![]() Wood screws, chipboard screws and lag screws are generally zinc-coated. Zinc-coated steel screws: these screws have a zinc coating that allows them to be moderately corrosion resistant.Screws are designed to be made of materials that are suitable for their intended use. ![]() ![]() Cylindrical screw heads: these are recognizable by the flat underside of the head which ensures better surface contact.They are also equipped with a washer that remains on the surface. Button screw heads: these screws have the same advantages as countersunk screws.They are fully integrated into the material and are often favored in carpentry. Countersunk screw heads: these screws are generally used in wood or plaster.Square screw heads: these are flat screw heads that allow the user to screw them in easily with one hand.Hexagonal screw heads: these screws are more difficult to fasten than the others and require the use of an Allen key screwdriver or hex drill bit.You can choose from the following screw heads: Secondly, because some screws are used to assemble large parts, it is important to choose a screw head that will not loosen easily to hold the assembly in place. It is first important because, depending on your application, you may need a screw with a head that penetrates the material completely, or conversely, that protrudes from the material. Why is it important to take into account the screw head? It is essential to choose a screw that is resistant enough for the environment in which it will be used. The material of the screw is not something to be taken lightly. The screw can be threaded along its entire length or only on a part of the shaft. We also recommend that you pay attention to the thread that runs the length of the screw shaft. Some screws have special shapes and therefore require the use of an adapted tool. These elements are essential because they determine both the strength of the screw, but also whether it is truly adapted to your needs.īefore buying screws, we recommend that you make sure you have the right screwdriver or drill bit. You will then have to choose your screws according to their length and diameter. Each type of screw has its own characteristics and is optimized for use with a specific material. There are screws for concrete, wood, PVC, plaster, etc. There are many different types of screws, each corresponding to the material they will be used for. Tri-Wing screws were used by Nintendo on its Gameboys, and don't have a driver associated with them, which has discouraged even minor home repairs to the units.The first factor that will guide your choice of screw is the material it will be screwed into.Tamper-proof Torx's drive sockets have a projection to prevent a standard Torx driver being inserted.Torx head screws have a splined socket and receive a driver with a splined shaft.Robertson drive head screws have a square hole and are driven by a special power-tool bit or screwdriver (this is a low-cost version of the hex head for domestic use).Hexagonal or hex screw heads have a hexagonal hole and are driven by a hexagonal wrench, sometimes called an Allen key or a power tool with a hexagonal bit.The Pozidriv is an improved Phillips head screw, and it has its own screwdriver, similar to cross-head but with better resistance to slipping, or cam-out.Cross-head or Phillips screws have an X-shaped slot and are driven by a cross-head screwdriver, designed originally in the 1930s for use with mechanical screwing machines, intentionally made so the driver will ride out, or cam out, under strain to prevent over-tightening.Slot head screws are driven by a flat-bladed screwdriver.
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