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:

Wood screws

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

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.

Universal 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:

Screw materialDetails
Steel screwsSteel 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 screwsStainless 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 screwsBrass 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.
AlloysIn 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:

Screw driveparticularities
slot
  • is one of the classics
  • no centering available
  • Tools can quickly lose their grip
  • is considered to be quite laborious
  • not suitable for high torques
Phillips
  • good power transmission
  • for high speeds and torques
  • also known as the Philips Phillips head
  • self-attracting function
Pozidriv screws (PZ)
  • Further development of the cross-head screw
  • is used for quick assembly
  • star-shaped notch on the screw head
  • secured against slipping sideways
  • very good power transmission
  • for fast screwing operations
  • little counterforce necessary
  • mainly used in timber construction
Hexagon drive outside
  • The screw head serves as the drive type
  • Drive, for example, with an open-end wrench
  • visually attractive
  • high force on the screw head
  • can lead to deformation
Hexagon drive inside (Allen)
  • The drive is inside the head
  • realized as a hexagon
  • can be operated with an Allen key
  • Externally round screw head
  • decorative screw connection
Six-round drive (Torx)
  • Shape of a star
  • use a lot of craftsmen
  • very good power transmission
  • fast and material-friendly work
  • Torx T as hexalobular socket
  • Torx E as an outside hexagon
  • Torx Plus in elliptical shape
  • Torx TR particularly powerful
Motorq
  • new type of drive from Philips
  • Developed for aviation and lightweight construction
  • spiral prongs
  • suitable for very high torques
  • flat screw head possible

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:

Pan head

The lens head is flat and rounded. It is usually made of brass or is burnished.

advantagesdisadvantage
  • optically very decorative
  • The head does not penetrate the workpiece
  • hardly any risk of injury
  • Furniture
  • Modelling
  • on sensitive surfaces

Countersunk head

The countersunk head is more funnel-shaped and can disappear flush with the material. There are different sized screw heads.

advantagesdisadvantage
  • concise conclusion
  • low risk of injury
  • Putting on further workpieces possible
  • Woodwork
  • Wood connections
  • Construction

Cylinder head

The cylinder head is usually round in shape. The drive is internal.

advantagesdisadvantage
  • for hard-to-reach places
  • only accessible from above
  • low risk of injury
  • Metal processing
  • vehicle construction
  • Electrical trade

Hexagon

The hexagon naturally has a corresponding hexagonal shape and impresses with its powerful drive.

advantagesdisadvantage
  • low pollution
  • ideal for screws and nuts
  • fixed screw connections
  • large torques possible

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:

criteriaHints
Screw type
  • precisely match the material / area of ​​application
  • Wood and chipboard screws
  • Sheet metal screws
  • metric screws
  • Metal screws
  • Drywall screws
  • Self-drilling screws
  • Universal screws
  • Concrete screws
thread
  • Partial and full thread
  • for timber construction with self-tapping thread
  • allows screwing in without pre-drilling
  • metric ISO thread for metal screws
  • Comparison with thread table
  • important for connection with a mother
drive
  • determines torque and power transmission
  • defines tool
  • Slot or cross recess
  • Hexalobular Torx
  • Screws with Philips and Pozidriv
  • Hexagon screw drive (mechanical engineering)
Strength class
  • defines the tensile strength and yield point of the material
  • matched to the intended use
  • Tightened screws are under tension
  • the head could tear off as a result
  • 10.9 means 1,000 N / mm² tensile strength and 900 N / mm² yield point
material
  • simple steel screws
  • Stainless steel screws with corrosion protection
  • Brass screws
  • metallic alloys
  • most screws are surface treated
  • Use separately for indoor and outdoor areas

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.

Manufacturerparticularities
Spax
  • Specialist in connection technology
  • founded in 1823 as a German company
  • high quality
  • Fast and safe processing
  • recognizable by the green packaging
  • own screw head
Fisherman
  • founded in 1948
  • Invention of special dowels
  • modern screw technology
  • particularly deep bit seat
  • protects tool and workpiece
  • Specialist in terrace screws
Connex
  • rather cheaper manufacturer
  • known from the hardware store
  • many universal screws
  • whole assortment boxes
  • suitable for do-it-yourselfers and professionals

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:

  • Bosch
  • Dresselhaus
  • Fermacell
  • knob

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!