Bolt & Nut
According to the properties of nuts, there are national standard (GB), German standard (DIN), international standard (ISO), Japanese standard (JIS), American Standard (ASTM / ANSI) and other standards. Among them, national standard, German standard and Japanese standard are represented by M (for example, M8, M16), American system and English system are represented by score or × (for example, 8 × ۱۰ × ۱۰, ۱ / ۴, ۳ / ۸). Nuts which are screwed together with bolts or screws to play a tightening role. According to different materials, all production and manufacturing machinery must use a component, which is divided into carbon steel, stainless steel, non-ferrous metals (such as copper), etc.
These three materials are introduced in detail below:
(I) carbon steel
We distinguish low carbon steel, medium carbon steel, high carbon steel and alloy steel by carbon content in carbon steel. ۱. Low carbon steel
C% ≤ ۰.۲۵% is commonly referred to as A3 steel in China. Foreign countries are basically called 1008101510181022, etc. It is mainly used for grade 4.8 nuts, grade 4 nuts, small screws and other products without hardness requirements. (Note: 1022 material is mainly used for drilling tail nail. ) ۲. Medium carbon steel C%: 0.25% – ۰.۴۵%.
At present, alloy steel is not used in the market. 4. Alloy steel: add alloy elements to ordinary carbon steel to increase some special properties of steel: such as 35,
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