DIN 908

DIN 908 is a standard specification published by the Deutsches Institut für Normung (DIN), which is the German Institute for Standardization. This standard defines the characteristics and dimensions of hexagon socket screw plugs made of steel and intended for use with threaded pipe connections.

The DIN 908 standard covers screw plugs with a male or female thread, and with a hexagon socket head for tightening or loosening. The standard specifies various dimensions such as the size of the plug, the thread type, the length of the threaded portion, and the width across flats of the hexagon socket head.

This standard is commonly used in industrial applications where pipes need to be closed or sealed. The DIN 908 standard helps ensure compatibility and interchangeability between different manufacturers' hexagon socket screw plugs.

Uses of DIN 908

Hexagon socket screw plugs with a male or female thread, and with a hexagon socket head for tightening or loosening, are commonly used in industrial applications where threaded pipe connections need to be closed or sealed. They have several uses, such as:

  1. Closing off pipes: They are used to close off pipes that are not in use or that need to be temporarily shut down for maintenance or repairs.

  2. Pressure testing: They can be used to seal off a section of pipe for pressure testing. This is often done during the installation of new piping systems or to check the integrity of existing systems.

  3. Preventing leaks: They can be used to prevent leaks from pipe connections that are not currently in use or that are being removed for maintenance or repairs.

  4. Chemical processing: They are commonly used in chemical processing applications where it is important to seal off piping connections to prevent the escape of hazardous chemicals.

  5. Water treatment: They are used in water treatment plants to close off pipes during routine maintenance and repairs.

  6. Oil and gas industry: They are used in the oil and gas industry to close off pipes during well drilling operations or to isolate sections of pipelines for maintenance and repairs.

Overall, these hexagon socket screw plugs are versatile components that are essential in a variety of industrial applications where threaded pipe connections need to be closed or sealed.

Materials for DIN 908

Similar to DIN 906, the DIN 908 standard does not specify the materials that must be used to make hexagon socket screw plugs. The selection of materials depends on the specific application requirements, and there are many different materials that can be used, each with different grades and specifications.

However, here are some of the commonly used materials and grades for hexagon socket screw plugs:


  • Carbon steel: ASTM A105

  • Stainless steel: ASTM A182 F304/F304L, ASTM A182 F316/F316L, ASTM A182 F321

  • Alloy steel: ASTM A182 F11, ASTM A182 F22, ASTM A182 F5


  • Free cutting brass: ASTM B16

  • Low lead brass: ASTM B584


  • Aluminum alloy: ASTM B211


  • Copper alloy: ASTM B75, ASTM B88


  • PVC: ASTM D1784
  • Nylon: ASTM D4066

It's important to note that the selection of material and grade for hexagon socket screw plugs must be based on the specific application requirements and the properties of the materials available. The above list is not exhaustive, and there may be other materials and grades that are suitable for different applications.


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