Why are my Tapcons not grabbing?

The hole needs to be slightly smaller than the diameter of the fastener so that the threads of the Tapcon have something to grab into. If the masonry bit you use is too small you won't be able to drive the Tapcon in at all. If the masonry bit is too large, the Tapcon will not hold.

medium.com - Most Common Mistakes When Using Tapcons To Fasten To Concrete

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Most Common Mistakes When Using Tapcons To Fasten To Concrete

A Tapcon is a special fastener used in construction for fastening to concrete and masonry. While there are a lot of ways to fasten to concrete Tapcons are a great light-duty way to do so. They are accessible to most homeowners and DIY’ers because they are easy to use and only require having; a drill with a hammer setting, an impact driver and a masonry drill bit.

A Tapcon Concrete Fastener

Here are the most common mistakes to avoid:

Using The Wrong Drillbit Size for The Fastener

The hole needs to be slightly smaller than the diameter of the fastener so that the threads of the Tapcon have something to grab into. If the masonry bit you use is too small you won’t be able to drive the Tapcon in at all. If the masonry bit is too large, the Tapcon will not hold. You can find out which sized masonry bit to use by looking at the Tapcon packaging. Based on the diameter of the fastener you have, the masonry bit size will be indicated on the box. The Package will indicate the diameter of Masonry Bit you’ll need to use

Over Boring The Hole

This is similar to using the wrong diameter bit. When drilling out the hole for the Tapcon you will need to keep a steady hand. If you “wobble” the masonry bit side to side as you drill you’ll effectively make the hole wider and the fastener won’t have any concrete to grab onto. To avoid this drill your hole at a consistent angle and stay steady. Drill quickly and use a sharp masonry bit.

Over Driving The Fastener

You want to snug the fastener up so that it holds, however, you don’t want to over-tighten it. This can be fairly easy to do when you’re using an impact driver. Over tightening/driving can result in the threads of the Tapcon being worn down as they spin against the concrete, some of the concrete will also be ground away. The result is a fastener that won’t hold, just like over boring the whole with the masonry bit.

So remember, snug it up, but don’t over tighten.

When A Tapcon Won’t Go All The Way In

This is by far the most common problem people will face when using Tapcons. This can happen for a few reasons. Typically what happens is that as you drive the Tapcon in some of the residual concrete dust is left in the whole from drilling. This dust compacts at the bottom of the hole not allowing for the Tapcon to be driven in fully.

Here are some tips to avoid this:

Drill the hole deeper than you need (ie. Deeper than the length of the Tapcon fastener). That way any residual concrete dust will have a place to go. Clean out the hole before driving the Tapcon in. The best way to do this is with a vacuum and/or an air compressor. I’ve found that the needle attachments for blowing up sports balls (think basketballs, footballs, etc) are pretty effective for blowing concrete dust out of the holes. With that, may you avoid these common mistakes and may your Tapcons forever hold strong.

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