Screw is the most common and basic type of fastener, which appears in a variety of models on the market. They have different sizes and are made of different materials, such as self tapping screw, bridge screw, grade screw, etc. Make them suitable to sustain everything from microcomputer components to large-scale industrial machinery.
It is worth noting that there are two types of screws
A small screw with a diameter of 1 mm to 8 mm is called a small screw. The surface is black, called "black screw"; The small screw with silver plating on the surface is called "cosmetic screw". In our copier, small black screws are mostly used for the installation of parts that do not require too much effort, and they are all inside the machine to fix a certain part inside“ The "make-up screw" is generally used to install the shell of the machine, which can be seen by the user and also plays a decorative role. It is more beautiful
The thread of self tapping screw is deeper and thinner than that of small screw. The head of a self tapping screw is usually pointed. The reason why it is called self tapping screw is that it is mainly installed on the plastic. As long as there is a hole in the plastic, it doesn't matter whether there is a thread or not. Self tapping screw can make a hole with thread by itself. Self tapping screw back torque is very big, prevent loose effect is better than small screw, this is its advantage.
However, compared with other fasteners, nails and screws have several obvious advantages
1. Advantages of machinery
Screw provides mechanical advantage. Driving in the screw takes less power and time than opening the nail to the same material. Builders use hand tools, which can make construction projects much easier when it comes to screws. Power tools and screws need less force and tool movement to reduce pressure.
2. Intensity
Screws are very strong. Other connecting materials begin to expand and shrink over time, and screws resist this problem and continue to create a strong protective layer. Because screws are stronger, a construction project can use fewer screws, thus reducing the cost of the project and speeding up the process.
3. Rust resistance
Strong, tight screws also make them rust resistant, preventing moisture and contaminants from contacting the metal spiral shaft. Even if the screw head starts to rust, the shaft will remain unchanged and continue to hold.
4. There are many kinds
Different sizes of screws and different thread patterns are specially designed for materials such as wood, gypsum board, metal plate and concrete. The long-term strength can be improved by using proper screw type. There are also many different types of screws, from traditional cross head and slotted head to round head, pan head, plum head, countersunk head, etc. These various screws make them suitable for use with different types of tools.
5. Easy to unload
Easier to unload than other fastener screw types. A simple special tool can pry loose, screws can also be reused, because they rarely bend in the removal, they can even be inserted into the same hole for use
