This way, there’s nothing jutting out for things to get caught on and the finish is much neater and better looking, necessary in sofas and other frequently used or passed by furniture.įlathead screws can have varying degrees or angles from the top of the head to the meeting point of the threads and the head.Ĩ2 degrees is standard and the most commonly available and used, but you can also find 90 degrees, 100 degrees, and other angles. Flat Screw Headsįlat screw heads are countersunk, which means that they sit completely flush with a surface or a little bit below it, ensuring that the screw head isn’t exposed. To prevent yourself from being driven crazy searching for information on each of the screw head types, here’s a primer to get you started. Stripping the head can become a nightmare of having to drill it out later or using pliers to turn it back out. This is important, as using the wrong driver could damage the screw and thereby, the material you’re driving it into. Learning to distinguish based on types of screw heads is not only easier and helps you identify the type of screw but also helps you figure out which driver is to be used with the screw-win-win all around. In such cases, life gets easier when you realize that you can tell screws apart very simply based on one key physical characteristic-the screw head. Given the abundance of screw types out there, you could go nuts trying to figure out each one and learning to distinguish it from the rest based on its uses and characteristics-it could take you weeks to figure it out. The head can be flat or countersunk so that when the screw is driven in fully it sits flush with or below the surface it can also have various shapes that allow greater torque to be applied.Collecting all the screwdriver bits for the different types of screw heads out there is extremely important you don’t want to have to make a run to the hardware store each time you start a new project. There are many screws for different purposes: wood screws, machine screws, cap screws, self-tapping screws, drywall screws, etc. Screws are used to fasten materials by digging in and wedging into a material when turned, while the thread cuts grooves in the fastened material that may help pull fastened materials together and prevent pulling out. What is a Screw?Ī screw is a type of fastener, in some ways similar to a bolt (see Differentiation between bolt and screw below), typically made of metal, and characterized by a helical ridge, known as a male thread (external thread). This is due to the fact that the screw head is not countersunk into the material, which allows for more surface area contact and a tighter grip. Non-Countersunk Screws heads offer superior holding power. Non-countersunk screws are best used in materials that are too thin to countersink the screw or when a flush surface is not required. The head sits above the surface of the material being fastened. Non-countersunk screws have a flat head with a Phillips, hex, or slotted drive. A counterbore may also be used, which is a pilot hole with an enlarged area at the bottom for the head of the screw. The hole should be deep enough so that the head of the screw is flush with the surface. Countersunk screws are used in many applications where a flush finish is desired, such as in cabinets and furniture.Ĭountersunk screws are installed using a drill and bit that is slightly smaller than the screw diameter. The most common type of countersunk screw has a 90-degree angle, but other angles are available as well. Countersunk and non-countersunk Screw Heads (ref: Wonkee) Countersunk Screws headsĬountersunk screws have a conical shape with a flat bottom, which allows them to be flush with the surface when installed.
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