Concrete Screws

Concrete Screw + Masonry Screw Anchor Selection — Quick Reference

Concrete screws (masonry screw anchors / self-tapping masonry screws) thread DIRECTLY into pre-drilled concrete + brick + block + masonry WITHOUT shield or expansion. Self-tapping flutes cut threads in masonry as installed. Faster than expansion anchors.

Critical: Drill hole DIAMETER MATCH spec exactly — typically 1mm smaller than screw diameter. Clean dust from hole before insertion. Don't reuse hole — second installation has reduced grip. Embedment depth MINIMUM 25mm into solid concrete. Concrete strength minimum 20 MPa typical. Compare with mechanical anchors (sleeve + chemical) for higher loads. Brands: Dynabolt, Mungo, Ramset. Companion: masonry anchors, concrete anchors, sleeve anchors.

Concrete Screws and Masonry Screw Anchors for Australian Industry

Concrete screws — also called masonry screw anchors or self-tapping masonry screws — thread directly into pre-drilled concrete, brick, block, and masonry without needing a separate anchor or plug. They're a fast, reliable fixing solution for trade, maintenance, and construction work across Australia. AIMS Industrial stocks masonry screw anchors from Champion, Hobson, and Bremick in hex head and countersunk configurations.

How concrete screws work

Unlike sleeve anchors or drop-in anchors, concrete screws cut their own thread into the base material as they're driven. Drill the correct diameter pilot hole (undersize to the screw OD), clean the hole, and drive the screw in — no expansion, no separate anchor component. The thread engagement with the masonry provides the holding strength. Removal is also possible in most applications, unlike expansion anchors which can't be removed cleanly.

Head styles

• Hex head (hex washer head) — faster install with an impact driver or socket; better for structural and high-volume fixing where appearance isn't critical
• Countersunk (flat head) — sits flush to the surface; used where a protruding head would be a trip hazard, obstruction, or cosmetic issue

Choosing the right size

Concrete screw performance depends on embedment depth (how far into the substrate the screw reaches beyond the fixture being fastened). Minimum embedment is typically 25mm; deeper embedment increases pullout resistance. For structural or safety-critical applications, refer to the manufacturer's load tables and apply appropriate safety factors. Common diameters stocked are 6mm, 7.5mm, and 10mm.

Base material compatibility

Concrete screws perform best in solid concrete and dense brick or block. Performance in lightweight aerated concrete (Hebel/AAC) is lower — check manufacturer load data for these substrates and consider lower working loads. Not suitable for use in cracked or deteriorated concrete.

Related fixings

For heavier-duty masonry fixing, see our masonry and concrete anchors range (sleeve, wedge, drop-in). For timber-to-masonry fixing, see our structural screws.

Need help selecting the right masonry fixing for a specific load or substrate? contact our team — we'll work through the application.

People Also Ask — Concrete Screws

Q: What are concrete screws?

Concrete screws (also called masonry screws or Tapcon-style screws) thread directly into concrete or masonry without requiring expansion anchors or wall plugs. Self-cutting threads (sharp serrated thread profile) cut into the concrete to form a positive mechanical bond. Used for: light to medium-duty fixings in concrete and brick, electrical conduit mounting, sign installations, light bracket attachments, and any application requiring quick masonry fixing without expansion devices. Sized by diameter (6mm, 8mm, 10mm) and length (30-150mm typical).

Q: Concrete screw vs mechanical anchor?

Concrete screw: drill hole, drive screw — fast installation, no expansion mechanism, smaller hole size. Best for light to medium-duty fixings. Lower load capacity than expansion anchors. Mechanical expansion anchor: drill hole, insert anchor, tighten to expand — higher load capacity, larger hole. Best for structural fixings. For workshop fixtures, light brackets, electrical conduit: concrete screws. For structural loads or heavy-duty: expansion anchors. Match to load requirement.

Q: How do I install concrete screws correctly?

1. Drill pilot hole using the matched-size carbide bit (typically slightly smaller than screw OD — manufacturer specifies). 2. Clean dust from hole (essential for full thread engagement). 3. Drive concrete screw with impact driver or socket — let threads cut their own engagement. 4. Don't over-torque — strips threads in concrete. Stop driving when head bottoms out against fixture. Match screw length to: fixture thickness + 20-25mm embedment minimum.

Q: What anchor depth (embedment) do I need?

Typical concrete screw embedment: 20-40mm depending on screw diameter and load. M6 screws: 25mm minimum. M8: 30mm minimum. M10: 40mm minimum. Higher loads require deeper embedment. Match drill depth: drill 10-15mm deeper than embedment depth to allow for dust accumulation. The manufacturer's data sheet specifies embedment for rated loads. Insufficient embedment dramatically reduces holding power.

Q: Stainless or galvanised concrete screws?

Standard zinc-plated steel: indoor and protected outdoor applications. Cost-effective. Galvanised (hot-dip galvanised or mechanically galvanised): outdoor exposed applications, 25-50 year corrosion life. Stainless 304: marine and coastal environments. Stainless 410 (hardenable stainless): better thread cutting in concrete than 304, but lower corrosion resistance than 316. Match corrosion grade to environment. For coastal mining and marine: stainless 304 minimum, 316 preferred.