Metric Sizes Class 12.9 DIN 7991 Clear Cr3 Zinc Flat Socket Head

Metric Sizes Class 12.9 DIN 7991 Clear Cr3 Zinc Flat Socket Head Cap Screw

Metric Sizes Class 12.9 DIN 7991 Clear Cr3 Zinc Flat Socket Head Cap Screws are high-strength, precision fasteners engineered for flush-mount installations and demanding mechanical assemblies. Manufactured to DIN 7991 specifications, these countersunk socket head cap screws feature a 90° flat head and internal hex drive, delivering superior torque control, clean aesthetics, and exceptional clamping force in industrial environments.

Built from heat-treated alloy steel, Class 12.9 screws provide outstanding tensile strength and reliability for critical applications requiring maximum load performance.

Class 12.9 High-Strength Alloy Steel Performance

Exceptional Tensile Strength & Load Capacity

Class 12.9 metric fasteners offer a minimum tensile strength of approximately 1,220 MPa, making them ideal for high-stress assemblies. Compared to lower property classes such as 8.8 or 10.9, these screws provide greater resistance to shear forces and vibration, ensuring secure fastening in dynamic systems.

Precision DIN 7991 Countersunk Head

The flat 90° countersunk head allows the screw to sit flush within a machined countersink, creating a smooth surface profile. This design is ideal for applications where protruding hardware is not acceptable, such as tooling plates, machinery guards, automotive panels, and structural fabrications.

Clear Cr3 Zinc Plating Advantages

Corrosion Protection with Environmental Compliance

Clear Cr3 (trivalent chromium) zinc plating provides corrosion resistance while meeting modern environmental standards. The bright finish enhances appearance and protects against rust in indoor and light outdoor environments.

Consistent Thread Fit & Finish

The thin, uniform zinc coating maintains precise thread tolerances, ensuring proper engagement and reliable torque performance in metric assemblies.

Available Metric Sizes & Applications

Common metric diameters include M4, M5, M6, M8, M10, and M12, with multiple length options to meet various clamping requirements.

These fasteners are widely used in:

• Industrial machinery

• Automotive and performance equipment

• Automation systems

• Equipment manufacturing

• Structural steel fabrication

Why Choose Class 12.9 DIN 7991 Clear Cr3 Zinc Screws?

When you need high tensile strength, flush mounting, and dependable corrosion resistance, Metric Class 12.9 DIN 7991 Clear Cr3 Zinc Flat Socket Head Cap Screws deliver superior performance and long-lasting reliability in precision-engineered applications.