1/4 in. x 3-1/4 in. Hex-Washer-Head Concrete Anchors (8-Pack)

The Tap-cons work great, but the drill bits they have just don’t work good, use a rotohammer with appropriate size bit, it will save you a lot of time if you have a-lot to install

Fits perfect and firm on the concrete I now have 8 screws for a 4 bike rack.

2-3 of my hard we earned holes drilled the screws broke off in while drilling.

The first 2 screws from this pack snapped right where it becomes smooth as screwing them in. Even bought the Tapcon bit specified for these screws to make sure, made no difference. Really bad quality.

Highly recommended!!

Great for concrete slabs

I needed to anchor window wells to the concrete foundation of my house. Since these are austensibly the anchors for the job I bought them. The included drill bit dulled after 3 holes which I was prepared for and didn't surprise me. The screws were awful. 2 out of every three broke off in the hole and is now, unfortunately, a permanent fixture. The heads of about 1/4 of the rest I used rounded off quickly and had to be discarded. I would not recommend these but unfortunately they have become pretty ubiquitous.

This is what you need to sink into concrete if you live in an ICF (Insulated Concrete Form) built home. The concrete is sandwiched between 2 1/2" of dense foam insulation inside and out. after penetrating the foam you're left with 1 1/2" of bite and you have to consider the thickness of the material you are trying to attach with the Tapcon. It is reported that a 1/4" screw with a 1" bit, has a sheer strength of 900lbs. When using first blow out your hole after drilling to assure a secure bite.

Used their masonry bit, made sure I drilled the hole deeper than the anchor, installed these with an impact driver and couldn't be happier. Had a storm a few days later and the patio cover didn't budge. 16 of them in with no breakage.

If you need concrete anchors and don't want to bother with the lead anchors with a good steel bolt these are as good as anything else. But the heads have a little taper to them and strip and round off really easy in a socket or end wrench. They don't have a good head on them where the wrench can get a good grip for the length of the head like a steel lag screw. Then you have no choice but to back it out, throw that one away and use a new one. I used about 1/2 of the box to get 16 anchor points in 2 4x4 post bases. But the 75 anchor box is cheap enough that you can afford to do that and I knew what to expect from past experience. They are convenient.