Drywall alone can't support much weight — a screw driven straight into it will eventually pull through. The right anchor spreads that load across a wider area of the wall, and choosing the wrong type is the single most common reason a shelf, mirror, or TV mount ends up on the floor.
What’s in this guide
How drywall anchors actually hold weight
Standard drywall is roughly 1/2" of gypsum board — strong in a flat sheet, but weak against a concentrated point of pressure like a screw. An anchor's entire job is to distribute that pressure over a wider area behind the wall surface, either by expanding against the back of the drywall (toggle-style anchors) or by threading into the gypsum itself and gripping a larger surface area than the screw alone (self-drilling and expansion anchors).
The weight an anchor can hold depends on two things: how much surface area it spreads the load across, and how well it's seated in solid, undamaged drywall. A perfectly rated anchor installed in a hole that's too large, or into drywall that's already cracked, will still fail.
Plastic vs. metal anchors, side by side
| Factor | Plastic anchors | Metal anchors (toggle/hollow-wall) |
|---|---|---|
| Typical weight rating | Light to moderate (a few pounds up to ~25 lbs, model-dependent) | Heavy (often 50–100+ lbs, model-dependent) |
| Installation | Simple — often just drill and tap in | More involved — requires a larger hole and toggle mechanism to deploy behind the wall |
| Cost | Lower cost, sold in larger packs | Higher cost per anchor |
| Removability | Easy to remove, though the plastic body is usually disposable | Toggle wings remain behind the wall permanently once deployed |
| Best for | Picture frames, small shelves, light decor | TV mounts, heavy shelving, mirrors, anything load-bearing |
Choosing an anchor for light loads
For anything under roughly 10–15 lbs — picture frames, small floating shelves, curtain hardware, light decor — a plastic self-drilling or expansion anchor is usually sufficient and far faster to install than a metal toggle system.
- Self-drilling plastic anchors screw directly into the drywall without a pilot hole, making them the fastest option for small jobs
- Standard expansion plastic anchors need a pre-drilled pilot hole but hold slightly more weight than self-drilling versions
Match the anchor size to your screw diameter — an anchor that's too loose around the screw won't grip properly, and one that's too tight can crack during installation.
Get plastic anchors sized for picture frames, small shelves, and everyday light-duty mounting
Shop Plastic Drywall Anchors →Choosing an anchor for heavy loads
For anything in the 25 lb+ range — TV mounts, heavy mirrors, wall-mounted shelving with real storage weight, curtain rods carrying heavy drapes — a metal toggle-style anchor is the safer choice. These anchors work by folding flat to pass through the drilled hole, then springing open (or being screwed into a butterfly shape) once behind the drywall, spreading the load across metal wings rather than relying on the plastic or gypsum alone.
- Spring-loaded toggle bolts pop open automatically once through the hole — simple and reliable for most heavy-duty jobs
- Self-drilling metal anchors thread directly into the drywall with a screwdriver, no pre-drilling needed, and offer strong holding power for their size
- Strap toggles allow the wings to be pulled snug against the back of the drywall before the screw is driven, useful in tighter installation spaces
Installation basics that matter
- Drill the exact hole size specified — too large and the anchor won't grip; too small and it can crack the drywall or the anchor itself on insertion
- Check for pipes and wiring before drilling, especially near outlets, switches, or bathrooms/kitchens
- Don't overtighten — cranking a screw too far into a toggle anchor can strip the threads or crush the drywall around the anchor, weakening the hold
- Space multiple anchors apart on wider items like shelves, rather than clustering them, to distribute weight more evenly across the wall
Frequently asked questions
How do I know if there's a stud behind my wall?
A stud finder is the fastest and most reliable method. In a pinch, tapping the wall and listening for a more solid (versus hollow) sound can help locate a stud, but a stud finder removes the guesswork and is worth having for any mounting project.
Can I reuse a drywall anchor hole if I remove the anchor?
Plastic anchors can sometimes be removed and the hole patched, but the hole is rarely reusable for a new anchor at full strength. Metal toggle anchors are essentially permanent once the wings deploy behind the wall — plan on patching and choosing a slightly different spot if you need to relocate.
What happens if I use a light-duty anchor for a heavy item?
The anchor will eventually pull through the drywall under sustained weight, sometimes gradually (a picture frame slowly tilting) and sometimes suddenly. Always match the anchor's rated weight capacity to the actual load, with some margin for safety.
Are metal anchors always better than plastic ones?
Not necessarily better, just built for a different weight range. Metal toggle anchors are overkill (and more expensive and harder to install) for something like a small picture frame, where a simple plastic anchor does the job just as reliably.
Bottom line
Matching anchor type to actual load is the whole game — plastic anchors handle light, everyday mounting quickly and cheaply, while metal toggle anchors carry real weight when a stud isn't available. Check for a stud first, drill the exact hole size specified, and don't overtighten during installation. Get those basics right and whatever you're hanging stays hung.
Need serious holding power? Get metal toggle anchors rated for TVs, mirrors, and heavy shelving
Shop Metal Drywall Anchors →
