Explain The Difference Between Wood Screws And Self-tapping Screws

Before explaining this problem, what needs to be understood is that fasteners can be divided into three categories according to the thread form, external thread fasteners, internal thread fasteners, and non-thread fasteners, while wood screws and self-tapping screws belong to Externally threaded fasteners.

        A wood screw is a screw specially designed for wood, which can be directly screwed into a wooden component (or part), and a metal (or non-metallic) part with a through hole is firmly connected with a wooden component. This connection is a detachable connection. There are 7 kinds of national standard wood screws, namely slotted round head wood screws, slotted countersunk head wood screws, slotted semi countersunk head wood screws, cross recessed round head wood screws, cross recessed countersunk head wood screws, cross recessed half countersunk head wood screws Countersunk head wood screws and hexagonal head wood screws, among which cross recessed wood screws are more commonly used, and among cross recessed wood screws, cross recessed countersunk head wood screws are the most widely used.

        Once a wood screw has entered the wood, it can be embedded very securely. If the wood is not decayed, it is impossible for us to pull it out. Even if you pull it out forcibly, it will damage the wood and bring out the nearby wood. So we need tools to unscrew the wood screws. Another thing we need to pay attention to is that the wood screws must be screwed in with a screwdriver, and the wood screws cannot be forced in with a hammer. This will easily damage the wood around the wood screws and the connection will not be tight. Wood screws have stronger fixing ability than nails, and they can be removed and replaced without damaging the wood surface, so they are more convenient to use.

        The thread on the self-tapping screw rod is a special self-tapping screw thread, which is usually used to connect two thin metal components (steel plate, saw board, etc.). As the name implies, the self-tapping screw can be tapped by itself, it has high hardness, and can be directly screwed into the hole of the component to form a corresponding internal thread in the component.

        Self-tapping screws can tap internal threads on the metal body to form thread engagement and play a fastening role. However, due to its high thread base diameter, when it is used in wood products, the cut into wood will be relatively shallow, and due to the small thread pitch, there will be less wood structure between each two threads. Therefore, it is unreliable and unsafe to use self-tapping screws for wooden mounting parts, especially looser woods.

        The above is the introduction of wood screws and self-tapping screws. I hope it can help you to distinguish between wood screws and self-tapping screws. Simply put, wood screw threads are deeper and more spaced than self-tapping screws, self-tapping screws are sharp and hard, and wood screws are sharp and soft.