Drywall Anchor
Anchors · wall plug · plastic anchor · conical anchor
Definition: A drywall anchor is a plastic (or metal) sleeve that expands inside wallboard when a screw is driven, holding light to medium fixtures without a stud.
Anatomy
■ Head■ Shank■ Threads■ Point
Governing standards: Manufacturer-rated (no universal standard)
Common Sizes
| Inch | Metric | Head width | Head height |
|---|---|---|---|
| #4–#6 | M3–M3.5 | yellow (typical) | ~20 lb |
| #6–#8 | M3.5–M4 | red (typical) | ~30 lb |
| #8–#10 | M4–M5 | blue (typical) | ~40 lb |
Representative sizes. Full dimensional data lives in the standards listed below.
Grades & Strength
| Grade | Material | Tensile (psi) | Marking |
|---|---|---|---|
| Nylon | nylon (color-coded) | — | Color = size |
| Zinc (metal) | zinc alloy | — | Self-drilling type |
Materials
- Nylon (color-coded by size)
- Zinc alloy (self-drilling)
- Steel (threaded/self-drilling)
Pros & Cons
Pros
- Cheap and quick
- Works in drywall and plaster
- Color coding makes sizing easy
Cons
- Low capacity — light loads only
- Spins if the hole is enlarged
- Struggles in very hard plaster
Typical Uses
- Smoke detectors and towel bars
- Curtain rods
- Light shelves
- Cable clips and small brackets
Alternatives & Related
- Toggle Bolt — For heavy loads on hollow walls
- Molly Bolt — Medium loads with a removable screw
Top Picks
- Drywall anchor kit — Plastic + self-drilling, 200 pcs
Where to Buy
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FAQ
How much weight can a drywall anchor hold?
A plastic conical anchor holds roughly 20–50 lb in sound 1/2 in drywall; threaded self-drilling metal anchors reach ~50 lb; toggles exceed 100 lb. See the weight rating chart.
Can you use drywall anchors in a stud?
No — screw directly into the stud for full strength. Anchors are for the hollow wall between studs.