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

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Name: Large Flat Washer Head Phillips Self-Drilling Tek Screw
, Material: 304 Stainless Steel / Premium Carbon Steel
, Standards: GB/T 15856.2, DIN 7504N
, Grades: Carbon Steel: Grade 4.8 / Grade 8.8 (High Strength), Stainless Steel: A2-70 (304)
, Specifications: Available in sizes M3.5, M4.2, M4.8, M5.5, M6.3, etc.; Lengths ranging from 13mm to 150mm with customization options
, Surface Treatment: Carbon Steel treated with Environmentally Friendly Blue-White Zinc / Yellow Zinc, Stainless Steel with Natural Electrolytic Polishing / Passivation treatment
, Design Features: Equipped with a self-drilling tin can tip, integrated large flat-head flange, cross-groove drive, high-strength anti-slip threads, and dual-material for anti-corrosion and rust-proofing
, Applications: Ideal for steel structure buildings, color steel tile installation, light steel keel partition walls and ceilings, electromechanical equipment and electrical box assembly, ventilation ducts, HVAC engineering, as well as furniture and wood product modifications
, Delivery Time: 15-30 days after receiving advance payment
, Origin: China
, Brand: JGD
, Minimum Order Quantity: 10,000 pieces (negotiable)
, Samples: Available upon request
, Packaging: Boxed, bulk, pallet, or customized packaging options
, OEM: Available to meet specific requirements
, As a leading factory and supplier based in China, we provide high-quality Large Flat Washer Head Phillips Self-Drilling Tek Screws tailored to a wide range of industrial and construction needs.

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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 And Interpretation
    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.

    Washer Head

    One-Piece Large Flat Washer Head + Anti-Slip Ribs

    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 and equipment housings.

    Corrosion Protection

    Dual-Material Corrosion Protection + Hardened Threads

    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 to withstand long-term wind loads and vibration.

    Factory Environment

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    High-Quality Stainless Steel Self-Tapping Screw Display

    Frequently Asked Questions

    Q1: Do these screws require pre-drilling in metal?
    No, our self-drilling screws feature a built-in tip that drills, taps, and fastens in a single step, eliminating the need for pre-drilling.
    Q2: What materials are available for these screws?
    We offer 304 Stainless Steel for superior corrosion resistance in outdoor/coastal environments and hardened Carbon Steel for heavy-duty indoor applications.
    Q3: How do the anti-slip ribs work?
    The anti-slip ribs located under the washer head bite into the workpiece surface during tightening, providing mechanical locking to prevent loosening from vibration.
    Q4: Can I customize the head shape or packaging?
    Yes, we provide flexible customization for head shapes, slot types, surface treatment colors, and personalized packaging/labeling.
    Q5: How do you ensure the quality of each batch?
    We utilize a full traceability system based on furnace numbers, raw material source locking, and fully automatic optical sorting to ensure 100% compliance.
    Q6: Are these screws suitable for thin metal panels?
    Absolutely. The large flat washer head design distributes the load over a wider area, preventing deformation or cracking of thin or soft substrates.