How to Use and Install Drywall Anchors: Tips from the Pros
So you’ve got some items to hang, but you don’t want them eventually falling off of your wall and shattering into a million pieces? Some type of drywall anchor will likely be your best friend. Commonly, you’ve got your plastic sleeve anchors, your self-drilling threaded anchors, molly bolts, and toggle bolt anchors. All of them accomplish the same general task by expanding and biting into or gripping the drywall. If you’re wondering how to use or install drywall anchors, we’ve got the basics covered for you.
Table of contents
- Which Drywall Anchor Should I Choose?
- How to Use a Drywall Anchor
- Installing A Plastic Sleeve Anchor
- Installing a Self-Drilling Threaded Anchor
- Anchoring With Molly Bolts
- Installing a Toggle Bolt Drywall Anchor
- Installing Snaptoggles
- What if the Drywall Anchor Hole is Too Big?
- What Size Pilot Hole is Best for Drywall Anchors?
- How Deep to Drill Pilot Holes for Drywall Anchors
- Random Fun Drywall Anchoring Facts
Which Drywall Anchor Should I Choose?
Generally, your drywall anchor selection will revolve around the weight of the item you wish to hang. While there are actually many types of drywall anchors available, some are more common than others. For the sake of brevity, we’ll stick with some of the more common types.
- Less than 10 lbs: plastic sleeve anchor
- 10 to 25 lbs: self-drilling threaded drywall anchors
- 25 to 50 lbs: Snaptoggle, molly bolts, or traditional toggle bolts
- Over 50 lbs: Snaptoggle, toggle bolts, or screw into an actual stud
There are some drywall anchors rated for 100 pounds or more. Use these with discretion and test them prior to hanging expensive items from them.
How to Use a Drywall Anchor
Installing A Plastic Sleeve Anchor
- With a pencil, mark the point where you want to hang whatever it is you’re trying to hang.
- Drill/make a pilot hole. You can use any variety of tools to accomplish this, though you need to make the pilot hole smaller than the width of the anchor. If a pilot bit doesn’t come with the set, the packaging will tell you which size to use.
- Stick the anchor in the pilot hole and tap it into place until the head of the anchor flushes up with the wall. A rubber mallet is best, but a small finish nailer will also work.
- Use a screwdriver to set the screw. You can use a drill, but go slow so you don’t overdrive it.
Installing a Self-Drilling Threaded Anchor
- Mark your hanging point.
- With a rubber mallet or hammer, lightly tap the anchor into the wall until you get to the threads.
- Use a screwdriver to screw the anchor into the wall until the head of the anchor is flush with the drywall. Again, if you opt to use a drill go slow and be careful.
- Set the screw to the depth you want with the same screwdriver or drill.
Anchoring With Molly Bolts
You’ve generally got two choices when it comes to molly bolts, or “hollow wall anchors”: pointed and un-pointed. The dull-tipped un-pointed anchors require you to drill a pilot hole into the drywall. Pointed tip styles don’t need a pilot hole; you can just tap these into place with a hammer. You might also find molly bolts with barbed heads. These barbs grip the surface of the drywall and keep the anchor from spinning in its hole.
- Mark the point where you’d like to hang stuff.
- If a pilot hole is needed, drill one. Check the package to find out the size you’ll need for the pilot hole.
- After insertion, tighten the bolt in the sleeve of the molly. This will cause the legs to expand out and grip the other side of the drywall.
- Once you tighten down the molly bolt, back the screw out of the sleeve and hang directly from the head of the screw.
Installing a Toggle Bolt Drywall Anchor
When you’ve got heavier items to hang, but can’t find a wall stud to hang it on, toggle bolt anchors can save the day. Of course, there are a few things to be aware of before getting started. For one thing, you’ll have to drill a hole that allows for the toggles to pass through. This will require a hole that exceeds the width of the screw head, so toggle bolts can really only be used in conjunction with a bracket that will cover the hole. Also, while these drywall anchors can support a fair amount of weight, your softish drywall will fail if you put too much weight on it.
- Mark your hanging point.
- Drill a hole big enough to allow for the toggle bolt to slip through when in its folded position. The manufacturer instructions on the side of the box of toggle bolts should give you the necessary specs for drill bit widths.
- Put the bolt through the bracket you’ll be attaching to the wall. Then, thread the toggle onto the bolt with the tips facing the screw head.
- Squeeze the toggle closed and jam both the toggle and bolt through the wall. When the toggle clears the backside of the drywall, it will open up and grip the wall.
- Tighten the bolt until it’s snug.
Even better than Molly bolts or toggle bolts, we love Snaptoggles. The reason is simple—you can remove the bolt and reinsert it as needed. This presents a huge advantage over traditional toggle bolts. They also install easier than Molly bolts in our opinion, though they have a couple of steps:
- Drill the correctly-sized hole.
- Slide the Snaptoggle’s metal channel through the hole.
- Hold ends of straps together and pull with one hand until the metal channel rests behind the wall.
- Ratchet the cap along the straps with your other hand until the flange of the cap is flush with the wall.
- With your thumb between the straps at the wall, push your thumb side to side, snapping off the straps level with the flange of the cap.
- Voila—place your item, insert the machined bolt, and tighten until snug.
What if the Drywall Anchor Hole is Too Big?
Sometimes you accidentally overdrill the drywall anchor hole. When this happens, you have several options:
- Pick up a larger drywall anchor
- Proceed with a washer if using a standard toggle bolt
- If using a threaded anchor, and the bolt or screw seems too small, grab a larger one and see if you can get a secure fit
Of course, you can avoid most of these problems by ensuring you follow the directions for recommended bits. We also recommend drilling as straight as possible and not “reaming out” the hole when you drill. This keeps everything at the intended size. If you drill too large a hole, you risk allowing the drywall anchor to spin when you insert the screw.
What Size Pilot Hole is Best for Drywall Anchors?
The great thing about drywall anchors is they pretty much tell you exactly what size hole to drill. For our recommended Snaptoggle and FlipToggle anchors, a 1/2-inch drill bit is needed. For self-tap drywall anchors, you can forgo the drill bit altogether.
Pay attention to the back of the packaging, and pick up the best drill bit at the store when you get the drywall anchors.
How Deep to Drill Pilot Holes for Drywall Anchors
When dealing with any kind of drywall anchor that requires pre-drilling, you really only need to worry about a couple of things. First, are you near a stud or simply drilling into a drywall cavity? Second, are you drilling into an exterior block wall or is there some other potential obstruction?
Typically, you only need to get through the drywall—which lends itself to a very simple and quick process. If, however, you have to deal with a stud, you may want to opt for an anchor that can also dig into the wood as needed. You want to make sure your hole depth matches the drywall anchor with at least an extra 1/8-inch to account for any protrusion of the screw out the back.
When dealing with exterior block walls, we recommend trying to pick up at least one side with a furring strip. We’ve found that 3-inch long Tapcon screws provide excellent hold for block walls, provided you follow the instructions and install them correctly.
Random Fun Drywall Anchoring Facts
- Your drywall will fail before the vast majority of drywall anchors will. The point here is that you probably shouldn’t use drywall anchors to mount your new 65″ UHD TV to the wall. You’ll want to find the wall studs for that project, or you will eventually face a very sad day.
- Drywall anchors come in a variety of lengths. It will benefit you to know how thick your drywall actually is so that you can plan accordingly.
- Drill bit measuring guides exist. If you don’t know the size of your anchor, you can use a drill bit measuring guide to match up sizes. You’ll want your pilot hole to be just a bit smaller than the anchor you plan to throw in it.
- Want to anchor into both drywall and studs, but don’t want to buy a whole separate box of anchors? Drywall and stud anchors exist, and they’re awesome. Also, inadvertently running into a stud with these won’t ruin the anchor.
- Many other varieties of drywall anchor exist, and some of them are better versions of the ones listed here. Take these Driller Toggle Anchors from Cobra, for an example. They work similarly to the toggle bolts we talked about but don’t require a pilot hole. The point is, explore the drywall anchor section of your hardware store. You’ll likely find some more streamlined approaches to some of the classic designs.
If you have any tips, tricks, questions about how to use a drywall anchor, feel free to leave it in the comments section below.
How to Use Drywall Anchors
So, you want to hang something heavier than an average photo frame from your drywall: Whether you’re putting in a screw to support a rack laden with damp bath towels, a paper towel holder that gets regular use, or even a heavy mirror, you’ll certainly want it to stay there and not suddenly tear through the drywall under the weight of whatever it supports.
RELATED: The Dos and Don’ts of Repairing Drywall
Unfortunately, that’s the way the drywall crumbles—if it doesn’t have proper reinforcement. The good news is that there are a few options for securing a rack (or what have you) to the wall, and one of the most popular ways involves the drywall anchor. These pre-screw installments are designed to grip the brittle drywall and help hold your fastener in place. Follow this guide for how to use drywall anchor screws properly in your next project, and you can rest easy knowing that your hard work will hold up.
Tools & Materials
- Stud finder
- Drywall anchors and screws
- Cordless drill (optional)
Working Time: 5-10 minutes
Total Time: 5-10 minutes
Skill Level: Beginner
Estimated Cost: $10-15
Before You Begin
Before attempting to install a drywall anchor, first determine if you even need to use one. Drywall anchors are designed to add strength to hollow drywall. If you’re lucky enough to find a wall stud where you’re planning to drive in a screw for that framed painting or bathroom shelf, an anchor isn’t necessary. A single fastener driven into a stud can hold 100 pounds or more, depending on the size of the screw or lag bolt you’re using. Use a stud finder or some other method to find the wall studs behind the drywall before you begin.
STEP 1: Select the right type of drywall anchor for your project.
There are different types of drywall anchors, so make sure that your drywall anchor is rated for the amount of weight you’ll be putting on this fixture, and appropriate for wherever it’s installed (some are meant for walls, for example, and others for the ceiling).
In these instructions for how to use drywall anchors, we’re working with a threaded or self-drilling drywall anchor that holds up to 50 pounds and can be installed without a drill. These drywall anchors for heavy items go into walls without any pre-drilling and come in strengths ranging from 25 to 75 pounds, which is enough for most light-duty to moderate-duty projects.
Other than threaded anchors, the most common type of drywall anchor is the expansion anchor. Like threaded anchors, these can be used for hanging artwork, floating shelves, or bathroom hooks. Since this anchor is shaped like a plastic, hollow plug, it requires you to drill a pilot hole that matches the diameter of the anchor before you insert the anchor. The anchor should fit snugly inside the hole. When the screw is driven into the anchor, the anchor’s tip expands, locking it into place inside the drywall. Since a plug drywall anchor isn’t as strong as a threaded drywall anchor, it’s best for lighter-duty jobs of up to 25 pounds.
STEP 2: Use moderate pressure to twist a self-drilling wall anchor into drywall.
Photo: Peter Fazio
You only need to apply moderate pressure with a screwdriver to install threaded drywall anchors, as their points will self-drill into the wall. When the wide threads start to grab on, make sure you keep applying pressure so the anchor doesn’t simply spin in the hole and dig out the drywall. If you’re having a hard time getting the anchor started, drill a pilot hole using a drill bit that’s narrower in diameter than the anchor.
You can also use a cordless drill with a screwdriver bit to drive in the anchor, but you’ll need to do so carefully to avoid stripping out the drywall with the anchor’s threads. Drive the anchor in using a slow, constant speed and be sure not to overtighten it.
STEP 3: Turn the drywall anchor in until the lip is flush with the wall.
Photo: Peter Fazio
Whether using a manual screwdriver or cordless driver, be careful not to tighten the anchor so much that it actually becomes inset into the wall.
For plug anchors, push the anchor into the pilot hole until the lip is up against the drywall. You may need to tap the anchor with a hammer to drive it completely into the hole. The anchor should fit snugly inside the pilot hole. Resist the urge to force the plug into a hole that’s too small, which could damage the anchor or drywall. If the hole is too small, remove the plug and use a slightly large drill bit to widen the hole’s diameter.
STEP 4: Attach your rack or shelf to the wall by screwing into the drywall anchor.
Photo: Peter Fazio
Once again, make sure you first put the screw through the hole of the thing you’re attaching to the wall. (In this example, we’re attaching a bracket to the wall to support a small shelf. Note how the screw passes through the hole in the bracket before twisting into the drywall anchor.)
Photo: Peter Fazio
Here’s what it looks like behind your wall. The wide threads of a threaded drywall anchor and the serrations on the plug-style anchor help it to grab onto the surrounding drywall. When the screw goes in, it pops the barbs out for added power. Redecorating or moving out? When you have no use for them anymore, learn how to remove drywall anchors.
By using the methods above, you can dramatically increase the load-bearing weight of drywall from a pound or two up to 75 pounds. Since drywall anchors vary in size and load ratings, it’s crucial to take careful note of weight when working with these tools. While large threaded anchors may be able to hold up to 75 pounds, smaller plug-style anchors may only support up to 10 pounds. By paying careful attention to an anchor’s load limitations and the total weight of the item (along with the weight of any items it will hold) will ensure the anchor remains securely attached to the drywall.
If you’re wondering if you need to predrill holes for drywall anchors or how much weight a drywall anchor can hold, then read on for answers to these and other questions about these specialized fasteners.
Q. Do you predrill holes for drywall anchors?
Whether you need to predrill a hole for a drywall anchor depends on the type of anchor. Threaded drywall anchors do not need a pilot hole to install. If the anchor does not have a threaded tip, you’ll need to drill a pilot hole. Use a drill bit that’s the same diameter as the body of the anchor.
Q. Why are my drywall anchors spinning?
Your drywall anchor is spinning for one of two reasons. If the anchor required you to drill a pilot hole, you drilled too large of a hole. If you’re using a threaded drywall anchor, you have overtightened the anchor, causing it to strip out the surrounding drywall. You’ll need to drill a new hole in a different location on the wall or use a larger anchor and screw.
Q. Can you hammer in drywall anchors?
That depends on the type of drywall anchor. If you’re using a threaded anchor, you must use a screwdriver or cordless driver to install the anchor into drywall. Attempting to hammer it in will damage the anchor and likely the wall. You can use a hammer to tap an unthreaded drywall anchor into a pilot hole as long as the pilot hole isn’t too small. The anchor should go into the hole with light taps and fit snugly.
Q. How much can a drywall anchor hold?
A drywall anchor’s weight capacity depends on the type of anchor. Plastic threaded drywall anchors can support up to 75 pounds.
Additional reporting from Pete Fazio.
Types of drywall fasteners: overview, load tests
Or an article about how not to upset your wife with a new hole and “nail the shelf”.
Ah, drywall, ah Augustine Sackett! You gave us this miraculous and marvelous marvelous, with the help of which repairs can be facilitated, and almost any ideas for planning and redevelopment of premises can be realized. Donated, yes. But he did not tell about fasteners to this fragile building material.
Where does the
motherland fastening process begin?
With nails? You will split, leave holes,
mother will scold .
From self-tapping screws? Of course, if the load on each fastener element is small. Hang a picture – and then light, otherwise
will vomit his wife when sees another hole in the wall.
Old-fashioned method, “mortgages”? Like it’s getting warmer. You will mount the bars under the “gypsum”, you will sew them with self-tapping screws: the entire load is on the bars. Want later
to nail a shelf to attach something to the wall – and where to look for these bars now? If you find a place for the deployment of power structures behind a plasterboard wall, it will not always be convenient for installation, which was not previously planned.
Based on these conclusions, Mr. Sakket’s contemporaries invented a special hardware for drywall – an anchor.
Stopper and spacer, or briefly about the principle of action.
The principle of operation of any anchor is based on the phenomenon of pressure or friction, or, more often, their combination. Let’s explain.
On the one hand, for attaching something to drywall, there must be a “stopper” on the draft side of the wall, protecting the hardware from being pulled out. On the other hand, the fastener must enter into the body of the mounting hole itself, as if creating a “thrust”.
Thus, we arrive at a typical drywall anchor bolt design:
- The body is designed in such a way that it can form both a “stopper” and a “thrust” at the same time. For convenience, we will call the case a “sleeve”.
- There is a screw mount with or without a nut, with the help of which both the “stopper” and the “spacer” are directly formed. For convenience, we will call the screw, screw or self-tapping screw “bullet”.
The lyrical digression does not end there, since the above theses are just necessary conditions for good fastening. Sufficient conditions:
- The anchor must either have an anti-corrosion coating or be made of a polymer. Such a choice of materials has already proven itself in conditions of temperature and humidity differences, typical, for example, for the beginning and end of the heating season in Russia.
- The strength index of the anchor bullet is also an important characteristic. Not all the same pictures to hang. A chandelier in the house is also needed!
as an experiment out of control.
Instead of flooding our reader with water, consisting of scattered unverified information, our editors have tested the strength of the most used types of anchors experimentally.
Experimental plant consists of:
- 500x500mm square 12mm or ½ inch thick drywall sheet, scribbled so that the anchor can be easily installed exactly in the middle;
- wooden mandrel for drywall, with which it can be easily installed in the press;
- press with a wooden frame for a mandrel and a device for applying a controlled force to a hardware embedded in drywall.
- pull each hardware out of drywall three times, set the breaking force in kilograms;
- compare the result with the theoretical data on the package;
- evaluate the degree of failure of the drywall sheet for each anchor;
- when evaluating the results, be tied specifically to the type of anchor, and not to a specific manufacturer.
Metal dowel (anchor) type DRIVA
A very common beast in our area, in fact, an auxiliary hardware in the form of a screw with a high thread, in which a thread is made for the main fastener – also a screw or self-tapping screw.
During installation, it does not require special skills and knowledge, a screwdriver (or a screwdriver, as in our case) is enough. Drilling a hole for the “driva” is also not necessary; when screwing it in, it does it for you.
Due to utility, this hardware is presented in two sizes:
During the first approach, the following was found out: the failure of this type of hardware occurs at a load of 105lbs, which corresponds to 47. 6 kg. Given the information on the package (50lbs – 22.7kg), the result is more than impressive.
As for the destruction that this hardware leaves behind, the result is satisfactory, since the size of the hole is generally comparable to the size of the anchor.
Expanding dowel for hollow materials
An ordinary butterfly dowel, which is inserted into the wall in the folded position into a pre-prepared mounting hole. After mounting the screw or self-tapping screw, it opens, creating a spacer on the back of the wall.
Anchor dimensions mainly vary in length:
The dowel breaks for the first time at around 73 lbs, which corresponds to 33. 1 kg in the SI system. It turns out that the threshold for drywall (drywall) indicated on the package at 69 lbs or 31.3 kg has been crossed.
As for the size of the hole left in the drywall after this type of anchor is torn off, the result is much better than for the previous contestant.
|Butterfly dowel plastic
Break force, kg
|Information on the packaging
It is worth saying that this dowel-butterfly is a Western version of a product that is very common in our stores. Despite some structural differences, the material of manufacture is the same, and, accordingly, the tensile strength of both hardware is the same. As for the principle of operation, the classic “stopper” – “thrust” in both cases.
Plastic drop-down DRIVA
Unlike a metal counterpart, this “driva” has the ability to open behind a plasterboard wall under the action of a screw screwed into it. For installation, as in the previous case, a screwdriver or screwdriver is enough.
The first approach unspeakably surprised our editors. “Driva” she is “driva” in Africa, she knows how to keep the brand: both metal and plastic. The breakdown occurred at around 173 lbs or 78.5 kg, which, of course, seriously exceeds the limit set by the manufacturer (110 lbs – 49. 9 kg).
However, the further two approaches (102 lbs – 46.3 kg, 160 lbs – 72.6 kg, respectively) suggest that the spread of quality, not even from batch to batch, but from package to package, is very serious. This is explained by the production method (casting) and the material of manufacture (polymer – plastic, common for dowels).
In addition, the size of the “dismantling” hole leaves much to be desired. In the table, the results of the second experiment are marked in red, since the effort from the manufacturer was not achieved.
Break force, kg
|Information on the packaging
Judging by the positive feedback from amateur users and master finishers, this anchor can only be called the king of hipcore and the situation as a whole. When installing baby Molly, drilling a hole of the same diameter as the sleeve is required. Further work with it is no different from previous models.
This anchor is almost universal, because the diameters with which it is presented on the market are numerous:
Opening the anchor sleeve is similar to opening the crime of a spacer rivet. However, here an important detail awaits us: the photo shows that the petals of the anchor sleeve rest against the material so much that it is pressed through. You can avoid this by screwing the bullet not with a screwdriver, but with a simple screwdriver.
Returning to the results of the experiment, we note that all approaches were at the level. For example, the first breakdown occurred with a force of 92 lbs or 42.1 kg (factory force 80 lbs – 36.3 kg).
The torn-edge ripped hole is not comparable, much larger than the diameter of the MOLLY anchor sleeve. The king is dead, long live the king!
Break force, kg
|Information on the packaging
Expanding spring anchor
One of the oldest and simplest designs! Insert the hardware into the previously prepared hole according to the size of the drop-down part (it must be folded) and tighten the bullet (bolt) until it stops. However, the hole always turns out to be larger than necessary, and this negatively affects spontaneous dismantling.
Speaking of sizes:
The participants in our comparison go head to head, and even the “grandfather” of the anchors does not give up his positions. At the first breakdown, the force was 93 lbs or 42.1 kg (70 lbs – 31.8 kg factory).
As mentioned above, a very large mounting hole has a bad effect on the final result when the hardware breaks. Unsatisfactory huge hole.
Break force, kg
|Information on the packaging
Non-deforming drop-down MOLLY
Almost not found in the vastness of the Russian Federation type of anchor for drywall. The installation is the same as that of a conventional MOLLY, however, when tightening the bullet, the principle of the cartridge case mechanism is slightly different. The bolt first pushes the spacer, then tightens it.
The last contestant shows himself very well. The force of the first breakdown was 163 lbs or 73.9 kg against the manufacturer’s standards of 100 lbs or 45.4 kg.
We believe that the dismantling hole does not need comments.
Break force, kg
|Information on the packaging
Summary table of the results of experiment
We present the results as follows. An average value was chosen from each series of experiments, since it is impossible to talk about any statistics for three points, but the experimentally obtained average will be the most reliable result. The third column shows the value of the ratio of the practical stall force to the factory one. By this coefficient, you can evaluate the reliability of the hardware. Those. how many times it is more reliable than stated by the manufacturer.
Break force, kg
U. S. ave / U.S. h.
|Expansion dowel plastic
Can the anchor be reused? If yes, which one and in what case?
— Yes, you can. Driva metal anchors do not deform at all, and polymer butterfly dowels – irreversibly. For other types, the fatigue of the material will be quite high, the reconnection will weaken.
How to replace drywall anchor? Can it be crafted?
– Oddly enough, in this regard, there is talk of flap and spacer blind rivets, which, of course, our editors do not approve of. The fact is that the embedded head of such a rivet cannot provide the proper contact area with the working surface of drywall. In addition, when riveting, fragile drywall can be easily damaged. As for making an anchor for “gypsum” at home, it is much easier to use a ready-made solution and not waste your time and energy.
What is the difference between a drywall anchor and an anchor for hollow parts?
– In the forces with which the anchor is held in the part / material. In hollow parts, the anchor is held by the “stopper”, that is, the tightening torque of the bullet plays a greater role than how tightly the sleeve sits in the material, because the friction force has practically no effect on it.
All about fasteners
Updated: 25.05.2023 11:28:36
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Drywall anchors – types and features of application
Drywall is an inexpensive and easy-to-install finishing material that allows you to get a perfectly flat surface. But it has one drawback – it is increased brittleness under load. This must be remembered before hanging lighting fixtures, decorative ceilings or shelves on it.
If classic expansion anchor systems are used to fasten heavy objects, this can lead to the destruction of the finish. Therefore, special anchor fasteners have been developed for drywall that can withstand objects weighing 15-50 kg and more.
Classification of drywall anchors
Depending on the principle of operation, they can be divided into two classes:
- Through (opening) . Such fasteners require an empty space on the back of the sheet so that the anchor sleeve can open and firmly fix the screw. These include butterfly dowels and spring fasteners.
- Bushings . Such elements can be used in places where the sheathing is close to the walls. They have a length less than the thickness of the plate and a special thread with a wide pitch, they come with and without a drill. Through-hole fasteners with a drill act like self-tapping screws – they are screwed into the drywall and then a screw is used.
IMPORTANT . It is necessary to choose products from high-quality materials with an anti-corrosion coating (for example, from durable galvanized steel). Otherwise, the fastener spacer will not be able to create a strong enough fixation to hold a heavy structure for a long time.
In order not to make a mistake when choosing an anchor for drywall, consider the features of the use of each type of fastener.
Their main advantage is the ease and speed of installation. It is enough just to drill a hole in drywall, and then insert a rod with pressed blades into it. The final fixation is made by screwing in a nut with a washer. Thanks to a special spring, the blades turn from the back of the skin and are installed in the desired position, distributing the static load over a large area. Thus, the anchor is securely held in one position.
Spring elements can be supplied with screw, ring or studs with hook. They are used for mounting ceiling cornices, hanging chandeliers or false beams on the ceiling. They are not suitable for installing heavy wall-mounted equipment (boilers, batteries).
This name was given to the anchor because, when tightened, it is very similar to a butterfly bow. The wings, located on the outer part of the slotted cylinder, open when the screw is screwed in and rest against the drywall surface from the back. At the back of the element there are additional stiffening ribs that abut against metal protrusions and increase the strength of the open petals.
For different manufacturers, the shape of the anchor may differ (have a different wingspan, screw radius, neck length, thickness of the ribs at the dowel head), be made of metal or plastic, come complete with a nut, ring, hook or L-shaped head . That is, to fit different workloads and the thickness of the GKL.
Anker Molly is the most famous representative of this species.
These fasteners are made entirely of steel and are zinc plated to resist corrosion. They consist of 2 parts – a metal sleeve (collet) and a screw with a countersunk or semicircular head (the screw may not be included).
Molly dowels are quite expensive. But they are very popular, as they are distinguished by their strength, reliability and the ability to withstand heavy weight (up to 35 kg) due to the creation of a wide stop on the back of the skin. At the moment, they are in the assortment of all major manufacturers: HILTI has the HHD version, FISCHER has HM, MUNGO has MHD, SORMAT has MOLA.
To mount the Molly, you need a special tool that puts the fasteners on alert (ordinary pliers can be used). With its help, the screw is slightly pulled towards itself, and the hooks are bent. After that, you can already turn the screw with a screwdriver so that they bend all the way. But all these manipulations must be done after the closed dowel has been installed in the hole in the drywall.
One of the advantages of Molly is that the anchors can be reused, as the dowel can be easily removed from the wall without losing its properties.
These fasteners use the friction force and material resistance to breakage in the through-hole area as a holding factor. There are different types: metal and plastic, with a drill and without a drill. Steel with a tip in the form of a drill do not need a landing socket, plastic – only in the intended recess. They are screwed into drywall, and then the hanging object is fixed with a self-tapping screw.
Dowel Driva is a metal screw version with a self-tapping screw.
Designed specifically for weak substrates, it looks like a conical rod, along which a large screw thread with a large pitch is located. Due to the sharp tip at the end of the screw, the dowel easily cuts into drywall and is securely fixed. The flat head of the hardware has a special hole for a screwdriver or a “cross” screwdriver, which makes it easy to screw the self-tapping screw into the wall.
The popularity of the Driva dowel is due to its high reliability, low price and ease of installation / dismantling. But there is one condition for its use – the presence of a small space behind the stove. It is used for fixing medium and heavy objects (25-50 kg) on the GKP, when the use of another type of anchors is not possible due to the small space behind the skin.
Hanging heavy objects on drywall bases is easy, you just need to calculate the load and thickness of the base base, and then apply the appropriate fasteners and technologies.