DIN 439-A

DIN 439-A is a German standard that specifies the dimensions and technical requirements for hexagon thin nuts with metric coarse and fine pitch thread. This standard applies to nuts with a height approximately half of the nominal diameter and a width across flats corresponding to the standard dimensions for hexagon bolts.

The DIN 439-A standard is commonly used in mechanical and engineering applications, where fastening with a nut and bolt is required. The dimensions and technical requirements outlined in the standard ensure that the nuts are compatible with other components in the system and provide reliable and secure fastening.

Overall, DIN 439-A is a standard that helps to ensure consistent quality and compatibility of hexagon thin nuts in metric coarse and fine pitch thread applications.

Uses of DIN 439-A

1. Machinery: These nuts are often used to fasten various components of machinery together, including gears, bearings, and pulleys.
2. Manufacturing: DIN 439-A nuts can be used in the manufacturing process for fastening parts together, such as in assembly lines.
3. Plumbing: These nuts are used in plumbing applications to secure pipes, fittings, and fixtures together.
4. Aerospace: DIN 439-A nuts are commonly used in the aerospace industry to fasten components together, such as in the assembly of aircraft engines.
5. Marine: These nuts are used in marine applications to secure components such as boat engines, rigging, and other parts.

Overall, DIN 439-A hexagon thin nuts with metric coarse and fine pitch thread are versatile fasteners that can be used in a wide range of industries and applications where secure fastening is necessary.

Materials for DIN 439-A

DIN 439 is a standard specification for hexagon thin nuts with metric coarse and fine pitch thread. The standard applies to nuts made from a variety of materials. Here is a list of material standards that are commonly used to make DIN 439 nuts, along with some examples of specific materials and grades:

1. Steel:

• ANSI/ASME B18.2.2: This standard covers the dimensions and material requirements for steel hex nuts. Some common grades of steel used to make DIN 439 nuts include:
  • Grade 2: low carbon steel
  • Grade 5: medium carbon steel
  • Grade 8: medium carbon alloy steel
• ASTM A563: This specification covers the chemical and mechanical requirements for carbon and alloy steel nuts.

2. Stainless Steel:

• ANSI/ASME B18.2.2: This standard also covers the dimensions and material requirements for stainless steel hex nuts. Some common grades of stainless steel used to make DIN 439 nuts include:
  • 18-8: austenitic stainless steel (e.g. AISI 304)
  • A2-70: austenitic stainless steel with a minimum tensile strength of 700 MPa
• ASTM A194: This specification covers the chemical and mechanical requirements for stainless steel nuts used in high-pressure and high-temperature applications.

3. Brass:

• ANSI/ASME B18.2.2: This standard also covers the dimensions and material requirements for brass hex nuts. Some common grades of brass used to make DIN 439 nuts include:
  • Grade 2: copper-zinc alloy (also known as "yellow brass")
  • Grade 5: copper-zinc-tin alloy (also known as "red brass")
• ASTM B633: This specification covers the requirements for electroplated coatings of zinc on brass and other metals.

DIN 439-A vs DIN 439-B

Note that the above list is not exhaustive, and there may be other material standards and grades that can be used to make DIN 439 nuts. It is important to select the appropriate material and grade based on the specific application and requirements.

1. Material:

• DIN 439-A covers hexagon thin nuts with metric coarse and fine pitch thread made of stainless steel.
• DIN 439-B covers hexagon thin nuts with metric coarse and fine pitch thread made of steel.

2. Chamfer:

• DIN 439-A does not have a specific requirement for chamfer.
• DIN 439-B specifies a chamfer requirement of 30 degrees angle and a maximum width of 0.8 times the nominal diameter.

3. Thread engagement:

• DIN 439-A specifies a minimum thread engagement length, while DIN 439-B does not.

4. Height:

• DIN 439-A specifies a minimum height of the nut, while DIN 439-B does not.

5. Width across flats:

• DIN 439-A specifies a maximum width across flats tolerance.
• DIN 439-B specifies a minimum width across flats tolerance.

Overall, DIN 439-A and DIN 439-B have different requirements for hexagon thin nuts with metric coarse and fine pitch thread, depending on the material used. DIN 439-B has a specific requirement for chamfer, while DIN 439-A does not. The two standards also differ in terms of their requirements for thread engagement, height, and width across flats. Therefore, it is important to select the appropriate standard and material based on the specific application and requirements.