ASME B18.3

ASME B18.3 is a standard developed by the American Society of Mechanical Engineers (ASME) that specifies the requirements for socket head cap screws. Socket head cap screws are high-strength fasteners commonly used in machinery and other applications that require precision and reliability.

The standard defines the dimensional requirements, material specifications, and testing procedures for socket head cap screws in both inch and metric sizes. ASME B18.3 ensures that these screws meet certain quality and performance standards, including strength, durability, and corrosion resistance.

Overall, ASME B18.3 is an important standard for manufacturers and engineers who work with socket head cap screws. It helps ensure the safety and reliability of machinery and other equipment that rely on these fasteners.

Uses of ASME B18.3

Socket head cap screws that conform to the ASME B18.3 standard are commonly used in a variety of applications, including:

  1. Machinery assembly: Socket head cap screws are often used to assemble machinery and equipment, where high strength and precision are required.
  2. Automotive applications: These screws are used in automotive applications, such as engine assembly and suspension systems, due to their high strength and reliability.
  3. Aerospace and aviation: Socket head cap screws that conform to ASME B18.3 are also used in the aerospace and aviation industries, where high strength and resistance to vibration are critical.
  4. Medical equipment: These fasteners are used in medical equipment and instruments, where precision and reliability are essential.
  5. Construction and building: Socket head cap screws are used in the construction and building industries, such as in steel fabrication and structural engineering applications.

Materials for DIN 912

List of materials that can be used to make ASME B18.3 socket head cap screws, grouped according to the material type:

  1. Steel:
  • Low carbon steel (ASTM A307, A325, A449, A490)
  • Medium carbon steel (ASTM A574, A574M)
  • Alloy steel (ASTM A193, A320)
  1. Stainless steel:
  • Austenitic stainless steels (ASTM F593)
  • Martensitic stainless steels (ASTM A276, A479)
  • Duplex stainless steels (ASTM A182)
  1. Non-ferrous metals:
  • Brass (ASTM B16)
  • Bronze (ASTM B98)
  1. Titanium:
  • Titanium alloys (ASTM F468)

Note that these are just some examples of materials that can be used to make ASME B18.3 socket head cap screws. The specific material used for a particular screw may depend on the application requirements and the manufacturer's specifications. It's important to consult the manufacturer's documentation or markings on the screw to determine the specific material used.


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