CONFAST 3/16" x 2-3/4" Hex Head Concrete Screw Anchor with Drill Bit for Anchoring to Masonry, Block or Brick (100 per Box)

I used this to repair a corner pop on my foundation. The original material was lost so I had to form a new one. I used this anchor screw to provide support for the new corner. I drilled into the old concrete, added in an epoxy for anchors, placed the screws tightly, let it dry, setup a form, then troweled in the new concrete. Repair looks good (professional even), and seems very stable (time will tell). To determine the correct size, you need to decide how deep the screw will be set. I wanted mine sticking out by 1.5 inch to act as rebar for the concrete, and drilled about 1.25 inches deep into the existing foundation, so I used 2.75 inch long screws. If anchoring other material, then consider it's width plus the depth you want the screw to be drilled. Be sure to use an anchor epoxy for a permanent fix. A note about drilling the holes for these screws: There are a LOT of drill bits advertised as good for concrete, they aren't. You need a fairly long bit (longer than the length of the screw to be set in the concrete) and it needs to be a REAL CONCRETE DRILL BIT - like the "Bosch BM5000 Fast Spiral Masonry Set". You must use the correct bit width or you can damage the concrete (if too narrow a bit) or the screw won't hold (if too wide a bit). Length is really difficult to get right if you are working in a confined area, so take that into account. If you have a wide open work area then you need to determine how deep you want to set the screw and be sure you have a slightly longer bit - put a piece of tape on it to show how far in to drill and when the tape aligns with the concrete you stop. If you have a really confined area like I did, you need to also determine how much extra bit you need to fit into the area to even reach the drill drill point (I could get the drill about 2 to 3 inches away from the drill hole and no closer). This means you have to add that much to the overall length of the bit for your project to work. Finding long enough masonry drill bits can be a real problem.

First off, if you are trying to drill into concrete or brick you need a masonry drill bit and a hammer drill. Otherwise, you will spend long hours trying to drill a short hole. I had been drilling holes for plastic wall anchors into concrete but they could pull out fairly easily. So, I decided to try these screws that directly screw into the concrete. They even come with their own masonry drill bit. Let's just say that I will be using these from now on. I needed to mount a steel wall rack for storage bins onto a concrete wall. To be honest, I was kind of dreading this project because it was going to take a chunk of my Saturday. The drill went through the concrete like butter and the screws screwed tightly into the wall. The whole mounting project probably took 5 minutes.

I don’t know how any screw bites into concrete, but these do it. The key seems to be pre-drilling with a bit one size smaller than the screw’s diameter. With a 1/4 inch concrete screw that would be a 3/16 inch concrete drill bit, and so on.

The screws did the job... Good value for the quantity. The drill bit was not good though. It was not straight. I ended up using my old 3/16 bit which is shorter than the one provided with the screws but thankfully was the right length.

We use about 50 a week and maybe I've broken the head off of 3 of them in the past 4 months. Honestly, that's most likely only because my guy was using too much tork with my impact driver. Going full throttle while the thing is already set. Yea, they might break then. If you know how to use a drill. You shouldn't have an issue. These are good screws. Much better than buying 15 for the same damn price at my local hardware store.

Good brand works well

Overall these are a good value in 1/4" concrete screws and work fairly well even though I damaged a couple of them when installing them but plenty more in the box. The supplied drill though dulls fairly quickly but I had some Irwin bits that allowed me to finish the job.

These are very good quality and the enclosed drill bit work great. Very easy solution and I liked the hex head on the screw better than a traditional slot head. Very nice to have either option in one screw.

They did what the were designed to do, and well. But honestly, the cost of fasteners now, and these were the least costly of the bunch.

These screws are heavy and high quality. The hex head makes it easy to drive, and a 3/16" masonry bit was the perfect pilot. However, I want to take 1 star off because unlike the description, these screws did NOT include a drill bit.

avevo già utilizzato negli stati uniti con risultati buoni,ottimo se si usa con tasselatori vibranti e non impulsi ,ottimo per fissare profili pezzi che richiedono viti continue senza segnare togliere e forare

En las especificaciones RECOMIENDAN utilizar broca de 3/16" sin embargo a mí no me funcionó así, quedaban bailando con tornillos, tal vez por el tipo de material, lo mismo ocurrió con los TAPCON, ambos incluyen sus brocas pero no logré el efecto deseado por lo que decidí ir por una broca más pequeña. En este caso ocupé una broca SDS de 5/32" y el efecto logró ser el esperado, algunos tornillos siguen girando al llegar a tope (por extracción saldría con mucha facilidad) con esta combinación de broca y tornillo quedó muy sólido.

Had no trouble with the screws however the included bit was too short.