Black Oxide Hex Flange Self-Drilling Screws - 410 Stainless Steel, Metal Sheet Fasteners from China Suppliers & Factory
Manufacturing Process
- ✓Multi Station Cold Heading Technology
- ✓Intelligent Heat Treatment System
- ✓Micron-Level Thread Rolling Process
- ✓Fully Automatic Optical Sorting
- ✓Environmentally Friendly Surface Treatment Line
- ✓Metallographic And Mechanical Joint Laboratory
Quality Control System
- ✓Raw Material Source Locking
- ✓Furnace Number Batch Full Traceability
- ✓Third Party Material Certification
- ✓Process Parameters Open And Transparent
- ✓Salt Spray Test Real Time Monitoring
- ✓International Standard Compliance Declaration
Flexible Customization Capability
- ✓Customizable head/slot Shapes
- ✓Extreme Application Of Special Materials
- ✓Breakthroughs In Extra Large/Long Specifications
- ✓Integrated Assembly Of Components
- ✓Customizable Surface Treatment Colors
- ✓Personalized Packaging And Labeling
Technical Service
- ✓On-Site Failure Analysis
- ✓Selection Calculation And BOM Optimization
- ✓Installation Tool Selection Guidance
- ✓Inventory Management (VMI) Trusteeship
- ✓Free Sample Making And Testing
- ✓International Standard Translation And Interpretation
Black Dacromet/Black Oxide Coating – Corrosion Protection & Dark Aesthetics
Finished with black Dacromet or black oxide, forming a dense anti-corrosion layer that resists moisture, salt spray, and industrial atmospheric corrosion – while meeting the aesthetic needs of high-end dark metal roofing, solar mounting systems, and black sheet metal. Strong adhesion with no chipping or peeling; color stays stable and rust-free outdoors. The unified black finish perfectly blends with dark architecture and auto modification styles – no secondary painting needed.
Dual-Blade Quenched Drill Tip + Deep Wide-Pitch Threads – Fast Penetration & Tight Bite
The drill tip is dual-blade quenched for high hardness and sharp edges, quickly penetrating steel sheets, light-gauge studs, and steel profiles with low resistance and no deviation. The deep wide-pitch thread design speeds up driving while increasing thread-to-substrate contact area for stronger holding power. Combined with the one-piece hex flange head, power wrenches deliver high torque without cam-out – fast and effortless installation.
Flange Anti-Slip Teeth + Hardened Substrate – Vibration-Resistant & Stable Under Load
The hex flange bottom features anti-slip teeth that bite into the substrate during tightening, creating mechanical locking against wind pressure, vibration, and thermal expansion. 410 stainless steel (HV 400-500) or Grade 8.8-10.9 carbon steel substrate offers high tensile strength, withstanding long-term cyclic loads without fatigue or deformation. Durability-tested, this screw maintains permanent locking in solar mounting systems and metal roofing.
Factory Environment
High-Quality Stainless Steel Self-Tapping Screw Display
Frequently Asked Questions
These coatings form a dense anti-corrosion layer that protects fasteners from moisture, salt spray, and industrial atmospheric corrosion. They are ideal for solar mounting systems and dark metal applications where visual integration is required.
The dual-blade quenched tip offers superior hardness and sharpness, allowing it to penetrate steel sheets and studs quickly with low resistance and no deviation, speeding up installation times.
The teeth on the bottom of the flange bite into the mating substrate during tightening. This creates a mechanical lock that prevents the screw from loosening under wind pressure, thermal expansion, or vibration.
Yes, we provide flexible customization options, including custom head and slot shapes, special material applications, extra large/long specifications, and personalized packaging or labeling.
Our quality control system includes raw material source locking, furnace number batch full traceability, third-party material certification, transparent process parameters, and real-time salt spray test monitoring to ensure international compliance.