1. Wood screws are also called wood screws. They are si […]
1. Wood screws are also called wood screws. They are similar to machine screws and can be directly screwed into wooden components to fasten a metal (or non-metal) component with a through hole to a wooden component. This connection It also belongs to the detachable connection. Wood screws have low strength and can only be screwed in relatively hard places. Commonly used wood screws have a diameter of about 2.5-4mm. There is no matching screw cap. Use it with a flat-head or Phillips screwdriver.
2. Self-tapping screws are used for non-metallic or softer metals and do not need to drill holes. It is mainly used for the connection and fixation of some thinner plates, such as the connection of color steel plate and color steel plate, and the connection of wall beams. Self-tapping screws are often exposed outdoors and have strong corrosion resistance.
Although these two kinds of screws are similar in some aspects, there are still differences:
A. Self-tapping screws require manual operation, and the screws are small and the scope of use is also limited.
B. Self-tapping screws have high hardness, wide thread spacing, deep threads, and non-smooth surface.
C. Wood screws have no threads at the back end, and the threads are thin, sharp and soft, while self-tapping screws have thick threads, sharp and hard.