Our large flat washer head Phillips self‑drilling Tek screws are made of 304 stainless steel (A2-70) or high‑strength carbon steel (Grade 4.8/8.8). The self‑drilling drill point penetrates sheet metal and light‑gauge steel directly – no pre‑drilling required – completing drilling, tapping, and fastening in one operation. The integrated large flat washer head increases bearing area to prevent material crush‑down, with anti‑slip ribs underneath for vibration resistance. The Phillips recess fits standard tools. Sizes M3.5‑M6.3, lengths 13‑150mm custom. Ideal for steel structure roofing, light steel stud walls, electrical enclosures, HVAC ducts, and furniture assembly. Installation: drive directly with an electric drill or impact driver – the drill point automatically creates the hole.
Stainless Steel & Carbon Steel Large Flat Head Cross Washered Self-Drilling Screws Galvanized Self-Tapping Drill Tail Screws
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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Self-Drilling Tip – No Pre-Drilling, Efficient One-Step Installation
The built-in self-drilling tip penetrates steel sheets, light-gauge steel studs, metal panels, and aluminum profiles directly – no pre-drilling or punching needed. With an electric driver, drilling, tapping, and fastening are completed in a single step – several times faster than ordinary self-tapping screws. Ideal for large roofing, ductwork, and drywall framing projects – significantly reducing construction time and labor costs.
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One-Piece Large Flat Washer Head + Anti-Slip Ribs – Load Distribution & Anti-Loosening
The integrated large flat washer head offers far greater bearing area than countersunk or pan head screws, effectively preventing depression, deformation, or cracking of thin panels or soft substrates during tightening. The bottom face features dense anti-slip ribs that bite into the workpiece surface, creating mechanical locking against vibration and impact loosening – particularly suitable for steel roofing, equipment housings, and electrical box assemblies, staying secure for years.
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Dual-Material Corrosion Protection + Hardened Threads – Heavy-Duty & Durable
304 stainless steel with electro-polishing/passivation resists moisture, rain, and salt spray – ideal for outdoor, coastal, and chemical environments; carbon steel with blue-white/yellow zinc plating offers reliable indoor corrosion protection. Hardened threads and wear-resistant drill tips resist stripping even after repeated use. Fatigue-tested, this screw withstands long-term wind loads, vibration, and temperature changes without failure – extremely low replacement frequency, delivering outstanding cost-performance.
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 dependable, efficient, and eco-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. To ensure that creative concepts are swiftly translated into workable solutions that lower total lifecycle costs, we carefully examine the application context and tailor solutions in the lab, seamlessly fusing technology and application.
Integrated Verification System: Ensuring Innovation with "Test Data"
The drawing board is not where the creative process ends. 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.
