What is a screw?

If you were asked "What is a screw?" again, many people may be confused and don't know how to answer it. The concept of a screw can basically be described as a surface along a cylinder or a cone. Objects with spiral grooves and grooves. With regard to the impression of spiral grooves in screws, let's do a simple experiment to see. First draw a right triangle on paper and cut it out, and then put this A right-angled triangle is rolled into a cylinder along a right-angled edge so that the hypotenuse of the right-angled triangle forms a curve on the side of the cylinder. This curve is called a spiral curve. The screw that mimics this curve shape is an external thread. The screw, and the screw opposite to this male screw, is the screw inside the cylinder. It is a female screw. Most of the direction of the spiral curve is to the right. This screw is called a right screw if the direction of the spiral curve is Left-handed, this type of screw is called a left-handed screw. Left-handed screws are often used where they are subject to counterclockwise moments, because in this case right-handed The screws will loosen. It will not be fixed. In addition, the distance between two adjacent thread teeth is generally referred to as the pitch. The distance in the axial direction when the screw rotates one revolution is called the lead. For the general screw, the pitch and the lead are equal. This kind of screw is called a single thread screw. Next, I will summarize the names of the external thread screws and internal thread screws as follows. The size of each part has the inner diameter and the outer diameter. Generally speaking, the external thread screws use the outer diameter to indicate the size of the internal thread screws. The inner diameter indicates the size, which is generally expressed by the term of the nominal diameter (also referred to as the standard outer diameter after standardization) of the nominal diameter of the screw. In addition, the width of the screw groove is equal to the width of the thread. The diameter is called the effective diameter and is generally used to calculate the strength of the screw. The above description is based on the thread as an explanation of the screws. In fact, there are many differences between the ice dragon part of the screw and the part of the tip part. In general, the male screw is composed of a threaded shaft, a tip, a head, and a neck of the connector and the shaft. Shenzhen Shishitong screw manufacturer specializes in producing all kinds of fasteners such as screw fasteners, stainless steel screws, non-standard shaped screws, copper screws, titanium screws and screws. Screw custom hotline