Wedge Anchor
Anchors · concrete wedge anchor · expansion anchor · stud anchor
Definition: A wedge anchor is a threaded stud with a wedge clip that expands and locks into concrete as the nut is tightened, for very high holding power.
Anatomy & Schematic
■ Head■ Shank■ Threads■ Point
Governing standards: ICC-ES AC193
Common Sizes
| Inch | Metric | Head width | Head height |
|---|---|---|---|
| 1/4 | M6 | 1/4 drill | 1-1/8 min embed |
| 3/8 | M10 | 3/8 drill | 1-1/2 min embed |
| 1/2 | M12 | 1/2 drill | 2-1/4 min embed |
Representative sizes. Full dimensional data lives in the standards listed below.
Grades & Strength
| Grade | Material | Tensile (psi) | Marking |
|---|---|---|---|
| Zinc | zinc-plated carbon steel | — | Indoor use |
| Stainless 304 / 316 | stainless steel | — | Outdoor/corrosive |
| Hot-dip galvanized | galvanized steel | — | Outdoor structural |
Materials
- Zinc-plated steel
- Stainless steel 304 / 316
- Hot-dip galvanized steel
Pros & Cons
Pros
- Highest pull-out strength of mechanical anchors
- Simple hammer-set installation
- Widely available in many finishes
Cons
- Concrete only — can split brick or block
- Permanent (not removable)
- Requires accurate hole depth
Typical Uses
- Handrails and guardrails
- Machinery anchoring
- Ledger boards to concrete
- Structural steel to concrete
Alternatives & Related
- Sleeve Anchor — Works in brick and block too
- Concrete Screw — Removable, no anchor body
Top Picks
- Wedge anchor kit — 1/4–1/2 in, zinc
Where to Buy
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FAQ
Wedge anchor vs sleeve anchor?
Wedge anchors hold best in solid concrete but can crack brick or block. Sleeve anchors are more forgiving in brick, block, and softer concrete, at slightly lower strength.
Can you remove a wedge anchor?
Not practically. The wedge locks permanently in the hole. Cut the stud flush and patch, or leave it. Use a concrete screw if you need removability.