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Large & Extra Large 304/316 Stainless Steel Flat Washers - China Factory & Suppliers, DIN 9021 Standard

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Product Name: Flat Washer (Fender Washer / Extra Large Flat Washer)
Material: AISI 304/316 Stainless Steel (corrosion resistant), Q235 carbon steel (rust resistant)
Standards: GB/T 97.1, GB/T 96.1, DIN 9021, ISO 7091, ANSI B18.22.1
Grade: .A2 (304)/A4 (316), 4.8 grade/8.8 grade (custom carbon steel options available)
Specifications: Available in M2-M64 (customizable to suit your needs)
Surface Treatment: Stainless steel with natural polish/passivation (corrosion resistant, no coating), carbon steel options include electroplated zinc (blue-white zinc/color zinc), and hot-dip galvanized
Design Features: Enlarged outer diameter, high-precision openings, optional thickened specifications, stainless steel corrosion resistance, and smooth flat surfaces
Applications: Ideal for construction engineering, automotive and agricultural machinery, outdoor facilities, general assembly, and electromechanical equipment
Delivery Time: 15-30 days post-advanced payment
Origin: China
Brand: JGD
Minimum Order Quantity: 10,000 pieces (negotiable)
Samples: Available upon request
Packaging: Boxed/Bulk/Pallet or customized options available
OEM: Custom manufacturing services available

As a leading factory and supplier located in China, we ensure high-quality flat washers tailored to meet your specific requirements. Our extensive range of options makes us the preferred choice for various industry applications, giving you reliable performance and durability.

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    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws01
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    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
    ⚙️ 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
    🛡️ 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
    Customization Capability
    🎨 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
    🛠️ 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
    Full-Size Options
    💎 Multi-Material & Full-Size
    Our flat washers (including extra-large fender washers) are available in 304/316 stainless steel (A2/A4) and Q235 carbon steel (grades 4.8/8.8). Polished and passivated stainless steel offers natural corrosion resistance, while galvanized carbon steel provides cost-effective rust protection. Sizes from M2 to M64.
    Pressure Distribution
    📊 Enhanced Pressure Distribution
    Manufactured to DIN 9021 and GB/T 97.1 standards, the oversized outer diameter significantly increases contact area, effectively distributing clamping pressure to prevent damage to soft materials or thin sheets.
    Versatility
    🚀 Bulk Assembly Versatility
    These washers install easily without special tools. Ideal for construction, automotive, and mechanical equipment. Complete specifications and custom options available for factory supply.
    📂 Application Scenarios
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    🎥 High-Quality Flat Washer Display
    ❓ Frequently Asked Questions
    Q1: What materials are available for your flat washers?
    We offer flat washers in 304 and 316 stainless steel (A2/A4) for superior corrosion resistance, as well as Q235 carbon steel in grades 4.8 and 8.8 with various galvanized finishes.
    Q2: Do your washers comply with international standards?
    Yes, our products are manufactured according to DIN 9021, GB/T 97.1, and other international standards to ensure compatibility and performance in global projects.
    Q3: Can I request custom sizes or surface treatments?
    Absolutely. We provide flexible customization for inner/outer diameters, thickness, special materials, and specific surface treatment colors or salt spray requirements.
    Q4: What is the benefit of using oversized fender washers?
    Oversized washers provide a larger contact surface area, which helps distribute clamping pressure more evenly, preventing the fastener from pulling through or damaging soft or thin materials.
    Q5: Do you provide technical support for selection?
    Yes, we offer selection calculation, BOM optimization, on-site failure analysis, and free sample making to ensure you get the most efficient fastening solution.
    Q6: How do you ensure product quality and traceability?
    We maintain strict quality control through raw material source locking, full furnace number batch traceability, and third-party material certifications.