Screw knowledge

Screws, also called "screw" (screw), "screw" (screw). In fact, screws are known generically, and screws and screw rods are different from each other. Screws are generally called wood screws; they have a pointed tip and have a large pitch and are generally used to fasten wooden and plastic parts. The screw rod is a machine screw (mechanical screw), which is the type with a flat front end. The pitch is small and uniform. It is generally used to fasten metal and machine parts.
Screws are a common invention in people's life and production for thousands of years. According to application fields, it is the largest invention of human beings. Mainly cutting tools, production and processing supplies, construction supplies, operating supplies, environmental safety supplies, logistics and storage supplies, research and management supplies, construction tools supplies series.
The main purpose is to make a high degree of industrial products fixed and integrated, if in use often occurs between the teeth and teeth can not be close, too hard to lock the screw head off, or bad teeth lock is not tight and so can not meet the conditions of use, are For quality problems. Screws are "quantity products" and are not hand-made artworks. In mass production, they are intended to provide consumers with high-precision, stable quality and affordable prices. The precision of the screws is usually 6g (2nd grade, U.S. specification "IFI" is 2A teeth), and the crude screw used in construction projects is 8g (3rd grade, "IFI" is 1A teeth). The value of screws is very important. There are examples in the world of bankruptcies caused by poor screw quality. There are also examples of aircraft crashes and vehicle subversion due to poor screws.
Screws are good for the use of our lives and there are some inconveniences. As long as we deal with them properly, screws can have a great effect on our lives.

Small Stone Series

Small stone series

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