Firstly, the hexagon socket set screws are divided according to the shape: the top of the cylindrical end screw is a cylinder, the top of the hexagonal cone end screw is a cone, and the application of various shapes of the screw is also different:
1. The inner hexagon is called the screw, and the outer hexagon is called the bolt. In use, the hexagon socket screw is mostly used for screwing into the internal thread of the part. Most of the bolts are used for external links, and most of them are connected with the outer hexagon nut.
2, the hexagonal screw is beautiful, the nut has no directionality, unlike the hexagonal bolt. For example, there are multiple bolt heads on the table. If you do not unify the head direction, you will feel messy, and the inner hexagon will give People feel very neat.
3. In addition, the hexagon socket screws are mostly used in places where precision and stress are not too large, such as electromechanical equipment. Larger, more heavily loaded equipment, such as heavy machinery, metallurgical equipment, and large pressure machines, useless hexagonal screws. Of course, the use is not absolute. I have also seen some applications on coal excavators and large construction machinery, but only a little less.
4. Hexagon socket head bolts are divided into hexagonal head bolts according to the head. This is the most commonly used one, and it also has many types. It is divided into iron according to the material, that is, carbon steel and stainless steel. Stainless steel hexagon socket bolts are also available in stainless steel SUS304 and SUS202.
5, semi-circular head hex bolts, this also has the hex head bolts. Hexagon socket head cap screws, the head is flat, and the inside is hexagonal. There is also a class of national standards that are special, called headless hexagon socket bolts. Also known as the machine screw, pay the screws, set screws. These are the common names for headless hexagon socket bolts, but the meaning is the same. Of course, there are some bolts with flower-shaped hexagonal plum heads. This application is relatively rare, and it is basically difficult to see on the market.