What's inside
As an Amazon Associate I earn from qualifying purchases. This post may contain affiliate links at no extra cost to you.
The right wall anchor depends on the wall, the load, and how often the fastener may be disturbed. Plastic expansion anchors are inexpensive and useful for light loads. Metal expansion anchors generally grip more firmly in solid masonry or drywall, depending on their design. Toggle anchors spread the load behind hollow walls, making them a better choice for heavier items—but they need more space and a larger hole.
Start by identifying the wall material. A magnet can help locate steel studs, while a stud finder can locate wood studs; for heavy or valuable items, fastening into a stud is usually better than relying on a hollow-wall anchor. If you cannot use a stud, choose an anchor designed for the actual wall type and follow its package rating and installation instructions.
What we cover
How the three anchor types work
A plastic expansion anchor goes into a predrilled hole. Driving a screw into it makes the plastic expand and press against the hole’s sides. It is simple and cheap, but its grip depends on the surrounding material. In drywall, it can pull out or crush the paper and gypsum under a concentrated load. In brick or concrete, it can work well when the hole is correctly sized and the masonry is sound.
“Metal anchor” covers several designs. Metal sleeve or wedge-style anchors expand against solid masonry; metal self-drilling drywall anchors cut or form threads in the board. These are not interchangeable. A masonry anchor needs solid material around it, while a self-drilling drywall anchor is meant for a hollow wall and is still limited by the strength and thickness of the drywall.
A toggle anchor uses a bar, wings, or a strap-supported metal piece that opens behind drywall or another hollow panel. The load is spread over a larger area than with an ordinary expansion anchor. Traditional toggles may drop into the cavity if you remove the bolt; strap-style versions often stay in place, but the bolt still has to match the anchor.
Quick comparison
| Type | Best use | Main trade-off | Typical installation consideration |
|---|---|---|---|
| Plastic expansion | Light loads in sound masonry; very light-duty fixtures where appropriate | Lowest cost, but limited holding power in drywall | Drill the specified diameter; avoid enlarging the hole |
| Metal expansion or self-drilling | Solid masonry, or light-to-medium loads in drywall with a drywall-rated design | Stronger or more durable than basic plastic in suitable material, but the design must match the wall | Some designs need a pilot hole; others cut their own hole |
| Toggle | Heavier loads in hollow drywall or panel walls | Better load spread, but larger hole and cavity clearance required | Check wall thickness and space behind the wall |
Choose by wall material
Drywall with no stud: For a small picture or lightweight accessory, a drywall-rated plastic anchor or self-drilling metal anchor may be enough. For a shelf, cabinet, or anything that sticks out from the wall, use a stud where possible. If you cannot, a toggle is often the more sensible choice because the load creates leverage that can pull a small anchor straight through the board.
Brick, block, or concrete: Use an anchor specifically rated for masonry. A plastic expansion plug is often adequate for modest loads in sound material; a metal masonry anchor can offer a more secure hold for a heavier fixture, if its size and installation suit the substrate. Hollow concrete block needs special care: drilling into a hollow cell is not the same as drilling into solid concrete, and an anchor meant for solid material may not hold as expected.
Plaster or old, crumbly walls: Treat the condition of the wall as part of the load rating. A strong anchor cannot compensate for loose plaster or damaged masonry. Drill carefully, stop if the hole crumbles or becomes oversized, and consider finding a stud or using a fastening method specified for the wall assembly.
Match the anchor to the load
Do not choose by a single advertised weight number. Ratings depend on the wall material, wall thickness, anchor size, installation quality, and whether the load pulls straight down or away from the wall. A 20-pound object hung flat against a wall is not necessarily as demanding as a 20-pound shelf with weight near its front edge. For overhead, safety-critical, or high-value installations, use a suitable structural attachment rather than guessing at an anchor rating.
As a practical rule, leave a margin below the manufacturer’s stated rating, especially for a shelf or bracket that may be bumped or loaded unevenly. Use multiple fasteners only when the fixture’s hole spacing and the anchor instructions allow it; closely spaced anchors can weaken the same patch of drywall.
Drill and install without weakening the hole
Use the bit diameter specified on the anchor package. For a plastic or masonry expansion anchor, an oversized hole reduces grip. For a toggle, the hole must be large enough for the folded wings or fitting to pass through, but making it larger than required can leave too little drywall to support the load.
In masonry, use a masonry bit. A hammer drill can speed work in brick or concrete, but use controlled pressure and the mode recommended for the material; hammer action is usually unsuitable for drilling a clean hole in drywall. In drywall, use a standard drill and avoid forcing the bit. A cordless drill is enough for most anchor holes. An impact driver is useful for driving compatible screws, but its high torque can strip plastic anchors or damage drywall if you lean on the trigger.
Before drilling, check for wires and pipes, especially around outlets, switches, and plumbing fixtures. Keep the drill square to the wall, clear dust from masonry holes, and tighten screws only until the fixture is secure. Spinning an anchor or crushing the wall around it is a sign to stop and reassess—not to keep tightening.
What to buy for the job
For a few light-duty fixes in masonry, a plastic masonry anchor assortment is a low-cost starting point. For drywall, choose a package clearly marked for drywall rather than assuming a general-purpose plastic plug will work. A metal self-drilling drywall anchor set suits light-to-medium fixtures when the product rating and wall condition fit the job.
For heavier hollow-wall fixtures, look at toggle bolts for drywall or strap-style toggles. Check the stated wall-thickness range, bolt size, and required hole diameter before buying. If the fixture can be attached to a stud, that is usually the simpler and stronger option.
Signs the anchor is wrong
If the screw spins without tightening, the hole may be too large, the anchor may not suit the wall, or the anchor may have been damaged during installation. If drywall dents, cracks, or bulges as you tighten, stop before mounting the load. If a masonry anchor turns in its hole or the surrounding material breaks away, move to sound material and use an appropriate anchor rather than reusing the damaged hole.
For a small, low-consequence job, a correctly installed plastic anchor can be perfectly adequate. Choose metal or a toggle when the wall type and load call for it—not simply because metal sounds stronger. The best anchor is the one designed for the material it grips, installed in an intact hole and kept within its stated limits.