Expansion bolts are very often used fasteners. The use of expansion bolts not only ensures quick assembly and stability of the fastening, but also helps avoid damaging the wall structure and damaging the plaster. We suggest what to look for in the case of expansion bolts and how to choose the right expansion bolt for plasterboard, polystyrene and concrete.
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What should you consider when choosing an expansion bolt?
Expansion plugs are available in a variety of designs. Some plugs are made of plastic (e.g. polypropylene), others of metal. There are many lengths of plugs to choose from, usually from 28 mm to even 200 mm. The expansion plug should be matched to the specific application, in particular to:
- material and properties of the substrate,
- weight of attached objects,
- mounting hole diameter.
Correct fit is the basis for reliability and long service life of the fastening. Most models available on the market are universal expansion plugs, which are a good choice for non-cracked concrete, aerated concrete, gypsum plasterboard (plasterboard), aerated concrete, hollow blocks or solid ceramic bricks.
Universal plugs usually have dedicated screws or bolts in the set. These elements are different from each other, although they are often treated as synonyms by non-professionals. Therefore, when looking for universal plugs with screws, you may encounter a situation where instead of typical screws there are screws, e.g. with a hexagonal head. If you decide on a set of universal expansion plug + screw, be sure to pay attention to the dimensions and material of the screw. Galvanized steel guarantees strength and corrosion resistance.
It is worth consulting a specialist to choose the right anchor - especially if you lack knowledge and experience in renovation and construction work and intend to mount heavier elements. The fitter will assess the possibilities of the substrate and select the optimal mounting solutions.
How to choose the right expansion bolts for plaster?
Plasterboards, commonly called gypsum boards after one of the key manufacturers (Rigips), very often appear in new construction. They are used to create partition walls, wall cladding, alcove structures and suspended ceilings. The gypsum board plug should be matched to the type and weight of the device or other item you plan to attach to the board. There are standard expansion plugs with a straight screw, versions with a hook and special versions made of metal.
Relatively light elements, such as mirrors, shelves or wall lamps, can be successfully hung on plaster using a standard/universal dowel. Thanks to the collar on the edge, there is no chance that the dowel will fall into the drilled hole. In the case of heavy loads, in the range of several dozen kilograms or more, you will need a special solution. Remember to carefully read the specification of the given product and check the thickness and strength of the substrate, e.g. kg walls.
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Which expansion bolts are suitable for polystyrene?
Styrofoam is used in construction mainly for thermal insulation. This is a very specific substrate, so you will need a special dowel for Styrofoam , which will ensure the correct positioning of the boards and their tight adhesion to the facade. Special types of dowels, so-called screw-in screws, are used in fastening various types of lightweight elements to insulated building facades. They allow you to attach an information board, sign, external lighting or a camera. The dowels should be 5 cm longer than the thickness of the insulation.
What material should concrete plugs be made of?
Both universal expansion bolts and specialist metal anchors are used to securely fasten elements in concrete. The choice depends on the weight of the objects you want to fasten. If these are to be cabinets, shelves, mirrors, RTV equipment or wall decorations, you can use a universal expansion bolt - of course after checking the maximum load in the product specification.
We offer universal plugs made of high-quality polypropylene or nylon, designed for use in almost all building materials: concrete, thermal blocks, bricks, plasterboard, aerated concrete and others. The set includes a screw with a conical head. You can easily choose the right drill. Special steel anchors for concrete are used to attach heavier objects. At the Onninen wholesaler, you can buy a concrete plug (aerated concrete) made of electrolytically galvanized steel, the installation of which involves hammering in - it does not require drilling. Driven expansion plugs (another name is quick assembly plugs) are used for through installation.
In what situation will a double-threaded screw be useful?
A double-threaded screw may be included in the set with the expansion plug (its so-called shirt). This is a unique type of screw, distinguished by its unique design. It provides maximum precision, durability and reliability of fastening and easy disassembly of objects. It has two threads - external and internal, a head acting as a key and a pin. A key holder may be located between the threads.
The double-threaded screw is widely used in construction, where it is used for wall and ceiling mounting. It is also used in the machine and automotive industries and in the production of sports equipment and RTV/AGD devices. Double-threaded screws differ in length, metric thread size, screwing system, type of surface protection and material of manufacture.
Expansion bolts at the Onninen wholesaler
At the Onninen installation wholesaler , we know that solidly made and properly selected expansion bolts are the basis for safety, aesthetics and long service life of fasteners. We offer both universal expansion bolts, as well as special variants, designed for heavy loads, unusual building materials and difficult environmental conditions. Our range includes expansion bolts for installation in gypsum, aerated concrete, brick, polystyrene or concrete, enabling the attachment of light and heavier objects, e.g. kitchen cabinets or sanitary equipment.