What Is A Concrete Screw?

What is a Concrete Screw? – A Complete Guide for Installers and Buyers

Concrete screws, also known as self-tapping concrete screws or concrete anchor bolts, are a type of fastener specifically designed for direct fastening into concrete, brick, and masonry surfaces. Unlike expansion anchors or chemical anchors, concrete screws provide strong, reliable, and removable anchoring without the need for plugs or sleeves.

Whether you are a DIY enthusiast, professional contractor, or procurement officer in need of industrial concrete fastening solutions, understanding how concrete screws work — and how to choose the right one — is essential.

How Do Concrete Screws Work?

Concrete screws feature a high-strength thread design that allows them to cut into the base material (usually concrete) as they are driven in. This creates a secure mechanical connection without the expansion force used in other systems like wedge anchors.

They are also commonly referred to as:

• Screws for concrete

• Concrete self-tapping screws

• Heavy-duty concrete fasteners

How to Install a Concrete Screw?

Installing a concrete screw is simple and efficient when using the right tools and methods:

1. Drill a pilot hole using a hammer drill.
   For example, an M6 concrete screw typically requires a 5mm drill bit, while an M8 concrete screw might need a 6.5mm drill bit.

2. Clean out the dust inside the hole.

3. Drive the screw directly using an impact driver or wrench.

4. Verify proper embedment depth – for M6/M8/M10 concrete screws, the depth is usually 30–70mm depending on the load.

No plug or expansion sleeve is needed — making this method faster and easier.

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Sizes and Types of Concrete Screws

Concrete screws come in different diameters (6mm, 8mm, 10mm, etc.) and lengths (50mm, 80mm, 100mm, etc.), and they can be finished with:

• Zinc plating (galvanized)

• Blue zinc (for indoor use)

• Stainless steel (304/316) for outdoor use

Some common head styles include hex head, flat head, and countersunk head, suitable for different applications like:

• TV mount installation

• AC bracket fixing

• Pipe clamp fastening

• Wood to concrete anchoring

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Performance & Load Capacity

One of the most common questions is:

How much weight can a concrete screw hold?

The load capacity depends on:

• Screw size and length

• Embedment depth

• Concrete quality (e.g. C20 vs C30)

For example, an M8 x 80mm concrete screw can typically hold up to 300–500 kg in good concrete under tensile load.

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Can Concrete Screws Be Reused?

Generally, concrete screws can be removed and reused once or twice, especially in temporary installations. However, reusing them may slightly reduce holding power, and ETA certified concrete screws may specify limitations on reuse.

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Concrete Screws vs Expansion Bolts – What’s Better?

For clean, efficient, and non-destructive fastening, concrete screws are the ideal alternative to expansion bolts, especially in modern construction projects.

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Where to Buy Concrete Screws?

Looking for high-quality stainless steel concrete screws or galvanized concrete anchor bolts? Many manufacturers offer them in bulk. Make sure to choose products with:

• ISO/CE/ETA certification

• Suitable load testing data

• Compatible drill & installation guidance

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Final Thoughts

Concrete screws are becoming the go-to choice for construction, renovation, and industrial applications due to their ease of use, high load capacity, and clean installation. Whether you're mounting a TV bracket, securing pipework, or building frameworks, the right concrete screw ensures safe and professional results.