Release time：2020-01-16 18:44 Browse：
In the industrial field and daily life, lengthening screws have a wide range of applications. The hardness level of the screw is one of the important factors that determine its performance and application scenarios.
The hardness level of extension screws is usually divided by Rockwell hardness (HRC), Brinell hardness (HBW) and other indicators. Generally speaking, it can be divided into the following levels:
A, low hardness grade
Low hardness grade extension screws, hardness is usually below HRC30. This kind of screw is characterized by low hardness and good toughness. They are suitable for some occasions where the hardness is not high, but a certain toughness is required. For example, in the connection of wood materials, low hardness extension screws can avoid excessive damage to the wood, but also provide sufficient connection strength. In addition, in some decorative applications, low hardness screws can be more easily machined and installed without causing scratches or damage to the material being joined.
Second, medium hardness grade
Medium hardness grade extension screws, hardness is generally between HRC30-HRC45. This kind of screw has a good comprehensive performance, both with a certain hardness, can withstand a larger load, and has a certain toughness, not easy to break. Medium hardness lengthening screws are widely used in the connection of mechanical equipment, automobile manufacturing, building structure and other fields. In mechanical equipment, they can be used to connect various components to ensure the normal operation of the equipment. In automotive manufacturing, medium hardness extension screws can be used to connect important components such as the body and engine. In building structures, they can be used to connect steel structures, concrete structures, etc., to provide reliable connection strength.
Third, high hardness level
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