Hammer-Set Anchor
Anchors · hammer drive anchor · pin drive anchor · nail drive anchor
Definition: A hammer-set anchor is a one-piece expansion anchor with a pre-installed pin that you hammer flush, expanding the body into concrete or block.
Anatomy & Schematic
■ Body■ Internal thread
Governing standards: Manufacturer specified (no universal standard)
Common Sizes
| Inch | Metric | Head width | Head height |
|---|---|---|---|
| 3/16 | 4.8 mm | 3/16 drill | 1–1-1/4 long |
| 1/4 | 6.4 mm | 1/4 drill | 1–1-3/4 long |
| 5/16 | 8 mm | 5/16 drill | 1-1/4–2 long |
Representative sizes. Full dimensional data lives in the standards listed below.
Grades & Strength
| Grade | Material | Tensile (psi) | Marking |
|---|---|---|---|
| Zinc | zinc-plated steel | — | None |
| Stainless | 304 stainless | — | None |
Materials
- Zinc-plated steel
- Stainless steel
Pros & Cons
Pros
- Hammer-install — no wrench or driver
- Cheap and fast
- Works in block as well as concrete
Cons
- Lower capacity than wedge anchors
- Permanent — must be drilled out
- Pin must be driven fully to set
Typical Uses
- Fastening brackets to concrete
- Conduit and junction boxes
- Block walls
- Quick permanent anchors
Alternatives & Related
- Drop-In Anchor — Female flush anchor for bolts
- Concrete Screw — Removable screw-in fastening
Where to Buy
Affiliate links — we may earn a commission at no cost to you.
FAQ
How does a hammer-set anchor work?
Drill the hole, insert the anchor, and hammer the pin flush. The pin wedges the body open inside the hole, locking it in place.
Hammer-set anchor weight rating?
Roughly 100–400 lb tension in concrete depending on diameter and embedment. Use larger anchors or a wedge anchor for structural loads.