1, the nut is nuts, bolts or screw and screw together for fastening parts, an element of all manufacturing machinery must be used. There are many kinds of nuts, our common standard, German standard, British standard, Japanese standard. American Standard, nut nut of different materials, is divided into several types of carbon steel, high strength steel, stainless steel, etc. according to the standard number of product attributes corresponding to different countries are divided into general, non-standard, (old), the new national standard GB, American, British, German standard. The size is different, the thread is not divided into different specifications. The general standard, German standard M (e.g. M8, M16), American, British, scores or # said specifications (such as 8#, 10#, 1/4, 3/8)
2, the nut is connected to mechanical equipment parts, through the inside of the thread, the same specifications of nuts and bolts, can be connected together, such as screw nut only with the M4-0.7 of the M4-0.7 collocation (in the nut, M4 nut diameter is about 4mm, 0.7 fingers between the two thread distance of 0.7mm); US made products as well, such as screw nut only with the 1/4-20 1/4-20's collocation (1/4 refers to the nut inner diameter is about 0.25 inches, 20 inches each, 20 teeth).