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Expansion anchors are a type of fastener, primarily used in concrete or masonry substrates that fasten objects down to the substrate by way of an expansion point gripping firmly against the substrate.
There's two primary types of expansion anchor:
Expansion anchors aren't generally spoken about in this way but its important to understand the difference.
Essentially we have two different types that sort of produce the same outcome but the way of expansion is slightly different.
Lets take a look at both of these:
Ok so what are 'expanded expansion anchors'?
This is what an expanded expansion anchor sort of looks like:
As you can see the very tip of the anchor is already expanded. So when we install this into a hole that is smaller than the expanded part of the anchor.
Because of the sprung steel the anchor is permanently pushing against the outer wall of the masonry hole and that's what gives it its grip!
Expanded expansion anchors are very common for applications whereby speed is a large factor.
Due to the action of the anchor no tightening is usually necessary and this speeds up install times considerably. These are mostly used in our experience in applications like laying plywood flooring down over concrete slabs etc.
As they aren't removeable its always best to double check before you install an expanded anchor!
These are by far the most common types of anchors and will include lots of styles you've seen before.
So a non-expanded expansion anchor is any type of expansion anchor that isn't already expanded. Any anchor that you have to tighten up will generally be a non-expanded expansion anchor.
Again these types of anchors work by way of expansion, the action is just slightly different. You will usually install into a pre-drilled hole (usually the same size as the anchor) you will then usually tighten these anchors up and as you tighten them up an expansion point on the anchor will start to expand.
As this happens it is becoming tighter and tighter against the solid substrate.
Lets see a few types of expansion anchors that you're probably familiar with (we're not going to go over al of them as there is 100s!):
Through bolts work by way of expansion on the end fork. As you tighten up the nut on top the cone piece will slowly pull through the clasp and start to expand.
Through bolts are a very heavy duty fixing as they are usually manufactured from solid high tensile steel and the expansion claps will generally fully deform in the hole.
This leaves very little parts of the anchor that can possible fail.
Sleeve anchors are very similar to a through bolt in a sense of how the expansion is formed.
The main differences are though that that sleeve anchor is formed from a centre bolt and then a full length sleeve.
As the expansion cone pulls through the sleeve it expands the sleeve against the masonry.
They aren't quite as high load rated or well thought of as through bolts as they have a couple of downsides:
They are a 1 piece body with a expansion cone, the beauty of drop in anchors is they do not come with bolts so you can use any length bolt you like.
The expansion action works in 2 ways and is the opposite of the other 2 listed above.
The expansion cone piece is actually pushed away from the bolt in order for the expansion to take place
See below:
The small expansion cone lies about half way down the anchor as standard.
Once you place the drop in anchor into the pre-drilled hole, you strike the expansion cone within the anchor with the tool above.
This forces the 4 prongs to expand and grip against the substrate. you can then install a bolt through the object you'd like to fasten and into the anchor
These are similar in a sense to drop in anchors in that you have to strike them to install
They work by having a nylon or steel body that you place into the hole
You then strike a nail or screw through the centre of the anchor and this forces the body to expand against the substrate
These are very very popular in nylon bodies as they are exceptionally economical but you can realistically get multiple different types for all sorts of applications
See below:
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There's plenty more expansion anchors out there but hopefully by the end of the article you get the jist of it
If the anchor expands in the hole, its an expansion anchor.
If you need more information on certain types of expansion anchors you can check out our full range of anchors and fasteners here: Fasteners
Thanks for reading our latest blog entry
Best Regards,
The Scrooz Fasteners Team
www.scrooz.com.au
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Are you looking for the perfect fastener for your project? Let's explore why Screwbolts should be your top choice.
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1. Easy Install, Removal, and Reuse:
Installing Screwbolts is a breeze, and their full threading allows for effortless removal and reuse. Sleeve anchors, on the other hand, are a one-time deal, requiring grinding for removal and leaving an eyesore behind.
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2. Strength, Stress, and Safety:
Screwbolts, as screw anchors, exert minimal stress on substrates, making them ideal for close-to-edge applications. Expansion anchors, by contrast, rely on friction in pre-drilled holes and can risk cracking when near edges. Screwbolts distribute load over a larger area, ensuring superior strength.
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3. High Strength vs. Mild Steel:
Screwbolts are crafted from high-strength carbon steel, perfect for structural needs. Their threaded design offers higher load capacity than equivalent-diameter expansion anchors. Sleeve anchors typically use lower-grade steel (5
, limiting their structural applications.
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4. Head Marking for Identification:
Screwbolts feature dimensions stamped on their heads, making post-install identification a breeze. Sleeve anchors, especially hex head variants, lack this feature, making it challenging to determine their depth after installation.
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5. Aesthetic Head Finish:
Choose from various Screwbolt head profiles like Hex, Pan, and Countersunk for a sleek, aesthetically pleasing finish. Sleeve anchors, with their "thread through nut" design, leave an unattractive head finish.
Make the smart choice for your projects&#;opt for Screwbolts!
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