Metric Sizes DIN 7991 A4 Stainless Steel Flat Socket Head

Metric Sizes DIN 7991 A4 Stainless Steel Flat Socket Head Cap Screw

Metric Sizes DIN 7991 A4 Stainless Steel Flat Socket Head Cap Screws are premium marine-grade fasteners engineered for maximum corrosion resistance, strength, and flush-mount performance. Manufactured to DIN 7991 standards, these screws feature a precision 90° countersunk flat head combined with an internal hex drive, delivering secure torque transfer and a smooth, low-profile surface finish.

Produced from A4 stainless steel (commonly equivalent to 316 stainless steel), these flat socket head cap screws are specifically designed for use in aggressive environments where moisture, salt, and chemicals are present.

Marine-Grade A4 Stainless Steel Performance

Superior Corrosion & Chemical Resistance

A4 stainless steel contains molybdenum, significantly enhancing resistance to chlorides, saltwater, and chemical exposure. This makes DIN 7991 A4 flat socket head screws ideal for marine construction, coastal installations, food processing facilities, wastewater systems, and chemical plants.

Long-Term Durability in Harsh Conditions

Unlike standard stainless grades, A4 stainless steel maintains structural integrity and appearance even in high-humidity or corrosive atmospheres, reducing maintenance and replacement costs.

DIN 7991 Countersunk Flat Head Design

Flush 90° Countersunk Profile

The flat head design allows the screw to sit flush within a properly machined countersink, creating a smooth surface free from protrusions. This is essential in equipment panels, decking, architectural metalwork, and fabricated assemblies where aesthetics and safety matter.

Internal Hex Drive for Controlled Installation

The socket drive ensures precise torque application while minimizing stripping or cam-out. This allows for consistent, secure fastening in critical metric assemblies.

Available Metric Sizes & Applications

Common metric sizes include M4, M5, M6, M8, M10, M12, and larger diameters with various lengths to meet specific clamping requirements.

Typical applications include:

• Marine hardware and dock systems

• Coastal construction projects

• Food and beverage processing equipment

• Pharmaceutical and chemical processing systems

• Outdoor architectural installations

Why Choose DIN 7991 A4 Stainless Flat Socket Head Screws?

When maximum corrosion resistance, flush mounting, and professional performance are required, Metric DIN 7991 A4 Stainless Steel Flat Socket Head Cap Screws deliver exceptional reliability in the most demanding environments.