What Size of Drill Bit Do I Use For a 1/4 Tapcon?

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Tapcon screws are capable of anchoring in a variety of materials, including block, brick, and concrete. But if you don’t know what size drill bit to use for 1/4 Tapcon, you can end up damaging foundations that are not easy to repair. 

Thus, it is important that you match your Tapcon with the correct drill bit size, which we will show in this guide.

What Drill Bit Size Matches a ¼” Tapcon?

When drilling a 1/4″ Tapcon, a 3/16″ bit is needed.

Tapcon Size

Drill Bit Size



Tapcon length is critical since this determines whether or not the hole bored is 1/2 in., shallower than your Tapcon screw. Mistakes in sizing might result in damaged foundations and the inability to finish a job.

The 1/4″ Tapcon is available in four distinct sizes, each with its recommended drilling range. 


Diameter X Length

Drill Depth


3/16” x 3.5”



3/16” x 4-1/2”



3/16” x 5-1/2”



3/16” x 6-1/2”


How to Properly Use a ¼” Tapcon

You need to use a carbide tip that complies with ANSI Standard B212-15-1994 for brickwork. If you’re using Tapcon screws, you need to drill each of the holes in the base using carbide tips.

All hole sizes will be uniform if you use carbide tips brazed on one end and meet ANSI standards. Buying old or lesser-quality carbide tips will result in a material with a low melting point and a brazing process that fails to last. [1]

tapcon concrete anchors

Finding the Tapcon’s flat end is also important for screw placement. Instead of inserting the carbide tip onto the installation tools, you should use the flat end. When inserting it into the toolkit, ensure the flat end faces outward so you can adjust the set screw against it.

Other related pages: 

When Should a ¼” Tapcon Be Utilized?

You must use every Tapcon drill bit in hammer drills and switch it to a combination of rotation and hammer modes for optimal performance. Since a hammer drill has a higher cutting efficiency, the hammer’s rotary action can effectively clear out debris from the inside.

Other Factors to Take Note of When Using a ¼” Tapcon

There are alternatives to the hammer drill that must comply with ANSI Standard B212-15-1994. They must have the right diameter and length to guarantee accurate drilling.

A straight shank drill bit with a carbide tip is one alternative that you can use in a Jacobs-style chunk. You’ll need the chuck key, which you’ve probably used before, to use these. 

It’s common for these bits to have a flatter profile or a rounder shank so that you may insert them into a chuck. They are available in a wide range of sizes, in terms of width and length.

drill bit size chart

There’s also the spline drive system (SDS), which fits into the quick-disconnect chucks of a hammer drill. The SDS drill’s shank is the equivalent of a thumbnail in size, and it features two slots and groves.

Drilling is facilitated by the slots, which enable chuck movement and correct rotation, facilitating heavier pounding and a more rapid pace. You must take extra care to protect the slots and grooves at all costs.

Hex washer and Phillips countersunk head options are offered for the 1/4-inch diameter. Because the size of the Tapcon being installed is slightly less than the size of the hole drilled into the surface, a 3/16″ drill bit is used.

drilling hole in wall

The 620 shear pounds of holding power attained with a  minimum of 1-inch  embedment should be more than enough to support your load.

What to Do or Prepare Before Utilizing a ¼” Tapcon

Remove any dust from the hole caused by concrete before utilizing the Tapcon or drilling a wall or foundation’s surface. Some use brush wires to ensure that all dust has been removed.

Tapcon screws are commonly used for concrete, so before you begin fastening anything, double-check that you have the proper screws and have thoroughly cleaned the area. If you blow the dirt out of the hole, you can be confident that your creation will be robust and that the parts will fit together without any problems.

The nature of the working surface can also affect how challenging or simple an undertaking is. Drilling into well-cured concrete or concrete with inserted aggregate is more difficult.

Another Informative Read: Is it Okay to Use Drywall Anchors on Your Ceiling


What size is the head on a 1/4 Tapcon?

The size of the head on a 1/4 Tapcon is .180 inches in height. If you look at its hex head, you’ll see that the 1/4″ is 5/16″ long. For a 1/4″, the connected washer measures .415″ in diameter.

How strong is a 1/4-inch Tapcon?

A 1/4-inch Tapcon is as strong as 5/14 because a single 1/4-inch Tapcon buried 1-inch into a lightweight block can support 250 pounds in tension or 620 pounds in shear. Four heavy-duty Tapcons can also hold a 100-pound weight in mortar or brick.


Determining the size of drill bit to use for a 1/4 Tapcon is important because these screws come in various lengths that accommodate a wide range of material thicknesses. The Tapcon installation process is simple but requires the correct hole size, screw, and drill bit because these can make or break your project.

Robert Johnson is a woodworker who takes joy in sharing his passion for creating to the rest of the world. His brainchild, Sawinery, allowed him to do so as well as connect with other craftsmen. He has since built an enviable workshop for himself and an equally impressive online accomplishment: an extensive resource site serving old timers and novices alike.
Robert Johnson
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