What grade are stainless steel socket head cap screws?
The round head hexagon socket screw, also known as the hexagon socket bolt, cup head screw, and hexagon socket screw, has different names, but the meaning is the same. The commonly used hexagon socket head screws are 4.8, 8.8, 10.9, and 12.9. It is also called a hexagon socket screw, also called a hexagon socket bolt. Its head is a hexagon socket head and a cylindrical head. According to the material, there are stainless steel and iron. Stainless steel has stainless steel SUS202 hexagon socket head screws, which is a common stainless steel material. There are stainless steel SUS304 hexagon socket head screws and stainless steel SUS316 hexagon socket head screws. Iron is divided according to the strength grade of the hexagon socket head screw, including 4.8 hexagon socket head screws, 8.8 hexagon socket head screws, 10.9 hexagon socket head screws, and 12.9 hexagon socket head screws. 8.8-12.9 grade hexagon socket head screws are called high-strength and high-grade hexagon socket bolts.
Application scope and precautions of different strength grades of hexagon socket bolts
Hexagon socket bolts are a commonly used structural component. Different strength grades are suitable for different occasions. Correct selection and installation are the key to ensuring safe and reliable connections.
Grade 4.6 and 4.8 hexagon socket bolts are suitable for some joints with low requirements, such as furniture.
2. Grade 5.8 hexagon socket bolts are suitable for structures such as vehicles and machinery.
3. Grade 8.8 hexagon socket bolts are suitable for heavy-duty machinery and equipment, such as bridges, steel structures, large machinery, etc.
4. Grade 10.9 hexagon socket bolts are suitable for various heavy-duty machinery, such as excavators, cranes, trucks, etc.
5. Grade 12.9 hexagon socket bolts are suitable for structures with the highest requirements, such as high-speed trains, aircraft, nuclear power plants, etc. Its tensile strength is as high as 1200MPa, and its torsional moment strength is more than twice that of grades 10.9 and 8.8.
It should be noted that the higher the strength grade of the hexagon socket bolt is, the more suitable it is for all joints. For example, in some cases, a grade 4.8 hexagon socket bolt is sufficient to meet the requirements. When using it, it should be selected according to the actual situation and installed correctly according to the standard requirements.
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