Types of Concrete Screws

Concrete screws are a type of fastener that taps threads into a predrilled hole in concrete and other masonry base materials, such as brick, block or mortar joints.  There are many different types of concrete screws based on the manufacturer, the various materials from which they are made, and different diameters, lengths and head configurations.

Manufacture
Concrete masonry screws are manufactured in the United States under the brand name Tapcon®, and are sold by Concrete Fastening Systems, Inc.  The threads are designed with Advance Threadform Technology™ to allow for easier installation and less required torque for installation.  The Tapcon® is coated with a long life coating called Climaseal®, is Miami Dade County approved and has been tested by ICC-ES with report number ESR-1671.  Most other concrete masonry screw are manufactured and imported into the United States and do not meet the same specifications as the original Tapcon®.  The imported screws are less expensive and, as with most things in life, you get the value that you pay for.

Materials
Masonry or concrete screws are manufactured from steel.  The standard blue Climaseal® coated Tapcon® is made from low grade carbon steel.  The stainless steel Tapcon® is manufactured from a 410 stainless steel that is coated with silver Climaseal®.  The standard large diameter Tapcon® or LDT has an anchor body made from Grade 5 hardened carbon steel that is zinc plated.  The stainless steel LDT is made from a 410 stainless steel with no added coating. The unique feature for all of the Tapcon® is that the threads are hardened allowing them to cut into very abrasive masonry without hardening the anchor body.

Diameters
Both the standard blue and the stainless steel Tapcon® come in two diameters of 3/16” and 1/4”.  They require a predrilled hole in the masonry to be 5/32” and 3/16” respectively.  The Large Diameter Tapcon (LDT) carbon steel come in diameters of 3/8”, 1/2”, 5/8” and 3/4” with bit requirements of 5/16”, 3/8”, 1/2” and 5/8”.  The stainless steel LDT is available in diameters of 3/8” and 1/2”, requiring a 5/16” and a 3/8” bit.  The hole in the masonry must be drilled using a bit that meets ANSI standard B212.15-1994. 

Lengths

 

Diameter

Length

Diameter

Length

3/16”

1-1/4”

1/4”

1-1/4”

 

1-3/4”

 

1-3/4”

 

2-1/4”

 

2-1/4”

 

2-3/4

 

2-3/4

 

3-1/4

 

3-1/4

 

3-3/4

 

3-3/4

 

4

 

4

 

 

 

5

 

 

 

6

3/8” Standard

1-3/4”

3/8” Stainless

1-3/4”

 

2-1/2”

 

2-1/2”

 

3’

 

3’

 

4”

 

4”

 

5”

 

5”

1/2” Standard

3”

 

3”

 

4”

 

4”

 

5”

 

5”

 

6”

 

6”

5/8”

4”

 

5”

 

6”

3/4"

4-1/2”

 

5-1/2”

 

Head Configuration
The 3/16” and 1/4” Tapcon® come in a hex washer head and a flat countersunk phillips, the LDT is only available in a hex washer head and is serrated.





 

Please remember with all fastening jobs to keep safety in mind. Always follow safety instructions on all tools, and refer to manufacturer's installation instructions when available and always remember to wear safety goggles!

Article written by: Bob Carlisle, President Concrete Fastening Systems, Inc

Back to Section