What should you consider when deciding which self-drilling screw to use? Below we have outlined some considerations to take into account when making your selection. You should select your screw type based on the material and finish you require. Self-drilling screws are available in the same head and drive types as self-tapping screws. *Wings are only present on Remer Tek screw. This design allows the screw to bite into the material for a secure hold. The flute on these screws is very small and the diameter of the hole that it drills is smaller than the diameter of the outside screw thread. If you require Tek screws for wood applications you can use ones which are manufactured for roofing. Their low-dome shaped head makes tampering with or removing the head difficult. Truss head screws are suitable for sheet metal and other material with large diameter holes. This self-tapping screw head is extra wide and has a slightly rounded surface, or top and contains a wider surface area under the head of the screw. Less susceptible to the bit slipping (cam-out) than a traditional Phillips screw when you are driving the screw into the material.Ĭare should be taken to ensure that the screw is not over tightened. The larger clamping area allows for the force to be distributed across a wider area. This screw head is used where a large clamping area & an unobstructed head is required. They are typically used in high torque applications into either metal or wood They are similar to oval or round screws. The head of this screw is rounded on the top and vertical on the sides. The conical under-head does not extend to the outer edge of the screw head, which allows for a flush fit on wood and other softer materials. Wafer head screws feature a flat top surface and countersunk head. These screws feature a hexagonal head and are typically used by contractors in heavy-duty applications where a countersunk head is not necessary. The flanged head allows more clamping torque to be applied than other head types. Usually used to attach metal to metal or plastic to plastic. Due to the dome shape, there is less chance of the screw head countersinking into the material. The shape of the bugle head allows distribution of the stress over a much wider area than is possible with a flat head screw.īugle headed screws are used to attach plasterboard to wood to metal studs.īutton head, dome head and pan self-tapping screws The bugle head screw features a countersunk head with a flat top and a concave bearing face. Less prone to the head of the screw being compromised and distorted when driving into the material, due to the shape of the driver used. This allows for a flat finish and a smooth result. If you experience stripped threads you should use a larger thread-tapping screw when reattachment is made.Ĭountersunk or flat head self-drilling screwsĪllows for a flush finish as the head of the screw sits below the surface of the surrounding material. The drawbacks to using this type of screw is when they are removed it can result in stripped threads. Thread-tapping screws remove material and create a path for the screw. Remember to make the pilot hole smaller than the diameter of the thread tapping screw. Thread-Tapping: These screws do not require a pilot hole but one can be drilled to make fastening easier. Care should be taken as there is a risk of over-tightening the screw, which can result in joined materials breaking from the pressure. Due to their design they typically grip material more tightly. Thread-forming screws are usually used to join plastic materials together. Thread-forming: Before you can use these screws you will need to drill a pilot hole as the screw itself does not contain a pointed tip. There are two types of self-tapping screws, thread-forming and thread-cutting. Self-tapping screws are typically used to secure wood, plastic, metal and brick together. The action of driving the screw in will result in the self-tapping screw cutting a thread into the material and securing the materials together. Pointed nose self-tapping screws do not require a pilot hole. Blunt nose and flat ended Self-tapping screws require a pilot hole slightly smaller than the screw diameter to be created before they can be driven into the material with a screwdriver.
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