DIN 7991 is a standard that specifies the dimensions and requirements for hexagon socket countersunk head screws. These screws are designed to sit flush or below the surface of the material, providing a smooth and even finish. They are commonly used in applications where aesthetics, space-saving, and a secure fastening solution are essential.
Key Features
✅ Hexagon Socket Drive
- Designed for use with Allen keys or hex wrenches.
- Provides better torque transmission and reduces the risk of slippage.
✅ Countersunk Head Design
- Ensures a flat surface after installation, preventing obstructions.
- Ideal for applications requiring aerodynamic efficiency or aesthetic appeal.
✅ Material Options
- Carbon Steel (for standard industrial use).
- Stainless Steel (for corrosion resistance).
- Alloy Steel (for high-strength applications).
- Additional coatings (e.g., zinc plating, black oxide) can be applied for enhanced protection.
✅ Industry Applications
- Automotive – Used in body panels, chassis components, and engine parts.
- Electronics – Secures components in devices while maintaining a sleek profile.
- Aerospace – Used in aircraft and spacecraft where weight and aerodynamics matter.
- Machinery & Robotics – Provides reliable fastening without protruding parts.
DIN 7991 Standard Specifications
| Property | Specification |
|---|---|
| Head Type | Countersunk (Flat) |
| Drive Type | Hexagon Socket |
| Thread Type | Metric (Coarse & Fine) |
| Strength Classes | 8.8, 10.9, 12.9 (for alloy steel) |
| Surface Treatment | Zinc-plated, Black oxide, Phosphate, etc. |
Advantages of DIN 7991 Screws
✔ Space-Saving – No protruding head ensures a flush fit.
✔ Aesthetic Appeal – Provides a clean and professional look.
✔ High Strength – Suitable for high-load applications.
✔ Corrosion Resistance – Available in stainless steel and coated variants.
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