Concrete Screws – Everything You Need to Know

Concrete Screw Rod Hangers from Armafix

What are concrete screws used for?

Simply put, self tapping screws will tap their own head which means they will need a small hole drilled ahead of a full-sized hole as a guide, otherwise known as a pilot hole. With that in place, you can drive the tapping screw into the material and the threads will dig in to keep the fixing secure.

These handy screws are favoured by contractors, electricians, and plumbers for many applications due to their durability, protection against rust, ease of installation and the secure holding they provide in all instances of installation.


How deep do you drill for concrete screws?

The average depth to drill your concrete screws is typically ¼ inch deeper than the length of your screw. You should not drill your pilot hole any deeper than ¾ inch to avoid shearing off the head of your screw. However, to ensure a secure fixing the screw should be driven in at a minimum of at least one inch deep.

It’s essential to make the pilot hole deeper than the length of your concrete screws to ensure that when the concrete screws are cutting threads there is room for any dust coming from the concrete or brick.


Are concrete screws removable?

Once concrete screws have been installed they can easily be removed again because they are threaded screws. During installation, they will tap threads into the concrete or brick and when you wish to remove them you simply need to turn the screw anti-clockwise for it to make its way out of the material.

It is important to note and consider that once you have removed concrete screws, if you were to re-insert it the holding values would be affected.


A Armafic concrete screw in concrete wall.


How do you use self-tapping concrete screws?

Fixing to materials like concrete used to be incredibly difficult and time-consuming but the introduction of self-tapping concrete screws has changed that altogether – it couldn’t be simpler.

Unlike self-drilling screws which do not need pilot holes due to their drill bit end, self-tapping screws like concrete screws do require the user to mark a spot for the pilot hole. Once that’s done it’s simply a case of attaching the right drill bit which depends on the size of your screw:

Bits are always smaller than screws because you will use these to drill the pilot hole, which needs to be smaller than the actual screw in order to allow the concrete screws to cut its own threads as it is driven in. Drill the pilot hole, clean it out and place the concrete screws within.

Match the head of the concrete screw to a drill bit and slowly drive it into the material in question, maintaining a steady pressure. Screws should not be placed close together as this will weaken the concrete, making it unreliable.


What are concrete screw rod hangers?

Concrete screws rod hangers are concrete screws that have been designed specifically for overhead rod applications. Just like other self-tapping screws, concrete screws rod hangers are ideal for concrete fixing and are approved by the European Technical Approval for cracked concrete and non-cracked concrete.

Here at Armafix, we offer the M10 Male Concrete Screw Rod Hanger and Female Concrete Screw Rod Hanger, both of which are suited to applications like fixings of pipe routes, channel systems, ventilation ducts and facilities in building service engineering. These self-tapping rod hangers offer a fast alternative to traditional drop-in anchors and are installed in less than half the time.

While some manufacturers supply rod hangers with a much longer threaded barrel, which can cause problems when hanging services from the ceiling, Armafix supply rod hangers with a short threaded barrel – this is much more effective.

As suppliers of a vast range of fixings and support solutions, we’re well equipped to meet the needs of the electrical and mechanical industries.

With a knowledgeable team that is willing to go the extra mile, simply get in touch with any questions you may have. We know that you’re busy and waiting for a response is not ideal, so we make it our aim to respond rapidly to help you achieve more in the day.



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This article was written by Terry Harmer, Managing Director at Armafix, who has several years of experience of supplying quality fixings and support solutions for the building services industry.

Armafix, Managing Director, fixings, screws, fasteners

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