Nuts are our common fastener products, used in conjunction with bolts, studs or other threaded workpieces for connection and tightening. Under normal circumstances, the strength of the bolts selected during design will be one level higher than that of the corresponding nuts. This can ensure that the life of the screws is longer than that of the nuts when used together. In this way, when disassembling and replacing the fasteners, the cost of replacing the nuts will be lower and more convenient. But are you familiar with the strength grades of nuts? Let’s find out together.

Strength grade of nuts

There are many types of nuts. Of course, nuts also have grades. Our commonly used carbon steel nuts are 4, 5, 6, 8, 9, and 10. , 12 and other seven performance levels. The higher the grade of the nut, the stronger it is. Different grades of nuts correspond to different grades of bolts, as shown in the figure below. (High-grade nuts can generally replace low-grade nuts).

How much force can the nut withstand

1. The minimum guaranteed load of an 8-grade M6 nut is a tensile force of 17200N

2. An 8-grade M6 nut The minimum guaranteed load of a grade M12 nut is a tensile force of 74200N

3. The minimum guaranteed load of a grade 10 M12 nut is a tensile force of 88500N

Uses of high-strength nuts

Nowadays, many power generation equipment and means of transportation such as airplanes, cars, trains, and ships are developing rapidly, so locking components such as our nuts also need to develop rapidly in line with the trend in order to keep up with the pace of development. . High-strength bolts are mainly used for the connection of some important mechanical equipment. In particular, repeated disassembly and assembly and various assembly methods place extremely high demands on nuts. The thread surface condition and accuracy will affect the use and safety of the equipment.

Generally, in order to adjust the friction coefficient and prevent rust and jamming during use, we generally require a layer of nickel phosphorus to be plated on the surface. The thickness of the coating is generally controlled in the range of 0.02~0.03mm, and the coating must be uniform, dense in structure, without pinholes, etc.

The process flow of high-strength nut nickel phosphorus plating consists of three parts. The first is pre-plating treatment, which mainly includes the accuracy and appearance inspection of high-strength nuts before plating to see if there are cracks or defects, etc. , oil stains can be removed manually, or by soaking, or by pickling, followed by processes such as using electricity to activate the nut and quickly nickel plating; then there is the chemical nickel plating process, which uses a series of chemical methods to coat the nut on the nut. Nickel plating, etc.; the last step is the post-processing process, which generally includes processes such as removing the heat caused by hydrogen, polishing, and inspection of the finished product.

The above is the relevant content about the strength grade of nuts. I hope it can be helpful to everyone! Nuts are nuts, which are parts screwed together with bolts or screws for tightening. All production and manufacturing A component that must be used in machinery can be divided into several types according to different materials: carbon steel, stainless steel, non-ferrous metals, etc. The working principle of the nut is to self-lock using the friction between the nut and the bolt. We often use nuts in our daily life. I hope my introduction can help readers.

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