Are screws stronger than screws
Screws - the right screw for your project
The different types of screws are assigned to specific materials and areas of application. Head and thread must be adjusted accordingly in order to grip properly and to perform the function. In this way, screws connect two workpieces or areas as firmly as possible, but can also be loosened and removed again later. A distinction is made between the following types:
From the substructure to chipboard or terrace construction - wood construction screws know many areas of application. The thread and point of these models are made particularly coarse so that they can be driven quickly into the wood. Pre-drilling is often not necessary. Chipboard screws, for example, have a countersunk head. Others later disappear optically with matching cover caps. Construction screws, in turn, must be specially approved for use on construction sites. The most popular wood and dowel screws include the following types:
- Chipboard screws
- Drywall screws
- Concrete screws
- Screw hooks & eyebolts
- Adjusting screws
- Hanger bolts
Metal screws usually have a fine metric thread. In addition, it often depends on the thread lengths whether they are kept short or made continuously. They are mainly used to process metal parts. Other typical features are the blunt tip and the cylindrical shape. In combination with a nut or other mating thread, it creates a very strong and durable connection. Metal screws are also often referred to as machine screws, for example with a standard thread, with a fine thread or with an inch thread.
Sheet metal screws
In terms of their appearance, tapping screws can easily be confused with wood screws. They too have a sharp point and are available in different materials. However, it is a hardened special thread that drives the screw into the workpiece without pre-drilling. In addition to sheet metal, they are also used for plastic sheets. A distinction is made, for example, between self-drilling screws and thread-forming screws.
The universal screws are used for all connections for which no special screw type is assigned. They are versatile and can be used for different materials, such as plastics. They follow DIN and standard parts in all trades and sizes. Eye bolts and screw plugs are known, for example.
Choose screw material - stainless steel, steel or brass
When choosing the right screw, it is not only the workpiece to be processed that plays an important role. The material of the screw itself must also match the area of application. Therefore, there are different screw materials, depending on the stress and construction project. The following points must be observed:
|Steel screws||Steel screws are used for normal use. The surface is usually treated to make the material more durable and to protect it from rust (galvanized, blue passivated or yellow chromated). Nevertheless, these screws are more intended for indoor use, as they have very little corrosion protection and should not be exposed to moisture.|
|Stainless steel screws||Stainless steel is very difficult to rust and is often used outdoors. A distinction is made between A2 and A4 stainless steel screws. The former do not withstand permanent moisture and are only designed for moisture. The latter are even protected against acid and sea water. They are often used in coastal regions and in the food industry. On the other hand, the A4 stainless steel screws are less flexible.|
|Brass screws||Brass screws are made from a copper-tin alloy. They can be chrome-plated, nickel-plated or even bought blank. They can usually be recognized by their golden color and are often used in sanitary areas, where a certain amount of moisture must be expected.|
|Alloys||In addition to the materials mentioned above, there are many different alloys and coatings. They are all adapted to the possible areas of application, should last a long time and not rust. There are temperature-resistant screws with good corrosion protection and models that are not electrically conductive, depending on the alloy.|
What screw drives and screw heads are there?
Modern screw connections have to meet high requirements. In addition to the thread and the material, the selection here is often based on the right screw drive. There is a large selection from the cross recess to the hexagon socket. Of course, the tool must always match the screw in order to be able to transfer the forces effectively. With the right drive and the right assembly tool, you can achieve a higher torque and make the screw less prone to wear. So choose between the following drives:
|Pozidriv screws (PZ)|
|Hexagon drive outside|
|Hexagon drive inside (Allen)|
|Six-round drive (Torx)|
The choice of screw head depends on its practical use and aesthetic appearance. Should it have a more decorative character? Perhaps the subsurface shouldn't be indented? Or is it a difficult to access place? Choose from the following options:
The lens head is flat and rounded. It is usually made of brass or is burnished.
The countersunk head is more funnel-shaped and can disappear flush with the material. There are different sized screw heads.
The cylinder head is usually round in shape. The drive is internal.
The hexagon naturally has a corresponding hexagonal shape and impresses with its powerful drive.
Purchase criteria for screws - drive, thread and material
It is almost a feat: to find exactly the right screw for your project from the large selection. First of all, you should know the material that is being screwed into. For certain building materials, such as plasterboard, MDF or metal, only certain screws are suitable. In addition, thread types and strength classes play an important role. We have summarized the most important purchase criteria for you in a table:
So far we have shown you the basic and important types of screws. Of course, the selection is much finer if you have a special workpiece or a special project in mind. You can find more information on this in the individual guides. Just as frequently used types of screws are:
- Plank screw
- Frame screw
- Knurled screw
- Carriage bolt
- Eternit screw
- Wing screw
- Grub screw
- Facade screw
- Terrace screw
- Hanger bolt
- Adjusting screw
- Construction screw
The main manufacturers - Spax, Fischer and Connex
Some manufacturers convince with a complete range of screws for all purposes. Others have specialized, for example, in quick construction or drywall construction. Here we would like to introduce you to three important sizes on the screw market in more detail.
Whether at the specialist dealer, in the hardware store or online - you can buy screws everywhere. Decide for yourself whether you need specific advice and have the specialist dealer show you the alternatives. In the hardware store at OBI, Toom or Hornbach there are sometimes cheap bargains to be found or individual items to be bought. On Amazon, for example, large assortment boxes or quantities of screws attract visitors at a low price. Even B-goods can be found on online marketplaces. Here you only have to expect that some screws have a defect. Other well-known screw brands are:
The prices - buy individually or as an assortment?
The only question now is whether you would prefer to buy the screws individually or buy a larger package right away. Of course, bulk packs or assortments are much cheaper. In addition, most screws can be stored very well in a dry place. So you can use it again for a later project. Universal screws or wood screws in particular are more suitable in bulk packs. But if you are dealing with special screws, you should choose a smaller pack or buy an exact number of pieces in order to save costs. After all, the prices of special screws are significantly higher. The same applies to screws made of a particularly strong and durable material.
Essential accessories: nuts, washers and dowels
Various screws and threaded bolts must also be secured: with a nut. This screw nut is provided with its own internal thread and offers the ideal counterpart to the actual screw. So pay attention to the metric thread, which is mainly used in metal processing and mechanical engineering. A distinction is made between different mother models:
- Hex nuts - most common shape
- Wing nuts - can be tightened without tools
- Cap nuts - are closed on one side and protect the screw thread
- Lock nuts - use a plastic ring to prevent accidental loosening
If the pressure on the nut is very high or on the material in question, washers must be used. They are available in different sizes in stores, mostly round, and help to distribute the forces over a slightly larger area.
If you want a screw to hold particularly tight and not be so easy to pull out of the material, there are dowels. These absorb a greater force, spread apart and ensure an optimal hold. Dowels are mainly used for screw connections in concrete or stone, as the screws alone would not hold in the fine and dusty material.
About us - comprehensive screw guides
We offer you a comprehensive guide to the individual types of screws and their matching accessories. We take a closer look at each individual screw in terms of its properties, area of application and structure. So you are sure to find a model that also fits your project. We report independently, respond to expert opinions and incorporate customer experience into our texts. So you get all the important facts about the screw you want put together in one compact article. We hope you enjoy building!
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