Nut is the nut, bolt or screw rod together to play of the fastening parts, all production machinery manufacturing must use an original. Nuts are different, we common standard, British standard, American Standard, the standard, the nut. Nut according to different materials, divided into several major types of carbon steel, high strength, stainless steel, plastic and other. According to the product attributes corresponding to the countries of different standards, for ordinary, non - standard, (old) GB, the new national standard, American, British, German standard. Different sizes, thread is not equal for different specifications. General standard, German standard m (for example M8, M16), American, British, and with scores or no. specifications (such as No. 8, No. 10, 1 / 4, 3 / 8)2, nuts is to connect the machinery and equipment parts, through the inside of the thread, same specifications of nuts and bolts to connect together, for example M4-0.7 nut only with M4-0.7 screw collocation (the nut, M4 refers to the inner diameter of the nut is about 4mm, 0.7 refers to the distance between the two thread is 0.7mm); American made products also, for example 1 / 4-20 nut with only 1 / 4-20 screw collocation (1 / 4 refers to the inner diameter of the nut is about 0.25 inch, 20 to 20 teeth per inch).3, is currently the largest nut production and distribution center - Yongnian, Hebei shop, the right price and local logistics is also extending in all directions, but high precision, high technological content of nuts or southern cities only the most reliable. Talking about Yongnian nut like Yiwu is the same as the commodity, very famous!