You buy a curtain rod, dump the hardware bag onto the kitchen counter, and there sit two ribbed plastic sleeves the size of pencil stubs. Most people toss them in a drawer and screw straight into the drywall. Then the rod rips out of the wall six months later. So what are the plastic things that come with screws? They are drywall anchors, and they are the single most misunderstood piece of hardware in any homeowner’s toolbox.
- The Short Answer: Plastic Drywall Anchors
- Conical Plastic Anchors (Ribbed Plugs)
- Self-Drilling Threaded Anchors (E-Z Anchor)
- Molly Bolts (Hollow-Wall Anchors)
- Toggle Bolts and Strap Toggles
- How to Pick the Right Anchor for Your Project
- Installation Tips That Make Anchors Actually Hold
- When to Skip Anchors and Hit a Stud
- Quick Reference for Your Junk Drawer
The Short Answer: Plastic Drywall Anchors
Those ribbed plastic tubes are called expansion anchors or conical wall plugs, depending on shape. They give the screw something to grip in soft drywall, which by itself crumbles under any real load. A screw driven directly into 1/2-inch gypsum board holds maybe 5 to 8 pounds before the threads strip. Add the right plastic anchor and the same screw can hold 20 to 40 pounds.
The anchors come in five common styles, and using the wrong one is the difference between a TV that stays on the wall and a $1,200 trip to Best Buy.
Conical Plastic Anchors (Ribbed Plugs)
The most common kind. Tan or yellow, ribbed sides, hollow center, tapered tip. You drill a pilot hole matching the anchor’s outside diameter, tap the anchor flush with a hammer, then drive the screw, which spreads the anchor walls against the back of the drywall.
Rating: 10 to 15 pounds of static pull-out load in 1/2-inch drywall. Use for picture frames, light shelves, small clocks, and decorative hooks. Cost: about $4 per pack of 100 at Lowe’s or Home Depot.
Self-Drilling Threaded Anchors (E-Z Anchor)
The white or yellow plastic ones with deep helical threads on the outside. You drive them directly into drywall with a Phillips screwdriver, no pilot hole needed, then run the screw into the center. E-Z Anchor by Hillman is the dominant brand at about $6 for a 25-pack.
Rating: 30 to 50 pounds for plastic versions, up to 75 pounds for metal Zinc versions. Best for medium-weight shelving, mirrors, and towel bars. They cannot be reused once removed because the threads chew up the hole.
Molly Bolts (Hollow-Wall Anchors)
The metal sleeves with a built-in screw and a small flange. Insert into a pre-drilled hole, tighten the screw, and the back end mushrooms behind the drywall, locking it in permanently. The screw can be removed and replaced without losing the anchor.
Rating: 25 to 50 pounds depending on size. Excellent for items you might want to remove later, like grab bars in a guest bath or a coat rack that gets relocated. Cost: $5 to $10 for a pack of 25.
Toggle Bolts and Strap Toggles
The heavy-duty option. A spring-loaded wing-shaped metal piece folds flat to slide through a drilled hole, then snaps open behind the drywall. The screw threads pull the toggle tight against the back of the wall.
Standard butterfly toggles hold 50 to 100 pounds. The newer SnapToggle by Toggler, at $1.50 each, holds up to 265 pounds in 1/2-inch drywall when installed correctly. This is the right anchor for a 65-inch flat-screen TV bracket if you cannot hit a stud.
How to Pick the Right Anchor for Your Project
Weight rating is only half the story. You also need to match anchor type to the load direction.
- Pictures and frames under 10 lbs: conical plastic anchor with #6 screw
- Floating shelves up to 25 lbs per anchor: E-Z Anchor self-drilling, two minimum
- Towel bars and grab bars: Molly bolts or hit a stud directly
- Wall-mounted mirrors over 30 lbs: SnapToggle, four anchors minimum
- TVs over 32 inches: always into studs, toggle bolts only as backup
- Curtain rods at window ends: E-Z Anchor or hit the king stud
The rule of thumb: divide the rated load by three for safety margin. An anchor stamped “30 lbs” should hold 10 lbs in real-world use, especially for dynamic loads that get bumped or tugged.
Installation Tips That Make Anchors Actually Hold
Use the drill bit size printed on the anchor package, not whatever was in the chuck. A 1/64-inch oversize hole drops holding power by 30% or more. Drill straight in, not at an angle. Stop the drill at the depth the anchor needs; deeper holes weaken the surrounding drywall paper.
For ribbed anchors, the anchor head should sit flush with the wall surface, never proud. If you cannot tap it flush, the hole is too small and the anchor will split when you drive the screw. For self-drilling anchors, drive them in slowly with hand pressure, not a power drill on high speed, to avoid stripping the threads at the drywall paper.
When to Skip Anchors and Hit a Stud
Drywall anchors are a workaround. The strongest mount is always a wood screw driven into a stud. Find studs with a magnetic stud finder like the Franklin Sensors ProSensor 710 at $50, which detects nail heads and edges accurately through 1.5 inches of drywall.
Studs typically sit 16 inches on center in modern homes, 24 inches on center in some older construction. For TVs, heavy shelves, and grab bars in bathrooms (ADA requires 250 lb pull-out per code), screw directly into the stud with #10 or #12 wood screws at least 2.5 inches long. No anchor needed.
Quick Reference for Your Junk Drawer
Keep a small organizer with a 25-pack each of conical plastic anchors, E-Z Anchors, Molly bolts, and SnapToggles. Total cost about $30. Add a 5/16-inch and 3/8-inch drill bit, plus a stud finder. With that kit, you can hang almost anything in your house safely, and you will never have to wonder again what the plastic things in the hardware bag are for.
