Product Introduction
Black phosphate drywall screws are engineered for fastening gypsum boards to metal studs or wood framing in interior construction systems.
Technical Specifications
| Parameter | Specification |
| Material | Carbon steel (C1022A / C1022), optional stainless steel |
| Surface Finish | Black phosphate coating |
| Head Type | Bugle head |
| Drive Type | Phillips PH2 / PH3 |
| Thread Type | Fine thread (metal studs), coarse thread (wood studs) |
| Diameter Range | 3.5 mm, 3.9 mm, 4.2 mm, 4.8 mm |
| Length Range | 13 mm – 150 mm |
| Point Type | Sharp point |
| Head Diameter | 8.5 – 10 mm |
| Pitch | 1.4 mm |
| Tensile Strength | ≥ 1000 N/mm² |
| Surface Hardness | HV 450 – 700 |
| Core Hardness | HV 270 – 450 |
| Torque Resistance | Optimized for power tool driving, reduced cam-out risk |
| Bending Resistance | Can withstand moderate angular deformation without head failure |
Engineering Design Features
Crystalline black phosphate coating that reduces installation friction and provides corrosion resistance for indoor use.
Fine thread for steel studs and coarse thread for wood framing for stable substrate engagement.
Bugle head distributes load on gypsum board surface to reduce paper damage during tightening.
Sharp point enables direct penetration into gypsum board and light gauge steel or wood without pre-drilling in standard applications.
Application Scenarios
Gypsum board wall systems
Interior partition wall construction
Ceiling framing systems
Residential and commercial interior finishing systems
Light steel keel drywall systems
Wood framing interior structures
Installation Considerations
Use PH2 or PH3 driver bits to maintain torque stability
Avoid over-tightening to prevent gypsum board surface damage
Maintain perpendicular driving angle during installation
Select fine thread for metal studs and coarse thread for wood framing
Power drivers are recommended for high-volume installation work
Size Selection Guidance
3.5 mm (#6): Standard gypsum board installation in typical residential or commercial interiors
4.2 mm (#8): Thicker boards or applications requiring higher holding force
4.8 mm (#10): Reinforced structures or non-standard framing conditions
Manufacturing and Quality Control
Wire material selection and cold forming
Thread rolling with dimensional control
Heat treatment for mechanical strength consistency
Surface phosphating treatment
Final inspection of dimensions and surface condition
FAQ
Q: Can these screws be used in outdoor or high-humidity environments?
A: Black phosphate coating provides basic corrosion resistance; stainless steel or additional coatings are required for outdoor or high-humidity environments.
Q: What is the recommended torque range for installation?
A: Controlled torque with PH2/PH3 driver bits minimizes cam-out; torque varies by diameter and substrate.
Q: Are washers or additional fasteners required for drywall installation?
A: Washers are required only for sealing or vibration-resistant applications; standard drywall installation does not require them.
Q: How to choose the correct screw length for a project?
A: Select length based on board thickness plus required embedment into stud without protrusion.
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