Black Phosphated Drywall Screws China Factory Suppliers DIN 181822 ASTM C1002
Longze Black Phosphated Drywall Screws are professional-grade fasteners engineered to DIN 18182-2 and ASTM C1002 standards, providing superior security for gypsum boards attached to metal studs or wood framing. Designed with a precision bugle head and Phillips drive, these screws penetrate substrates rapidly while ensuring the protective paper face of the drywall remains intact for a seamless finish.
Featuring a specialized black phosphate chemical coating, these screws offer an ideal surface for joint compound and paint adhesion, significantly reducing the time required for plastering. Whether you are working on residential partitions or commercial acoustic insulation, Longze delivers the perfect balance of high-tensile strength and installation efficiency to ensure maximum structural integrity.
Detailed Parameters
| Compliance Standards | DIN 18182-2 / ASTM C1002 / EN 14566 | Material Grade | High-Tensile Case-Hardened Carbon Steel |
|---|---|---|---|
| Diameter Range | 3.5mm to 4.8mm (#6 to #10) | Length Range | 13mm to 150mm (1/2" to 6") |
| Drive Type | Phillips #2 (Cross Recess) | Head Style | Bugle Head (Countersunk) |
| Surface Finish | Black Phosphate / Grey Phosphate | Thread Options | Fine Thread / Coarse Thread |
| Point Type | Sharp Needle Point / S-Point | Weight (3.5mm/25mm) | Approx. 1.30 kg/1000pcs |
Key Advantages
Paper-Safe Bugle Head
The curved head allows screws to sink perfectly below the surface without tearing the drywall paper, ensuring maximum holding power.
Rapid Penetration
Sharp needle points allow for immediate "bite" and one-handed installation, drastically increasing productivity on ceilings and high walls.
Optimized Adhesion
The porous black phosphate coating provides a superior bonding base for drywall mud and paint compared to smooth zinc plating.
Anti-Cam-Out Design
Standardized Phillips #2 recess depth ensures the driver bit seats securely, preventing head shearing and stripping during high-speed driving.
High Tensile Strength
Case-hardened carbon steel prevents snapping when penetrating dense metal tracks or structural steel studs.
Versatile Threading
Available in Fine Thread for light-gauge metal (≤ 0.88mm) and Coarse Thread for timber framing to suit any substrate.
Product Gallery
Management Platforms
ISO 9001 Quality Control
Automated thread-sharpness testing ensures every batch meets rigorous international standards.
Drilling Speed Test
Verified penetration of 0.6mm steel in under 1 second for Fine Thread variants.
Salt Spray Testing
Strict corrosion resistance verification for standard interior humidity environments.
OEM Customization
Flexible retail packaging (500-1000 pcs) with custom branding available for distributors.
Export Logistics
Bulk 25kg export cartons shipped on fumigation-free pallets for global transit.
Technical Support
Expert recommendations on thread selection and substrate thickness for maximum grip.
Investment Return Comparison
| Feature Comparison | Standard Zinc Screws | Longze Black Phosphate |
|---|---|---|
| Joint Compound Bond | Low (Smooth Surface) | High (Porous Coating) |
| Installation Speed | Moderate | Rapid (Needle Point) |
| Surface Finish | Visible / Reflective | Matte / Paint-Ready |
| Paper Tear Risk | Higher | Minimal (Bugle Head) |
| Cost Efficiency | Low (More Mud/Sanding) | High (Faster Finishing) |
Frequently Asked Questions
The black phosphate coating creates a porous surface that allows drywall joint compound (mud) and paint to bond much more effectively than smooth zinc plating, preventing paint peeling over time.
It is not recommended. Coarse threads are designed for wood; using them in metal can strip the thin metal or fail to penetrate cleanly. Always use Fine Thread for metal studs.
The screw head should sit approximately 0.5 mm to 1 mm below the paper surface. If the paper is broken, the screw loses its holding power and structural integrity.
No, phosphate coatings are designed for interior use only. For exterior cement boards or moisture-prone areas, we recommend Longze Ceramic Coated or Stainless Steel screws.
Coarse Thread screws are the best choice for wood studs and timber framing, as their deep, wide threads provide maximum grip and withdrawal resistance in organic materials.
For fine-thread metal screws, a high-speed RPM (4,000+) is recommended to ensure efficient, clean penetration through light-gauge galvanized steel tracks.
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