DIY Builds
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Do I need to pre drill for concrete anchors?

Do I need to drill a pilot hole for concrete screws? It is necessary to make a pilot hole for concrete screws. You should allow for a little extra depth to your drill hole to ensure that when the concrete screws are cutting threads there is enough room for any dust that might accumulate.

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To put screws in concrete you need special screws, a drill and the right technique. Concrete screws are the only kind of screws that are strong enough to penetrate concrete. They come in different lengths, and it's important to have several sizes on hand. Concrete is a dense material, so you'll need a screw that can penetrate 1 inch (2.5 centimeters) into the concrete; then add an additional inch (2.5 centimeters) more than the thickness of the material you are attaching to the concrete, so that the screw is embedded strongly enough. Knowing how to drill the hole is important when you use concrete screws. You have to allow for a little extra depth to your drill hole, because dust accumulates inside. A hammer drill is good for this purpose because you can adjust the depth of the hole so it won't be too shallow or too deep. There are two kinds of screw heads for work with concrete -- hex head or flat head Phillips. Hex screws are easier to drive in, but they don't look as nice because the caps are raised and they can't be flush to the surface; so your choice depends on the location of the screw. Align the screw and then use constant low-to-medium pressure on the drill when driving in the screw. Never drive the screw in at high speed, which can damage the threads and cause the screw head to break. Sometimes you can run into problems when putting screws in concrete. If you're having trouble driving the screw in, the hole might not be deep enough or there might be too much dirt inside. If the screw spins with no grip and doesn't tighten, you may have to put a plastic anchor in the hole and drive the screw directly into the anchor.

Originally Published: May 17, 2011

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What is the best way to anchor into concrete?

Concrete screws provide a quick, easy and incredibly strong way to fasten to concrete. And best of all, there's no hammering required or anchor or shield to install. All you do is drill a hole and drive in the screw. That's it.

There are many home-improvement projects that require you to screw or nail into concrete, such as when affixing shelf brackets to a concrete basement wall, screwing down a 2x4 sole plate to a concrete floor, fastening metal conduit to concrete surfaces, or securing steel post anchors to a concrete patio. Unfortunately for many DIYers, using concrete screws or fasterners can be a frustratingly difficult and almost impossible task. But when armed with the correct tools and a few specialized fasteners, anyone can learn to fasten almost anything to concrete.

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Here, we’ll explain four different techniques and types of concrete screws and fasteners specifically designed for attaching to concrete, and most can also be used to fasten into brick, stone, and concrete block as well. Note that before installing most concrete fasteners, you must first drill a hole with a carbide-tipped masonry bit. The quickest, easiest way to drill into concrete is with a hammer drill, which uses both bit rotation and concussive blows to bore the holes. If you don’t own a hammer drill you can use a standard corded electric drill or cordless battery-powered drill, but it’ll take at least twice as long to drill each hole. It’s also important to always blow or vacuum out the concrete dust from the hole before inserting the fastener. That’s because concrete fasteners grip much more securely in clean, dust-free holes.

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