The three-combination screw is mostly used for the connection between thin metal plates to play a connection role. When connecting, first make the bottom hole of the connecting piece, and then screw the combination screw into the bottom hole of the connecting piece. Due to the high hardness of the thread surface of the combined screw, the internal thread can be screwed into the bottom hole of the screw to be connected to form a connection.

Hex Nut Manufacturers introduced that the triple screw can be sucked up with a magnet, but the stainless steel triple screw is difficult to suck up. Environmental protection triple combination screws and non-environmental protection screws are invisible to the naked eye, and require mechanical testing, and cannot be judged out of thin air with the naked eye. The specifications of the three combination screws need to be judged by the national standard, and the salt spray machine can be used to measure how many hours the salt spray of the triple screw takes.

The material of the triple screw: It is decided to test the material of the combined screw wire with a testing machine, which is divided into iron and stainless steel. Iron wire is divided into 1010 wire, 1018 wire, and 10B21 wire; stainless steel is divided into stainless steel 201, stainless steel 304, and stainless steel 316. The classification of triple screws is based on the material of the screw wire and the hardness index of the screw wire. Generally, the materials of the three combination screws are divided into stainless steel and iron, and iron can be divided into low carbon steel, medium carbon steel and high carbon steel. Carbon steel composite screws refer to iron composite screws, generally divided into 4.8, 8.8, 10.9 and 12.9 levels.

However, the 10.9 and 12.9 combination screws are rarely used in the market, and among the three combination screws on the market, the 4.8 and 8.8 combination screws are commonly used. Grade 4.8 combination screws are usually made of screws and steel wire piers 1010A. After the screws and the line piers are made into screws, they are assembled together with elastic flat washers. After this 4.8 grade combination screw is manufactured, it does not need to be hardened, and its hardness can reach 4.8. The 8.8 grade combination screw is made of threaded 10B21 piers. After the screw thread piers are made into screws, they can be equipped with elastic pads and flat pads to combine three Rub the teeth together so that the elastic flat pad can be fastened to the screw, and the elastic flat pad will not fall off. After the combination screw is produced, it needs to be hardened to make its hardness reach 8.8, and then we need to electroplate it, in order to prevent the spring pad in the combination screw with a hardness of 8.8 from becoming brittle and easy to break. In this way, the hardened combined screw must be dehydrogenated, and then electroplating can be performed after dehydrogenation.

Through the above introduction, 2h Hex Nut Manufacturers hopes that you can simply refer to the content of this article in future use.

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