A nut is a nut, the part that is screwed in with a bolt or screw to hold it together. There are many kinds of nuts, we commonly have national standard, German standard, British standard, American standard, standard nuts. Nuts are divided into carbon steel, high-strength stainless steel, plastic steel and other types according to different materials. According to the product attributes corresponding to different national standards, they are divided into common, non-standard, (old) national standard, new national standard, American, British and German standards. Different thread sizes are divided into different specifications. -general gb and German specifications are represented by M (e.g. M8, M16), while us and British specifications are represented by scores or # (e.g. 8#, 10#, 1/4, 3/8).
A nut is a part that connects mechanical equipment closely together. It can only be connected together through the inside thread, nut and screw of the same specification. For example, the nut of m4-0.7 can only be matched with the screw of m4-0.7 (in the nut, the inner diameter of M4 refers to the nut is about 4mm, and the distance between the two thread teeth refers to 0.7 mm). The same is true for American products, such as 1/4-20 nuts that can only be matched with 1/4-20 bolts (1/4 means the nut is approximately 0.25 inch in diameter, and 20 means that there are 20 teeth per inch).