DIN 7985 is a standard for cross recessed raised countersunk (oval) head machine screws. These screws are commonly used in mechanical and electronic applications, as they have a low profile head that allows them to sit flush with the surface of the material they are fastening. In this guide, we will provide a comprehensive overview of the dimensions and specifications of DIN 7985 screws.

Dimensions of DIN 7985 Screws

DIN 7985 screws are available in metric sizes ranging from M1.6 to M10, with lengths ranging from 3mm to 60mm. The head diameter is typically twice the nominal diameter of the screw, and the head height is approximately 1.5 times the nominal diameter. The thread pitch for these screws is typically coarse (standard) or fine, depending on the diameter of the screw.

Here are some of the key dimensions of DIN 7985 screws:

  • Nominal Diameter (d): This is the diameter of the screw measured across the threaded portion of the shaft. It typically ranges from M1.6 to M10.

  • Length (l): This is the overall length of the screw, including the head. It typically ranges from 3mm to 60mm.

  • Head Diameter (dk): This is the diameter of the head of the screw, measured across the widest point. It is typically twice the nominal diameter of the screw.

  • Head Height (k): This is the height of the head of the screw, measured from the surface of the material to the top of the head. It is typically approximately 1.5 times the nominal diameter of the screw.

  • Thread Pitch (P): This is the distance between the threads of the screw, measured from crest to crest. It can be coarse (standard) or fine, depending on the diameter of the screw.

Specifications of DIN 7985 Screws

In addition to their dimensions, DIN 7985 screws also have certain specifications that determine their performance and suitability for different applications. Some of the key specifications of these screws include:

  • Material: DIN 7985 screws can be made from a variety of materials, including steel, stainless steel, brass, and nylon. The material used will depend on the application and the environment in which the screw will be used.

  • Finish: DIN 7985 screws can be finished with a variety of coatings, including zinc plating, black oxide, and passivation. The finish is chosen based on the desired level of corrosion resistance and appearance.

  • Thread: The thread of DIN 7985 screws is typically a standard ISO metric thread with a 60° thread angle. The thread can be coarse (standard) or fine, depending on the diameter of the screw.

  • Tolerance: DIN 7985 screws have specific tolerances for their dimensions, including the diameter, length, and head dimensions. These tolerances ensure that the screws are manufactured to consistent and precise standards.

Applications of DIN 7985 Screws

DIN 7985 screws are used in a wide variety of applications, including:

  • Electronics: These screws are commonly used to fasten components and circuit boards in electronic devices.

  • Machinery: DIN 7985 screws are used in machinery applications to secure parts and components.

  • Automotive: These screws are used in automotive applications, such as securing panels and trim.

  • Furniture: DIN 7985 screws are also used in furniture applications, such as attaching hardware and fastening joints.

Here is a dimension chart for DIN 7985 screws:

Nominal Diameter (d) Thread Pitch (P) Head Diameter (dk) Head Height (k) Length (l)
M1.6 0.35 3.2 1.5 3-12
M2 0.4 4 2 3-16
M2.5 0.45 5 2.5 4-20
M3 0.5 6 3 4-25
M4 0.7 8 4 5-40
M5 0.8 10 5 6-50
M6 1.0 12 6 8-60
M8 1.25 16 8 10-80
M10 1.5 20 10 12-100

Note: All dimensions are in millimeters (mm).

The "Nominal Diameter (d)" refers to the diameter of the screw measured across the threaded portion of the shaft.

The "Thread Pitch (P)" is the distance between the threads of the screw, measured from crest to crest. It can be coarse (standard) or fine, depending on the diameter of the screw.

The "Head Diameter (dk)" is the diameter of the head of the screw, measured across the widest point.

The "Head Height (k)" is the height of the head of the screw, measured from the surface of the material to the top of the head.

The "Length (l)" is the overall length of the screw, including the head.

Conclusion

DIN 7985 screws are a versatile and reliable fastening solution that can be used in a variety of applications. They are available in a range of sizes, materials, and finishes, and their specifications ensure that they are manufactured to precise standards.

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