DIN 439-B

DIN 439-B is a German Industrial Standard that specifies the requirements for hexagon thin nuts with metric coarse and fine-pitch thread made of steel. This standard provides guidelines for the dimensions, tolerances, markings, and testing of these nuts. Adhering to DIN 439-B ensures that the nuts are manufactured to the necessary quality and safety standards, making them reliable for use in various industries

Uses of DIN 439-B

Hexagon thin nuts with metric coarse and fine pitch thread made of steel, as specified by DIN 439-B, are commonly used in various applications, including:

1. Machinery: They are often used in machinery and equipment manufacturing, where they serve as fasteners for bolts and other components.
2. Automotive: These nuts are used in the automotive industry as well, specifically for applications where a low-profile, lightweight nut is required.
3. Construction: They are commonly used in construction applications, such as in the assembly of steel structures, steel framing, and other similar applications.
4. Industrial: They are used in a variety of industrial applications, including aerospace, marine, and electrical industries.

In summary, hexagon thin nuts with metric coarse and fine pitch thread made of steel, as specified by DIN 439-B, are commonly used in various industries and applications where a low-profile, lightweight nut made of steel is required.

Materials for DIN 439-B

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.

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.

DIN 439-A VS DIN 439-B

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.