Product Details
Product Description
China factory direct supply black phosphate Countersunk Bugle Head Self Drilling Screws for wholesale. These professional drywall screws feature a bugle head design that prevents paper tearing and provides a clean finish. The black phosphate coating offers corrosion resistance and reduces glare. Self-drilling point eliminates pre-drilling needs. Perfect for drywall installation, metal stud framing, and construction projects. Bulk discounts available for distributors and contractors.
Technical Specifications
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Standard | ASTM C1513, DIN 7504 | Thread Type | Self-Tapping |
| Head Type | Countersunk (Bugle Head) | Point Type | Self-Drilling Point |
| Drive Type | Phillips #2 | Coating | Black Phosphate |
| Material | Low Carbon Steel | Hardness | 40-45 HRC |
| Tensile Strength | 800 MPa | Corrosion Resistance | Salt spray test 48 hours |
| Point Size | #2, #3 available | Head Angle | 90° Standard |
Product Size (Popular Specifications)
Common specifications for global markets:
| Diameter (mm) | Diameter (Inch) | Length (mm) | Length (Inch) |
|---|---|---|---|
| 3.5 mm | #6 | 25 mm | 1″ |
| 3.5 mm | #6 | 32 mm | 1-1/4″ |
| 4.2 mm | #7 | 38 mm | 1-1/2″ |
| 4.2 mm | #7 | 45 mm | 1-3/4″ |
| 4.8 mm | #8 | 50 mm | 2″ |
Note: Special sizes available for OEM orders
Application Scenarios
These black phosphate countersunk flat bugle head self drilling screws are widely used in multiple construction and industrial applications where durability, clean finish, and precise drilling are required:
- Drywall and gypsum board installation — ideal self drilling screws for drywall and steel stud framing, ensuring fast penetration and strong holding power.
- Metal framing and ceiling systems — reliable black phosphate self drilling screws for metal framing and light gauge steel connections.
- Wood-to-metal assembly — suitable for flat bugle head self drilling screws for wood-to-metal fastening in interior construction projects.
- Electrical and HVAC ductwork — durable and anti-corrosion black phosphate coated self drilling screws for HVAC installations.
- General construction and renovation — cost-effective China OEM self drilling fasteners for various building materials.
Frequently Asked Questions
A: The black phosphate coating improves corrosion resistance and surface lubrication, making these countersunk bugle head self drilling screws ideal for drywall and steel framing applications. It also prevents rust stains on interior surfaces, ensuring a clean finish.
A: Yes. Our black phosphate self drilling screws for drywall and metal framing feature a sharp drill point and bugle head design that ensures fast penetration and a flush surface fit. They perform well in both steel stud and gypsum board applications.
A: Absolutely. As a China OEM self drilling fasteners manufacturer, we supply bulk wholesale black phosphate self drilling screws for distributors, hardware importers, and construction contractors worldwide. Custom packaging and logo printing are available.
A: Our countersunk flat bugle head self drilling screws conform to DIN and ANSI standards. Each batch is tested for drill performance, torque strength, and coating adhesion before shipping to ensure consistent quality.
A: While zinc plated screws provide stronger corrosion resistance for outdoor use, black phosphate self drilling screws are optimized for indoor drywall, ceiling, and steel framing applications where appearance and low cost are priorities.