Longze Wafer Head Self-Drilling Screws, also recognized as Modified Truss Head Screws, are engineered for high-precision fastening across demanding industrial environments. Manufactured in strict accordance with DIN 7504, ISO 15480, and ASME B18.6.4 standards, these fasteners are the ideal solution for metal-to-metal framing, HVAC ductwork, and electrical box mounting where stability and a low-profile finish are critical.
By integrating an ultra-wide bearing surface with a high-performance drill-point tip, Longze screws eliminate the need for pre-drilling. This innovative design prevents material pull-through in thin-gauge substrates while ensuring a rapid, single-operation installation that significantly reduces labor costs and assembly time in large-scale construction and automotive projects.
Detailed Parameters
| Compliance Standards | DIN 7504 / ISO 15480 / ASME B18.6.4 / SAE J78 | Metric Size Range | ST3.5 to ST6.3 |
|---|---|---|---|
| Inch Size Range | #6 to #14 | Length Range | 13 mm to 100 mm (1/2" to 4") |
| Drill Point Types | Point #2 (Standard) / Point #3 (Heavy Duty) | Drive Options | Phillips #2, Square, Torx (Star) |
| Material Grades | Hardened Carbon Steel C1022A / SS410 / Bi-Metal (SS304+Steel) | Surface Finishes | Zinc Plated, Black Phosphate, Ruspert, Passivated |
| Max Drilling (Steel) | Up to 6.0 mm (depending on size ST6.3) | Core Hardness | 240 HV to 450 HV (depending on material) |
Key Advantages
Anti-Pull-Through Design
The extra-wide wafer head distributes clamping force over a larger area, preventing deformation of thin-gauge metal and vinyl siding.
High-Speed Installation
Precision engineered drill points penetrate cold-rolled steel and aluminum in seconds, eliminating separate pilot holes.
Low-Profile Aesthetic
A thin, flat-topped head provides a professional, sleek finish that does not interfere with secondary layers or moving parts.
Superior Drive Torque
Deep Phillips #2 or Torx recesses ensure maximum driver engagement and prevent cam-out and surface scratching.
Diverse Coating Options
From Zinc Plating for indoor use to Ruspert for outdoor cladding, we provide specialized corrosion resistance for every environment.
Industrial Compliance
ISO 9001 certified production ensuring every batch meets strict torsional strength and drilling time benchmarks.
Product Gallery
Management Platforms
Automated Inspection
State-of-the-art automated thread and drill-point inspection systems for zero-defect shipments.
Torsional Testing
Rigorous head-to-shank junction testing to withstand high torque from power nut setters.
Drilling Verification
Random batch testing to ensure standard steel plate penetration in under 3 seconds.
Quality Assurance
ISO 9001 certified management ensures consistent mechanical properties and material purity.
Global Logistics
Fumigation-free pallets and export-ready 25kg cartons for seamless international shipping.
Custom Packaging
Flexible options including bulk cartons, plastic pails, or retail-ready boxes of 500-1000 pcs.
Investment Return Comparison
| Performance Metric | Standard Screws | Longze Wafer Head |
|---|---|---|
| Installation Speed | Requires Pilot Hole | Single-Step Drilling |
| Material Grip | High Pull-Through Risk | Maximum Bearing Surface |
| Labor Cost | High (Two-Step Process) | Low (Rapid Operation) |
| Surface Finish | Bulky Truss Head | Sleek Low-Profile |
| Durability | Standard Coating | Advanced Ruspert/Passivated |
Frequently Asked Questions
A Wafer Head is significantly thinner and flatter than a standard Truss Head. This makes it the superior choice for applications requiring a flush-mount feel without the need for a countersunk hole.
Yes, they can be used, but ensure the wood thickness does not exceed the drill point length. For very thick wood-to-metal applications, we recommend our specialized "Wing-Tip" screws to prevent clogging.
We recommend a power driver speed between 1,500 and 2,500 RPM. Excessively high speeds may burn out the drill point before it fully penetrates the metal substrate.
For outdoor HVAC and cladding, Ruspert ceramic coating is highly recommended as it provides salt spray resistance between 500 to 1000 hours, significantly outperforming standard zinc plating.
Ensure the drill point length is greater than the total thickness of the materials being joined. Reduce pressure once the threads engage to avoid over-tightening and stripping the hole.
Our production facility is ISO 9001 certified, and our products are manufactured to meet international standards including DIN 7504, ISO 15480, and ASME B18.6.4.
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