Detalles del producto

These screws are meticulously engineered for superior strength, a flawless fit, and decades of reliable service in harsh conditions.

• DIN 7991 Countersunk Head: The screw features a flat-topped, conical head (typically 90 degrees) that is designed to sit perfectly within a pre-drilled countersunk hole. This allows the head to become completely flush with the material surface, creating a smooth, safe, and professional finish that prevents snagging and interference.
• Internal Hex Socket (Allen) Drive: The head is equipped with an internal hexagonal recess, allowing for high-torque installation with a standard hex key (Allen wrench). This secure drive system minimizes the risk of cam-out and protects the drive from external damage, which is especially important for coated fasteners.
• High-Strength Material Options: To meet diverse structural and load-bearing requirements, these bolts are available in a range of materials:
  • Carbon Steel & Alloy Steel: Available in high-tensile property classes including 8.8, 10.9, and 12.9 for demanding structural applications.
  • Stainless Steel: Offered in A2-70 and A4-70 grades for applications requiring inherent corrosion resistance in addition to strength.
• Superior Hot-Dip Galvanized (HDG) Coating: The defining feature of these bolts is their Hot-Dip Galvanized finish. This process involves immersing the fastener in a bath of molten zinc, creating a thick, durable, and metallurgically bonded coating.
  • Exceptional Corrosion Resistance: The thick zinc layer provides a robust barrier against rust and corrosion, far surpassing standard zinc plating. It is the industry standard for long-term outdoor and marine exposure.
  • Sacrificial Protection: The zinc coating sacrificially corrodes to protect the underlying steel, even if the surface is scratched or abraded.
  • Abrasion Resistance: The alloy layers formed during the galvanizing process create a tough finish that is highly resistant to mechanical damage.

Parámetros del producto

The technical specifications for our Handan HDG DIN 7991 Hex Socket Countersunk Head Cap Screws are detailed below.

Características del producto

These heavy-duty screws are engineered to deliver uncompromising performance in the toughest environments:

• Maximum Corrosion Protection: The thick Hot-Dip Galvanized coating provides decades of reliable protection against rust, making it ideal for outdoor, coastal, and industrial settings.
• Perfect Flush-Mount Finish: The DIN 7991 countersunk head ensures a smooth, non-protruding surface, enhancing safety and aesthetics in structural and architectural applications.
• High Tensile Strength: Available in high-strength grades (8.8, 10.9, 12.9), these bolts provide the clamping force and shear strength required for critical, load-bearing connections.
• Heavy-Duty Durability: The metallurgically bonded HDG coating is tough and abrasion-resistant, ensuring the fastener’s integrity during transport, handling, and installation.
• Secure High-Torque Installation: The internal hex drive allows for controlled and reliable tightening, ensuring optimal clamping force without damaging the protective coating.
• Sourced from a Fastener Hub: Manufactured in Handan, a global center for fastener production, ensuring quality, expertise, and competitive factory-direct supply.

Aplicaciones de los productos

The combination of a flush profile and extreme corrosion resistance makes these screws the premier choice for long-lasting structural applications:

• Construcción e infraestructuras: Ideal for steel structures, bridges, guardrails, and building facades where long-term durability is essential.
• Marine and Coastal Environments: Used in the construction of docks, piers, boat lifts, and on marine vessels exposed to saltwater spray.
• Automotive and Transportation: Perfect for chassis assembly, trailer frames, and heavy-duty vehicle attachments that face road salt and extreme weather.
• Industrial and Agricultural Equipment: Provides a secure and lasting fastening solution for heavy machinery, processing plants, and farm equipment exposed to the elements.
• Outdoor Structures: The best choice for assembling playgrounds, stadiums, communication towers, and architectural metalwork.