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China Manufacturers of 304/316 Stainless Steel Flange Hex Nuts, Serrated Anti-Loosening Nuts - Factory Direct Supply

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Introducing our high-quality Flange Hex Nut (Serrated Flange Nut), crafted from premium materials including AISI 304/316 stainless steel, known for its exceptional corrosion and rust resistance, as well as 45# steel and 10B21 alloy steel for robust applications. These nuts adhere to stringent standards such as GB/T 6177.1, DIN 6923, ISO 4161, and EN 1661, ensuring reliable performance across various industries.

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Our Flange Hex Nuts are available in grades A2-70 (30and A4-80 (31for stainless steel, as well as carbon steel grades 8 and 10. With specifications ranging from M3 to M24, customization options are also offered to meet your specific needs.

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We provide a variety of surface treatments including natural polishing, passivation (corrosion resistance without coating), electro-galvanizing (blue-white zinc/color zinc), hot-dip galvanizing, and Dacromet treatment, which enhances rust prevention and wear resistance.

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Designed with a one-piece flange molding and a serrated anti-slip feature, these high-precision threaded nuts ensure easy installation while providing superior hold. Ideal for applications in the automotive industry, machinery manufacturing, construction engineering, and outdoor or marine environments, our hex nuts are perfect for general assembly tasks.

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As a leading China supplier and factory, we prioritize quality and customer satisfaction. Delivery time is typically 15-30 days upon receipt of advance payment. Our minimum order quantity is 10,000 pieces, but we offer negotiable terms. Samples are available upon request, and we provide various packaging options including boxed, bulk, pallet, or customized solutions. OEM services are also available to cater to your specific requirements.

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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
    Flexible Customization Capability

    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

    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
    Multi-Material Series

    Multi-Material & Full Strength Series

    Our flange hex nuts are made of AISI 304/316/201 stainless steel or 45#/10B21 alloy steel, with strength grades including stainless steel A2-70 (304), A4-80 (316), and carbon steel grades 8/10. The 316 stainless steel variant offers excellent chloride corrosion resistance, passing ≥720 hours of salt spray testing to withstand coastal and humid environments. Carbon steel options with electro galvanizing, hot-dip galvanizing, or Dacromet coating balance high strength and rust/wear protection. Thread sizes range from M3 to M24 with custom options available, delivering reliable fastening for automotive, machinery, and construction applications.

    Anti-Slip Design

    One-Piece Flange + Serrated Anti-Slip Design

    Manufactured to international standards including DIN 6923, GB/T 6177.1, and ISO 4161, our nuts feature an integrated flange and serrated anti-slip base. The flange replaces flat washers to distribute pressure evenly and protect workpiece surfaces, while the serrated teeth bite into the contact surface during tightening to create a mechanical lock against vibration-induced loosening. This dual-protection design ensures stable performance under alternating loads in high-dynamic applications such as automotive chassis and vibrating machinery, eliminating the risk of loosening or dislodgement.

    Quick Install Design

    Washerless Quick-Install Design for Efficient Assembly

    The one-piece structure eliminates the need for separate flat washers, simplifying installation: simply thread the nut onto the bolt and tighten with a standard wrench, with the flange providing automatic alignment. Stainless steel nuts with passivated/polished finishes are suitable for hygiene-sensitive applications without coating contamination, while galvanized carbon steel versions offer enhanced corrosion resistance for outdoor use. Widely applicable in general assembly, construction, and marine equipment, they provide exceptional versatility and assembly efficiency.

    Application Scenarios

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    High-Quality Stainless Steel Flange Nut Display

    Frequently Asked Questions

    What materials are available for your flange hex nuts?
    We offer AISI 304, 316, and 201 stainless steel, as well as 45# and 10B21 alloy steel. Strength grades range from A2-70 and A4-80 for stainless to grades 8 and 10 for carbon steel.
    What are the benefits of the serrated flange design?
    The serrated teeth provide a mechanical locking mechanism that bites into the material surface, significantly increasing resistance to loosening caused by high-frequency vibrations.
    Do I need to use a separate washer with these nuts?
    No, the integrated flange design is specifically engineered to replace flat washers. It distributes pressure evenly over a larger surface area while simplifying the assembly process.
    Which international standards do your products follow?
    Our flange nuts are manufactured in strict accordance with DIN 6923, GB/T 6177.1, and ISO 4161 international standards to ensure global compatibility.
    Can you provide custom surface treatments for outdoor use?
    Yes, for carbon steel products, we provide electro galvanizing, hot-dip galvanizing, and Dacromet coatings, which can withstand over 720 hours of salt spray testing for superior corrosion resistance.
    What is the typical size range for these nuts?
    We maintain a standard inventory for thread sizes ranging from M3 to M24. We also offer customization for extra-large or extra-long specifications based on your project requirements.