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How many types of screw grades are there?

There are several grades of screws categorized according to different standards such as ISO, ASTM, and SAE. Each standard specifies screw grades based on their strength and properties. Generally, screw grades can be classified into the following main types:

1. Grade 4.6

• Low Strength : Used in general applications that do not require high load-bearing capacity, such as woodworking or tasks requiring flexibility.
• Material Used : Low Carbon Steel

2. Grade 8.8

• Medium to High Strength : Used in general structural applications requiring strength and durability, such as machinery or steel structures.
• Material Used : Medium Carbon Steel or Alloy Steel

3. Grade 10.9

• High Strength : Used in applications that require high tensile strength, such as in the automotive industry or heavy machinery.
• Material Used : Medium Carbon Steel with Heat Treatment

4. Grade 12.9

• Very High Strength : Used in applications that require high safety and load-bearing capacity, such as heavy industry or assembling components that need high stability.
• Material Used : Alloy Steel with Heat Treatment

5. Stainless Steel Grades (e.g., A2, A4)

• Corrosion Resistance : Used in environments requiring resistance to moisture or chemicals.
• Material Used : Various grades of stainless steel, such as A2 (304 Stainless Steel) or A4 (316 Stainless Steel)

The choice of material for manufacturing screws depends on the application and the specific requirements of the task. If high strength is needed, appropriate steel with properties that match the application should be used, often with heat treatment to enhance strength. For applications requiring corrosion resistance, the appropriate grade of stainless steel should be selected according to the environmental conditions.