Non-standard screws are often used in daily life, and they are widely used in watch glasses, large trains, and space shuttles. Screws are an invention in people's production. According to the application field, it is also the pride of human beings. So what are the ways to use the screws:
The role of non-standard screws:
The main function of non-standard screws is to link the tools that fasten the parts, which can also be called special-shaped screws. There are a lot of screws that can be used without a nut when connecting. Of course, the basic non-standard screws that do not use the nut play a key role in the link mechanism.
Non-standard screw material:
Generally speaking, the material for manufacturing non-standard screws is high carbon steel, medium carbon steel, low carbon steel and other materials. The carbon content of carbon steel is distinguished from low carbon steel, medium carbon steel, high carbon steel and alloy steel. Low carbon steel C% ≤ 0.25% Domestically known as A3 steel. Foreign countries are basically called 1008, 1015, 1018, 1022 and so on. Mainly used for 4.8-class bolts, 4-level nuts, small screws and other products without hardness requirements. (Note: The drill tail nail mainly uses 1022 material.) Medium carbon steel 0.25% <C% ≤ 0.45% Domestically, it is called 35# and 45 steel, and foreign countries are basically called 1035, CH38F, 1039, 40ACR and so on. Mainly used for 8-grade nuts, 8.8-class bolts and 8.8-class hexagonal products. High carbon steel C%>0.45%. At present, alloy steel is basically not used on the market: alloy elements are added to the carbon steel to increase some special properties of the steel: 35, 40 chromium molybdenum, SCM435, 10B38.
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