Fasteners can be divided into three categories according to the thread form, external thread fasteners, internal thread fasteners, non-threaded fasteners, wood screws and self-tapping screws are all external thread fasteners. A wood screw is a kind of screw specially designed for wood, which can be directly screwed into a wooden component (or part) to fasten a metal (or non-metallic) part with a through hole to 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-counter head wood screws. Countersunk head wood screws and hexagon head wood screws, among which cross recessed wood screws are more commonly used, and cross recessed countersunk head wood screws are the most widely used among cross recessed wood screws.
Once the wood screw goes into the wood, it can be embedded very firmly in it. 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. Therefore, we need to use tools to unscrew the wood screws. Another point we need to pay attention to is that the wood screws must be screwed in with a screwdriver, and the wood screws cannot be forcibly knocked in with a hammer, which will easily damage the wood around the wood screws and the connection is not tight. The solidification ability of wood screws is stronger than that of nails, and they can be removed and replaced, which does not damage the wood surface and is more convenient to use. The thread on the self-tapping screw screw is a special self-tapping screw thread, which is usually used to connect two thin metal components (steel plates, saw boards, etc.). As the name suggests, the self-tapping screw can be self-tapping, it has high hardness, and can be directly screwed into the hole of the component, so that the corresponding internal thread is formed in the component.
The self-tapping screw can tap the internal thread on the metal body to form thread engagement and play a tightening role. However, due to its high thread bottom diameter, when it is used in wood products, the cut into the wood will be shallower, and due to the small thread pitch, there is less wood structure between each two threads. Therefore, it is unreliable and unsafe to use self-tapping screws for wood mountings, especially loose wood. The above is the introduction of wood screws and self-tapping screws. I hope it can help you distinguish between wood screws and self-tapping screws. In simple terms, wood screws have deeper threads than self-tapping screws, and the spacing between the threads is also greater. Self-tapping screws are sharp and hard, and wood screws are sharp and soft.
Post time: Sep-23-2022