A nut is a nut, a part that is screwed together with a bolt or screw for fastening, and is an original part that all production machinery must use. There are many kinds of nuts. Our common ones are national standard, British standard, American standard, and Japanese standard. Nuts are divided into carbon steel, high-strength, stainless steel, plastic steel and other major types according to different materials. According to the product attributes, the standard numbers corresponding to different countries are divided into ordinary, non-standard, (old) national standard, new national standard, American system, British system, German standard. The size is different, the thread is not equally divided into different specifications. Generally, the national standard and the German standard are represented by M (for example, M8, M16), while the US and British systems use fractions or # to represent specifications.

2. Nuts are parts that tightly connect mechanical equipment. They can be connected together through the inner thread, nuts and screws of the same specification. For example, the M4-0.7 nut can only be matched with the M4-0.7 screw (in the nut, M4 Means that the inner diameter of the nut is about 4mm, 0.7 means that the distance between the two threads is 0.7mm); the same is true for American products, for example, a 1/4-20 nut can only be matched with a 1/4-20 screw (1/4 Means that the inner diameter of the nut is approximately 0.25 inches, and 20 means that there are 20 teeth in each inch).

3. At present, the largest nut production and distribution center in China-Yongnian Hebei Shop, the price is reasonable and the local logistics is also available in all directions, but the high-precision, high-tech nuts are the most reliable in some southern cities. Talking about Yongnian's nuts are like small commodities in Yiwu, they are very famous!