Product Details
These screws are engineered for a precise fit, reliable performance, and a clean appearance.
- DIN 7991 Countersunk Head: The screw features a flat-topped, conical head (typically with a 90-degree angle) manufactured to precise DIN 7991 specifications. It is designed to fit into a pre-drilled countersunk hole, allowing the head to sit completely flush with or below the surface of the workpiece for a smooth, snag-free finish.
- Internal Hex Socket (Allen) Drive: The head is equipped with a deep, crisp internal hexagonal recess, designed for use with a standard hex key (Allen wrench). This drive system allows for high-torque application, minimizes the risk of cam-out, and provides a secure grip for easy installation and removal.
- High-Strength Carbon Steel: Forged from quality carbon steel, these screws are available in a range of property classes to handle different load requirements:
- Grade 4.8: Standard strength for general-purpose, low-load applications.
- Grade 8.8: High-tensile steel suitable for most industrial, automotive, and structural applications.
- Grade 10.9 & 12.9: Very high-strength steels for critical, high-stress assemblies that demand maximum clamping force and load-bearing capacity.
- White/Blue Zinc Plating (Clear Zinc): These screws are coated with a bright White/Blue Zinc Plating. This electro-galvanized finish consists of a layer of zinc with a clear (or slightly blue-tinted) chromate passivation sealant. It provides effective corrosion resistance for indoor and mild-environment applications, along with a clean, bright, and slightly iridescent silver-blue appearance that is both protective and aesthetically pleasing.
Product Parameters
The technical specifications for our DIN 7991 White/Blue Zinc Plated Hex Socket Countersunk Head Cap Screws are detailed below.
| Parameter | Specification |
|---|
| Product Name | CSK Flat Head Hex Socket Bolts DIN7991 |
| Standard | DIN 7991 |
| Material | Carbon Steel |
| Property Class / Grade | 4.8, 8.8, 10.9, 12.9 |
| Surface Treatment | White/Blue Zinc Plated (Clear Zinc) |
| Head Style | Countersunk (CSK) / Flat Head |
| Drive Style | Internal Hex Socket (Allen) |
| Diameter Range | M3 – M16 |
| Brand Name | Duojia |
| Place of Origin | Hebei, China |
| Key Feature | Flush-mount design with a bright, corrosion-resistant finish |
| Application | Furniture, Electronics, Machinery, Heavy & General Industry |
Product Features
These high-performance screws are engineered to deliver a superior finish and dependable performance:
- Perfectly Flush and Smooth Surface: The countersunk head design allows the screw to sit level with the material, creating a smooth, professional, and safe surface with no protrusions.
- Reliable Corrosion Protection: The White/Blue Zinc plating offers good resistance to rust and corrosion, making it a dependable choice for a wide range of indoor and general-purpose applications.
- High Strength for Demanding Loads: Available in high-tensile grades (8.8, 10.9, 12.9), these screws provide the strength and clamping force required for load-bearing and critical joints.
- Clean and Bright Aesthetic: The clear zinc finish provides a bright, professional appearance that complements a variety of materials and designs.
- Secure, High-Torque Fastening: The internal hex socket ensures a non-slip grip, allowing for controlled and reliable tightening to achieve optimal clamping force.
- Cost-Effective and Versatile: Zinc plating provides a highly effective and economical solution for corrosion protection, making these screws a versatile staple for countless projects.
Product Applications
The combination of a flush profile and a bright, protective finish makes these screws a popular choice across many industries:
- Furniture Assembly and Cabinetry: Widely used for creating strong, invisible joints in wood and composite materials, ensuring a clean and high-end look.
- Electronics and Appliances: Ideal for securing casings, panels, and internal components where a smooth exterior surface is required.
- Machinery and Equipment: Used for attaching panels, guards, and plates where a non-protruding fastener is necessary to avoid interference with moving parts.
- Architectural Metalwork and Interior Design: Perfect for installing fixtures, brackets, and decorative elements where fasteners must be strong yet discreet.
- General Manufacturing and Prototyping: A versatile and reliable fastener for a wide array of assembly and fabrication projects in workshops and factories.
