What is a nut? A nut is a nut that is screwed together with a bolt or screw to act as a part of the fastening, an original that all manufacturing machinery must use. There are many types of nuts, and we often have nuts of national standard, British standard, American standard and Japanese standard. According to different materials, nuts are divided into several major types: carbon steel, high-strength, stainless steel, and plastic steel. According to the country's different standards for product attributes, it is divided into ordinary, non-standard, (old) national standard, new national standard, American system, British system, and German standard. Different sizes, threads are not divided into different specifications. The general national standard and German standard are denoted by M (for example, M8, M16), and the US and English systems use fraction or # to indicate the specifications (such as 8#, 10#, 1/4, and 3/8). Currently, the largest nut production and distribution center in China -- Yongnian Hebei shop, the price is appropriate and the local logistics also extends in all directions, but nuts with high precision and high technical content are only the most reliable in some cities in the south.
The specifications of the nut are generally 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, etc. The common hex nut is widely used. The feature is that the fastening force is relatively large. The disadvantage is that there must be enough operating space during installation. You can use a loose-wrench or open-end wrench, or the spanners above the glasses wrench require a lot of space for operation. The woolen nut has a frictionless surface and prevents sparks. It is rarely used mechanically. Common hex nuts are used for normal screws.