Hexagonal Flange SelfTapping Screws China Factory and Suppliers | DIN 6928 ISO 1479
Longze Hexagonal Flange Self-Tapping Screws are high-performance industrial fasteners engineered to DIN 6928, ISO 1479, and ASME B18.6.3 standards. These precision-engineered screws feature an integrated circular flange head and hardened threads designed to cut their own mating paths in pre-drilled holes, providing exceptional clamping force and a superior bearing surface for thin-gauge materials.
Designed for maximum efficiency in industrial assembly lines, these flange tappers eliminate the need for separate washers, reducing assembly time and preventing pull-through in fragile substrates. Whether utilized in HVAC ducting, automotive bodywork, or structural steel panels, Longze screws ensure a vibration-resistant, secure fit across diverse metal, plastic, and wood substrates.
Detailed Parameters
| Technical Standards | DIN 6928, ISO 1479, ASME B18.6.3 | Metric Size Range | ST2.9 to ST9.5 |
|---|---|---|---|
| Inch Size Range | #4 to 3/8" | Thread Types | Type A, Type AB (Pointed), Type B (Blunt) |
| Available Materials | Case-Hardened Carbon Steel, SS304, SS316 | Surface Finishes | Zinc Plated, Yellow Zinc, Ruspert, Dacromet |
| Drive Type | External Hexagonal (High-Torque) | Surface Hardness | HV 450 min (Carbon Steel) to HV 550 min (Alloy) |
| Certification | ISO 9001 Certified Production | Packaging | 25kg Export Cartons / Fumigation-Free Pallets |
Key Advantages
Integrated Washer
Built-in flange distributes load evenly, removing the need for separate washers and preventing pull-through in thin sheets.
Rapid Installation
The high-torque hex drive ensures stable power driving, reducing cam-out and increasing assembly line speed.
Case-Hardened Edge
Heat-treated surface hardness allows threads to cut through structural steel and aluminum without deformation.
Vibration Resistant
Precision-engineered self-forming threads create a tight, secure fit that resists loosening in high-vibration environments.
Versatile Coatings
From Zinc to Ruspert, we provide specialized coatings to match specific salt spray requirements and environments.
Global Compatibility
Full support for both Metric (DIN/ISO) and Imperial (ASME) standards for seamless international procurement.
Product Gallery
Management Platforms
Material Control
Strict raw material sourcing and hardness testing to ensure tensile strength and ductility.
Precision Manufacturing
ISO 9001 certified processes ensuring consistent thread pitch and sharp point geometry.
Hydrogen Relief
Post-plating baking process for all hardened screws to eliminate hydrogen embrittlement risk.
Coating Validation
Rigorous salt spray testing to verify corrosion resistance across different environmental grades.
Logistics Optimization
Export-ready packaging in 25kg bulk cartons on fumigation-free pallets for safe transit.
Technical Support
Expert guidance on pilot hole sizing and driver RPM to optimize installation performance.
Investment Return Comparison
| Coating Type | Salt Spray Resistance | Recommended Environment |
|---|---|---|
| Zinc Plated | 72 - 144h | Indoor / Dry Panels |
| Yellow Zinc | 96 - 168h | Industrial Machinery |
| Ruspert | 500 - 1000h | Outdoor Construction |
| Passivated (SS) | 1000h+ | Marine / Medical |
| Dacromet | High Grade | Heavy Industrial |
Frequently Asked Questions
Longze self-tapping screws (DIN 6928) require a pre-drilled pilot hole to function. In contrast, self-drilling screws feature a built-in drill point that eliminates the need for pre-drilling.
Yes, because they are case-hardened, they easily tap into aluminum. For outdoor aluminum use, we recommend Stainless Steel versions to prevent galvanic corrosion.
We provide a detailed drill-size chart. A hole too small may cause the screw to snap, while a hole too large will prevent the threads from gripping securely.
These are designed for thin-gauge metal. For steel thicker than 5mm, we recommend switching to our Self-Drilling (TEK) series for better penetration.
Zinc plating can introduce hydrogen into the steel. Longze uses a specialized baking process to remove this hydrogen, preventing sudden brittle failure under load.
For outdoor construction and roofing, Ruspert or Dacromet coatings are recommended due to their high salt spray resistance (500-1000h+).
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