Types of screws

With wood screws, a kind of wood screws that can load a larger, used for wood-iron plate between the connection Note: the wood screws mentioned here is this kind, hexagonal head, generally we can not be used, mainly used for the larger volume of wooden objects and iron between the connection.

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Many people mentioned drywall nails used in wood, in fact, there are two kinds of drywall nails, coarse teeth and fine teeth. We generally use the fine tooth ones, and the coarse tooth ones are better if the drywall nails are used on wood. Did you notice that the drywall nails in the pictures below have different threads? The ones on the left are the coarse threaded drywall nails and the ones on the right are the fine threaded drywall nails we use most of the time. I've never understood exactly what the coarse threaded drywall nails are for, or why they are there, and for what purpose they were made in the first place.

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1. The reason there is a portion of the back of a traditional wood screw that is unthreaded is because there is one piece of wood that cannot have threads on it when pulling two pieces of wood together. Only then the wood screw can be like a shaft through the first board and the second board tightly linked together, its tension comes from the screw butt and the gap between the second board, you can do a test, in a board on a wood screw, when you keep screwing the screw into when you will find the screw butt and the board of the gap is getting smaller and smaller, the smaller the gap the bigger the tension, and vice versa. 2. why wood screws will be eliminated should be because it is not possible for a wood screw to be threaded. Why wood screws will be eliminated should be too low for its efficiency, the standard wood screw installation process is to first play out the step hole and then screwed into the screws, so that it is necessary to work twice to complete. But the actual work of not many people to play the step hole, (surface decorative screws and removable screws with copper guard ring except) are a one-time screw into the screws, but the tip of the wood screws are too blunt for a moment or two can not be screwed, the efficiency of a significant drop. The butt of the screws is in the shape of one when you screw in hard if the screwdriver is not positioned correctly, it is easy to slide out and damage the surface of the workpiece. When you install a narrow workpiece in the high altitude is the most prominent, the installation of hanging cabinets is the most obvious, to two people to lift a person on the screws, it is very strenuous.3. In summary, the self-tapping wire class to solve these problems. Sharp tip good positioning, screws do not run off. Butt cross-shaped good force, screwdriver does not slip. With power tools for overhead work easily.

Self-tapping screws high hardness, wide thread pitch, deep threads, the surface is not smooth, wood screws on the contrary, the other difference is more obvious, the back section of the wood screws have no threads.

The wood screw threads are fine, blunt and soft. Self-tapping screw thread is thicker, sharp and hard.