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China Suppliers Factory Large Flat Head Self-Drilling Screws - Stainless Steel & Carbon Steel with Washers

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Product Name: Large Flat Washer Head Phillips Self-Drilling Tek Screw
, Materials: Made from high-quality 304 Stainless Steel and Premium Carbon Steel
, Standards: Complies with GB/T 15856.2 and DIN 7504N standards
, Grades: Carbon Steel available in Grade 4.8 and Grade 8.8 (High Strength); Stainless Steel in A2-70 (304)
, Specifications: Sizes include M3.5, M4.2, M4.8, M5.5, M6.3, and more; Lengths range from 13mm to 150mm, with customization options available
, Surface Treatments: Carbon Steel features environmentally friendly blue-white or yellow zinc coatings, while Stainless Steel undergoes natural electrolytic polishing and passivation treatment
, Design Features: Includes a self-drilling tin can tip, integrated large flat-head flange, cross-groove drive, high-strength anti-slip threads, and dual-material anti-corrosion/rust-proofing capabilities
, Applications: Ideal for steel structure constructions, color steel tile installations, light steel keel partition and ceiling systems, electromechanical equipment assembly, electrical box assembly, and HVAC engineering projects, as well as furniture and wood product modifications
, Delivery Time: 15-30 days after advance payment is received
, Origin: China
, Brand: JGD
, Minimum Order Quantity: 10,000 pieces (negotiable)
, Samples: Available upon request
, Packaging: Options include boxed, bulk, pallet, or customized packaging
, OEM Services: Available for custom orders
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, As a leading manufacturer and supplier from China, our factory is dedicated to providing high-quality self-drilling screws that meet your specific needs. Choose our Large Flat Washer Head Phillips Self-Drilling Tek Screws for robust performance and reliability.

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    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws01
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    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws01

    Key Features

    Our self-tapping screws are crafted from food-grade 304 stainless steel and treated to achieve metric Grade 12.9 ultra-high strength, overcoming the traditional hardness limitations of standard stainless steel. Featuring a countersunk Phillips head design, these screws can be installed flush with the workpiece surface for a zero-profile finish, making them ideal for precision electronics and architectural decoration. We have optimized the thread geometry for different substrates (metal, wood) to ensure low-torque driving with high-torque clamping, effectively preventing stripping. As a superior alternative to standard Tek screws, these fasteners perform exceptionally well in thin sheet metal connections, providing an intelligent fastening solution that balances aesthetics with high load-bearing capacity.
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    Precision Manufacturing Process

    From wire rod to finished product, we strictly adhere to multiple international standards including ISO, DIN, ANSI, and GB. Utilizing multi-station cold forging technology, we ensure shank diameter tolerances are controlled within microns. Threads are formed through a precision thread rolling process to enhance fastening force. For non-standard requirements, we employ optical imaging sorters to reject minute defects like head cracks. In post-treatment, we offer a wide range of surface finishing options: from conventional zinc plating and nickel plating to highly corrosion-resistant Hot-Dip Galvanizing (H.D.G.), as well as decorative polishing and black anodizing. We even provide food-grade passivation treatment, ensuring every screw has a prolonged fatigue life in demanding environments.
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    Transparency & Customization

    As a source factory, we are committed to breaking down the information barriers of traditional trade. From mill certificates for raw materials to hardness grades (covering Grade 4.8 to Grade 12.9, as well as A2-70 and A4-80 marine-grade stainless steel), all test data is traceable. We support full-chain customization: dimensionally, we can adjust thread length and head thickness according to drawings; functionally, we can combine processes like sandblasting, electrophoretic coating (e-coating) , or chrome plating. Whether you need British Standard (BS) fasteners or require a special colored anodized finish, we offer small-batch sampling. This ensures that when you purchase fasteners from us, you not only receive high-quality products but also full transparency and control over the entire process, from material selection to packaging.
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    No Pre-Drilling · Rust Resistant · More Secure

    This stainless steel Phillips countersunk self-tapping screw, with its rust-resistant and corrosion-resistant material, one-step self-tapping design, and aesthetically pleasing countersunk head structure, has become the preferred solution for metal substrate fastening scenarios that is efficient, reliable, and aesthetically pleasing.
    Product Details

    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

    • 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
    Self-Drilling Tip

    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.

    Large Flat Washer Head

    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.

    Corrosion Protection

    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

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    High-Quality Stainless Steel Self-Tapping Screw Display

    Frequently Asked Questions

    Do these self-tapping screws require pre-drilling?
    No, our screws feature a built-in self-drilling tip that allows for one-step installation without the need for pre-drilling or punching in most metal substrates.
    What materials are used for these screws?
    We offer high-grade 304 stainless steel for superior corrosion resistance in outdoor/coastal environments, and hardened carbon steel with zinc plating for indoor applications.
    What is the benefit of the large flat washer head?
    The integrated large flat washer head provides a larger bearing surface, which prevents deformation or cracking of thin panels and distributes the load more evenly.
    Are these screws resistant to loosening from vibration?
    Yes, the bottom of the head features anti-slip ribs that create a mechanical lock with the surface, making them ideal for high-vibration environments like equipment housings.
    Can I order customized head shapes or colors?
    Absolutely. We offer flexible customization for head/slot shapes, surface treatment colors, and even specialized packaging to meet your project requirements.
    How do you ensure the quality of your fasteners?
    We maintain full traceability via furnace numbers, use automatic optical sorting, and conduct rigorous testing in our metallographic and mechanical joint laboratory.