If you're standing in the hardware section wondering what size tapcon for 3/16 bit holes you really need in order to grab, the answer is simple: you need the particular 1/4-inch diameter Tapcons . It feels a little counterintuitive in case you're utilized to wooden screws where the preliminary hole is generally very much closer to the screw's diameter, using concrete screws, the guidelines change a bit. You want that screw to end up being larger than the hole so individuals threads can really bite into the masonry.
I've seen lots of people make the error of purchasing 3/16-inch screws for a 3/16-inch bit, and these people end up disappointed when the mess just slides within and out just like a loose tooth. That's because, in the particular world of Tapcons, the bit size is always smaller than the screw alone. If you've currently got your 3/16-inch drill bit ready to go, ensure you're picking up the 1/4-inch screws, or you're going to possess a lengthy, very annoying afternoon.
Why the sizes don't match up
It's a fair query to ask the reason why they don't just make the bit and the mess the same size. The reason is all regarding how these nails work. Unlike a wedge anchor that will expands, a Tapcon is a "tapping" screw—hence the title. It literally cuts its own threads into the wall associated with the hole you simply drilled. For that will to happen, presently there has to become enough concrete material left for the particular threads to hold.
In the event that you used a 1/4-inch bit for a 1/4-inch mess, there wouldn't become any "meat" still left for the mess to grab on to. By using a 3/16-inch bit, you're creating a hole that is simply wide enough for the shaft associated with the screw to enter, while leaving enough concrete for the larger strings to carve their particular way in. It's this "interference fit" that gives the Tapcon its legendary keeping power.
The two standard Tapcon pairings
In order to keep things simple for future projects, it helps to remember that there are really only two major sizes of regular Tapcons that many property owners and DIYers offer with.
- The 1/4-inch Tapcon: This requires a 3/16-inch masonry bit .
- The 3/16-inch Tapcon: This needs a 5/32-inch masonry bit .
Usually, when you buy a pack of Tapcons—especially the smaller packs—they range from the correct bit right in the particular box. When you're buying in mass or you've lost the initial bit, simply remember the "one size down" principle isn't quite correct because of the fractions. Just stick to the 3/16 bit for 1/4 screw rule plus you'll be golden.
Getting the depth right
Knowing what size tapcon for 3/16 bit drills is only half the battle. The level of the hole is usually actually just as important since the diameter. If you don't drill deep enough, the screw will bottom away before it's flush, and if you try to force it, you'll likely snap the head right away from. There's nothing quite as soul-crushing since a snapped screw stuck deep within concrete.
An excellent rule of thumb is to drill the hole a minimum of 1/2 inch deeper than the particular screw will really go. This extra space gives the concrete dust a place to negotiate so it doesn't obtain packed into the particular bottom and prevent your screw from seating properly. If you're using a 2-inch screw and it's going through 1/2 inch of wooden into the concrete, you've got 1. five inches of mess in the masonry. You'll wish to drill your own hole at minimum 2 inches deep.
Don't neglect to clean the hole
Even if you drill deeper than necessary, it's always a smart shift to clear the particular dust out of the gap before you drive the screw within. You can make use of a can associated with compressed air, the shop vac, or perhaps a simple hand push. I've even noticed guys just hit into the opening having a straw, although I wouldn't recommend that until you like wearing an encounter full of concrete dust.
In case you leave a bunch of dirt in there, the particular threads of the Tapcon need to battle through it. This particular creates extra friction and heat, which makes the mess harder to drive and increases the particular chances of this snapping or the threads stripping away. A clean opening makes for the much smoother set up.
Hex head vs. flat mind
When you're picking out your own 1/4-inch Tapcons to go with that 3/16 bit, you'll see two main designs: hex head plus flat head (Phillips or Star drive).
Hex heads are usually much easier to drive. You can use a nut driver or the socket, and you don't have to worry about the bit slipping out of the mess head. If the look of the hex head doesn't trouble you, or if you're fastening some thing like a 2x4 where the mind will be exposed anyhow, choose the hex.
Smooth heads (countersunk) are what you would like if you need the mess to sit flush with the surface. They are common for hanging things upon walls or installing door frames. Just be careful along with these; it's much easier to strip the head of a Phillips Tapcon than the usual hex mind. If you possibly can find the Star drive (Torx) version, grab those—they handle the rpm much better.
Use the best drill
I actually can't stress this enough: use the sludge hammer drill . While you can technically drill directly into concrete with the regular old power drill, it's going to take permanently, and you'll most likely burn through your 3/16-inch bit before you complete the second opening.
A hammer drill doesn't just spin; this also hammers the bit into the material because it turns, pulverizing the concrete. It's the between trying to push the toothpick by way of a stone and using the jackhammer. If you've got more than a handful of holes to do, go lease or purchase a good hammer drill. Your wrists as well as your tolerance will thank a person.
What if the screw simply spins?
We've all been presently there. You drill the hole, you start generating the 1/4-inch mess, and suddenly it just spins within place without tensing. This usually happens because the concrete is really a bit soft or maybe the hole ended up slightly too huge (maybe the punch wobbled).
One old-school technique is to have a small piece of copper wire or even even a couple of toothpicks and jam all of them into the gap before driving the screw back within. This gives the strings something extra in order to bite into. It's not "officially" recommended by the manufacturers, but in a crunch, it can help you save from having in order to redrill a fresh hole somewhere else.
The importance associated with the proper bit brand
Not most 3/16-inch masonry parts are created similar. If you may, try to use the bits specifically created by Tapcon or a high-quality brand like Bosch or Wisconsin. Cheap bits have a tendency to lose their particular tip diameter quickly. If the bit wears down, the hole becomes somewhat smaller than 3/16, and driving that 1/4-inch screw will become nearly impossible. You'll find yourself leaning upon the drill with all your weight, and that's generally once the screw photos.
If you notice the particular drilling process will be slowing down or even the bit is usually getting glowing crimson, it's time in order to swap it away. A fresh bit is a lot cheaper than the headache of dealing with a broken securer.
Final thoughts on the 3/16 and 1/4 combo
At the finish of the time, just keep that will 1/4-inch screw in order to 3/16-inch bit percentage in your mind. It's the gold standard for most medium-duty masonry function. Whether you're increasing a TV group to a basement wall structure, securing a bottom part plate for the new wall, or even just hanging some shelving in the garage, getting the particular sizing right will be the biggest challenge.
Once you've got the correct what size tapcon for 3/16 bit question responded, the remaining is just about technique. Drill deep, clean the gap, and drive it steady. Concrete may be intimidating to work with in case you haven't performed it much, yet once you see how well a correctly sized Tapcon retains, you'll be looking for excuses in order to bolt items to your foundation. Keep in mind: 1/4-inch screw, 3/16-inch bit. Get that perfect, and the rest is easy.