Our black oxide hex flange self‑drilling screws are available in 410 stainless steel (HV 400‑500) or medium‑carbon steel (Grade 8.8‑10.9), with a black Dacromet or black oxide coating that combines corrosion resistance with a dark aesthetic. The integral hex flange head fits power wrenches for high‑torque driving, with anti‑slip serrations underneath to prevent loosening. The hardened twin‑edge drill point penetrates sheet metal and steel sections directly – no pre‑drilling required – completing drilling, tapping, and fastening in one operation. The deep‑pitch wide‑thread design ensures rapid engagement and secure bite. Sizes M4.2‑M6.3 (#8‑#14), lengths 13‑150mm custom. Ideal for premium dark metal roofing, solar PV mounting systems, black sheet metal enclosures, and automotive modifications. Installation: drive directly with an electric drill or impact wrench – the drill point creates the hole while the flange seats firmly.
Black Oxide Hex Flange Self-Drilling Screws 410 Stainless Steel Drill Tail Fasteners for Metal Sheet & Roof Installation
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
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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.
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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.
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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
Industrial Capabilities
• Factory Area: 11,405 square meters
• Certifications: ISO, IATF, CE, RoHS, JIS, ASTM
• Manufacturing : 70+ internationally advanced production lines
• Testing: 30+ sets of precision quality testing equipment
• Annual Output: Up to 50,000,000 tons
From Raw Materials to Finished Products
Closed-loop manufacturing from raw material to final product is made possible by our factory's fully automated production lines for cold heading, precision thread rolling, controlled-atmosphere heat treatment, and eco-friendly surface finishing. Every fastener satisfies strict requirements for strength, precision, and surface quality thanks to inline optical sorting and a digital MES. You guarantee long-lasting, efficient, and ecologically friendly fastening.
Innovation Lab:
Expertise and collaboration drive us forward, constantly pursuing innovative solutions. Have a project? Let's get started.
"Customized Implementation" to "Pain Point Diagnosis" in the Entire Joint R&D Process
We offer more than just common parts. Our multicultural engineering staff actively participates in your project from the start. In order to ensure that creative concepts are swiftly turned into workable solutions that lower total lifecycle costs, we meticulously take into account the application context and tailor solutions in the lab, completely merging technology and application.
Integrated Verification System: Ensuring Innovation with "Test Data"
The drawing board is not the conclusion of the creative process. We offer one-stop verification for everything from corrosion testing to prototype development through our in-house technical center. We employ empirical data to verify the performance stability of customized solutions through comprehensive simulated working condition tests. In addition to achieving genuinely dependable cost reduction and efficiency improvement, this greatly lowers project risks.
