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CONFAST Concrete Screws, Uses & Important Concrete Screws, Uses & Important Information
By: Confast Concrete Fasteners
Applications for Concrete Screws
Concrete screws are very versatile and are ideal for use in both light and medium duty fastening applications. These screws come in a variety of sizes and styles that are easily installed. After installation, concrete screws can be removed without disturbing the base material. These screws are useful because they can be installed close to edges, unlike other types of fasteners. The different lengths can be used when the fastening material has a thickness of up to 5". This wide range of lengths allows the screws to be used to fasten studs, plywood, electrical boxes, exterior insulation systems and many other applications.
Concrete Screw Threads
The industry term for the threads of concrete screws is "High-Low". The design of "High-Low" threads assists with dust removal during installation. This type of thread also permits the screw to tap threads consistently and delivers high-quality performance. When the threads are cut into the base material it is important that the dust must be removed as quickly as it is created. This ensures smooth and consistent installation, with less torque required to insert the screw into the base material.
If the dust is removed slower than it is created, several problems can occur. The screw can bind up in the hole, preventing further insertion and/or prohibiting the removal of the screw. Also, if the screw binds in the hole and too much torque is applied, the head of the screw can shear off. Since the lead thread is doing all the cutting of the base material, the quality of the steel and thread forming is extremely important when using these screws.
As with all concrete anchors, the hole tolerance for a concrete screw is critical. Always use a hammer drill and a matched tolerance carbide tipped masonry bit when installing concrete screws.
The hole should always be drilled at least 1/4" deeper than the required embedment. This will guarantee that the screw does not bottom out before it reaches the desired depth of embedment. If the screw bottoms out because the hole is not deep enough; it will stop, bind up and most likely shear off at the head.
Masonry bits come in different lengths to accommodate the different lengths of screws that are available. These bits are typically available in 3-1/2", 4-1/2", and 5-1/2" lengths.
Concrete screws require a minimum embedment of no less than 1" and a maximum embedment of 1-3/4" into the base material. An embedment of less than 1" should not be used because this will diminish the holding values of the screw.
True holding values are not known in this situation.
Trying to embed the screw deeper than 1-3/4" could cause a variety of problems including:
Determining the Length of Concrete Screw to Use
Each application may require a different concrete screw length. To determine the length of screw required, follow the instructions below:
Keep in mind that all concrete screws are measured from under the head. For example, when fastening a 2x4 to concrete, the 2x4 is 1-1/2" thick. Take 1-1/2" plus a minimum of 1" and a maximum of 1-3/4" embedment. This provides a total of 2-1/2" to 3-1/4" for the screw length. Concrete screws are available in lengths of 2-3/4" and 3-1/4". In this case, the 2-3/4" screw would be the proper choice, as the embedment would be 1-1/4".
Installation of Concrete Screws
The installation of a concrete screw is quite simple. Installation can be completed in three steps:
1. Using a hammer drill and a correctly sized carbide tipped masonry bit, drill a pilot hole 1/4" deeper than the recommended embedment.
2. Clear the hole of all debris.
3. Using a standard drill with the appropriate hex or Phillips socket, drive the concrete screw into the pre-drilled hole until the screw is fully seated.
** Be careful not to over-tighten the screw, this may cause the screw to spin in the hole stripping the threads.
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