Types of Concrete Anchors Explained: How to Choose the Right One for Your Application
Fastener 101 | Anchors
Walk into any job site, and you'll find concrete anchors holding up everything from light-gauge electrical conduit to multi-ton structural steel columns. But not all concrete anchors work the same way, and using the wrong type can result in a connection that pulls out under load, cracks the base material, or simply can't be installed in the first place.
This guide breaks down every major concrete anchor type, how each one works, and when to use it.
How Concrete Anchors Work: The Two Fundamental Mechanisms
Before getting into specific types, it helps to understand that virtually all concrete anchors hold through one of two mechanisms — or a combination of both:
Mechanical interlock (expansion): The anchor expands against the walls of the drilled hole, creating friction and mechanical resistance to pullout. Most traditional anchors work this way.
Chemical bonding (adhesive): An epoxy or hybrid adhesive bonds the anchor rod or rebar directly to the concrete. Adhesive anchors are slower to install but often achieve higher loads and work in situations where mechanical anchors cannot.
Mechanical Anchors
Wedge Anchors
Wedge anchors are the most widely used heavy-duty concrete anchor in construction. They consist of a threaded bolt with a wedge-shaped clip at the base. When the nut is tightened, the wedge is pulled up against the clip, expanding it outward against the hole wall.
How to install: Drill a hole to the specified diameter and depth, insert the anchor through the fixture and into the hole, and tighten the nut. The anchor sets as the nut is torqued.
Best for: Heavy structural loads — machinery, structural steel, guardrails, heavy shelving, and anything that needs a reliable, tested, high-load connection in solid concrete.
Key limitation: Wedge anchors require solid, uncracked concrete. They should not be used near edges (follow minimum edge distance specs) and cannot be removed and reused once set.
Browse our full selection of Wedge Anchors.
Sleeve Anchors
Sleeve anchors consist of a bolt with an expanding sleeve that surrounds the lower portion of the shank. As the nut is tightened, the cone-shaped end of the bolt pulls up into the sleeve, forcing it to expand outward against the hole wall.
How to install: Drill hole, insert anchor through the fixture, hand-tighten the nut, then torque to spec. The sleeve expands within the hole as you tighten.
Best for: Medium-duty applications — electrical conduit, light fixtures, HVAC equipment, door frames, and general construction anchoring into concrete, brick, or block.
Advantage over wedge anchors: Sleeve anchors work in concrete, brick, and hollow block, making them more versatile for masonry applications.
Browse our Sleeve Anchors collection.
Drop-In Anchors
Drop-in anchors are internally threaded, female anchors that are flush-set into the concrete. A setting tool is used to expand a internal wedge inside the anchor body, locking it in place. Once set, a standard bolt threads directly into the anchor.
How to install: Drill hole to exact diameter and depth, drop anchor in, use the setting tool to expand the wedge, then bolt directly into the top.
Best for: Applications where a flush surface is required — overhead anchoring, underside-of-slab connections, and situations where the anchor must sit below or flush with the concrete surface. Common in HVAC suspension, pipe hangers, and overhead equipment mounting.
Key limitation: Drop-in anchors require solid concrete and a precise hole diameter. They are not forgiving of oversized holes.
Browse our Drop-In Anchors.
Drive Anchors (Strike Anchors)
Drive anchors — sometimes called strike anchors or nail anchors — are one of the fastest-installing concrete fasteners available. The anchor is placed in a pre-drilled hole, and a hammer drives a pin through the anchor body, expanding it outward against the hole wall.
How to install: Drill hole, insert anchor, drive pin flush with a hammer or setting tool.
Best for: Light-duty, fast-paced installations — securing sole plates to concrete slabs, attaching furring strips, conduit clips, and other light fixtures where installation speed matters more than maximum load capacity.
Browse our Drive Anchors.
Bolt Anchors
Bolt anchors (also called single- or double-expansion anchors or expansion shields) use a lead or zinc alloy sleeve that expands as a bolt is tightened into it. They are among the oldest concrete anchor designs and remain widely used for light-to-medium duty anchoring.
Best for: Anchoring into concrete, brick, and stone where moderate loads are expected. Common in older construction and masonry applications.
Browse our Bolt Anchors and Expansion Shields.
Concrete Screws (Tapcons)
Concrete screws — widely known by the brand name Tapcon® — are hardened, threaded screws that cut their own threads directly into concrete, brick, or block. No separate anchor is required.
How to install: Drill pilot hole with a hammer drill and carbide bit, then drive the concrete screw directly into the hole.
Best for: Light-to-medium duty applications where speed and removability matter. Electrical boxes, door frames, window frames, furring strips, and conduit straps. Concrete screws can be removed and replaced with a larger diameter screw if needed.
Advantage: The fastest installation of any concrete anchor — one tool, one step.
Browse our Concrete Screws collection.
Toggle Anchors
Toggle anchors use spring-loaded or plastic wings that collapse for insertion through a hole and then spring open behind a hollow wall or thin concrete panel to distribute the load over a wider area.
Best for: Hollow block, hollow concrete masonry units (CMU), drywall over concrete, and thin precast panels where there isn't sufficient material depth for an expansion anchor.
Browse our Toggle Anchors.
Chemical / Adhesive Anchors
Adhesive anchors use a two-part epoxy or hybrid adhesive injected into a pre-drilled, cleaned hole. A threaded rod or rebar is then inserted and held in position while the adhesive cures.
Best for:
- High-load applications that exceed the capacity of mechanical anchors
- Anchoring into cracked concrete (epoxy anchors are rated for cracked concrete; most mechanical anchors are not)
- Close edge distances where expansion would crack the concrete
- Overhead anchoring where vibration could loosen mechanical anchors
- Rebar doweling and post-installed rebar connections
Key consideration: Cure time matters. Adhesive anchors cannot be loaded until fully cured, which varies by product and temperature. Always follow the manufacturer's cure schedule.
Side-by-Side Comparison
| Anchor Type | Load Capacity | Base Material | Removable? | Best Application |
|---|---|---|---|---|
| Wedge Anchor | Heavy | Solid concrete only | No | Structural, machinery, heavy equipment |
| Sleeve Anchor | Medium | Concrete, brick, block | No | HVAC, conduit, general construction |
| Drop-In Anchor | Medium-Heavy | Solid concrete | No | Overhead, flush-surface, pipe hangers |
| Drive Anchor | Light | Concrete, block | No | Sole plates, furring, conduit clips |
| Concrete Screw | Light-Medium | Concrete, brick, block | Yes | Electrical, framing, light fixtures |
| Toggle Anchor | Light-Medium | Hollow block, CMU | No | Hollow masonry, thin panels |
| Adhesive Anchor | Very Heavy | Concrete (cracked or solid) | No | Critical structural, rebar doweling |
Key Installation Tips That Apply to All Concrete Anchors
Match drill bit to anchor diameter exactly. Concrete anchors are engineered for a specific hole size. An oversized hole dramatically reduces holding power. Always use a carbide-tipped hammer drill bit and replace bits that show wear.
Clean the hole. Concrete dust in the hole reduces holding power for both mechanical and adhesive anchors. Blow out with compressed air and, for adhesive anchors, brush and blow multiple times per the manufacturer's instructions.
Respect minimum embedment depth. Every anchor has a minimum embedment depth specification. Shallow embedment is one of the most common causes of anchor failure under load.
Check edge and spacing distances. Anchoring too close to a concrete edge or to another anchor reduces capacity. Follow the manufacturer's minimum edge and spacing requirements, especially for wedge and sleeve anchors.
Shop Concrete Anchors at Mutual Screw
Mutual Screw & Supply carries the full range of concrete anchoring solutions — from everyday concrete screws and drive anchors to heavy-duty wedge anchors and drop-in anchors for structural applications. We also carry complete anchor kits so you have everything you need for the job.
Not sure which anchor is right for your load and substrate? Call us at (800) 222-0324 — our team has been solving fastener problems since 1947.
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