch of drywall. Screws alone will pull right out, which is why metal drywall anchors exist. These hollow-wall fasteners bite into the panel from behind, giving a screw something solid to hold onto. The right technique comes down to picking the correct anchor type, drilling the right hole, and setting it flush before you tighten the final screw. The whole job takes a few minutes per anchor and calls for nothing more than a drill, a screwdriver, and the anchor pack itself.

What Are Metal Drywall Anchors and When Do You Need Them?

Metal drywall anchors are hollow-wall fasteners designed to hold screws in drywall where there is no stud behind the panel. They spread load across the back of the drywall rather than relying on the screw’s threads biting into the face. These anchors suit medium-duty jobs like curtain rods, small shelves, and bathroom fixtures.

Light loads, such as a small picture, often work fine with a simple plastic expansion anchor. Heavy items like large mirrors or floating shelves really need a stud or a toggle bolt rated for the weight. Metal anchors sit in the middle, giving more strength than basic plastic types without the complexity of a full toggle installation.

The Correct Way to Install Metal Drywall Anchors

The core installation sequence works the same across every style: mark the spot, confirm nothing is behind the wall, drill the right pilot hole, insert the anchor flush, then tighten the screw. Following this order prevents the anchor from spinning, stripping, or pulling loose later.

1. Mark the location on the wall with a pencil, level in hand for anything wider than a single anchor.
2. Check for studs, wires, and plumbing. Run a stud finder across the area or tap the wall to hear a solid thud where a stud sits. Avoid drilling where wires or pipes likely run.
3. Drill the pilot hole at the size printed on the anchor package. If the pack lists no size, use a bit slightly smaller than the anchor barrel.
4. Insert the anchor until the collar sits flush with the drywall surface. Tap it gently with a hammer if needed.
5. Install the screw and tighten until the anchor grips securely. Stop as soon as the screw meets firm resistance, since overtightening can strip the drywall threads.

You will know the anchor set correctly when it holds firmly without spinning as the screw tightens. A properly seated anchor will not turn in the hole when you apply steady screwdriver pressure.

Which Metal Anchor Type Should You Use?

Three main metal anchor styles cover most household needs, and each one installs slightly differently. Self-drilling types skip the pilot hole, molly-style anchors expand behind the wall, and toggle-style anchors use spring-loaded wings for the heaviest loads.

Self-drilling anchors suit light to medium loads and go in fast since they cut their own threads. Molly-style anchors provide solid all-around performance and remain the default choice for most home projects. Toggle anchors handle the most weight but require a larger hole and a bit more patience during installation.

What Mistakes Ruin a Metal Anchor Installation?

The most common failure is overtightening the screw, which strips the anchor’s grip on the drywall and leaves it spinning uselessly in the hole. Using the wrong pilot-hole size causes similar trouble, where an undersized hole cracks the panel and an oversized one lets the anchor turn freely.

Drilling into a stud is another frequent error. A metal anchor will not penetrate wood, so if your drill stops short or meets solid resistance, you have hit a stud. Remove the anchor and drive a wood screw directly into the stud instead. The same advice applies when an anchor spins or refuses to set properly: pull it out and use the correct size or a different type rather than forcing it.

Check the wall for electrical wires and plumbing before drilling, since a misplaced hole can cause serious damage. When weighing how much an anchor can hold, Lowe’s advises using only 25 percent of the manufacturer’s total rated capacity for your application.

For heavier-duty needs, a quality anchor rated for substantial weight makes the difference between a shelf that stays put and one that ends up on the floor. Our roundup of the best drywall anchors for heavy items compares the top options so you can match the right fastener to your project before you start drilling.