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China Suppliers 304/316 Stainless Steel Square Flat Washers - Durable Spacers from Factory for Construction & Railing

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Name: Square Flat Washer (also known as Square Washer, Square Plate Washer, or Flat Square Spacer)
Material: Made from AISI 304/316 Stainless Steel, known for its corrosion resistance and rust resistance, and Q235 Carbon Steel.
Standards: Manufactured according to GB/T 97.1, JGJ 130, DIN 436, and ISO 7091 standards.
Grade: Available in A2 (304 Stainless Steel), A4 (316 Stainless Steel), and Carbon Steel grades 4.8 and 8.8.
Specifications: Sizes range from M4 to M24, with customizable options available to meet specific needs.
Surface Treatment: We offer natural polishing and passivation treatment to ensure corrosion resistance, along with optional electro-galvanizing or hot-dip galvanizing for enhanced rust protection.
Design Features: Our square flat washers feature a robust square structure, precise center opening, optional thickness, and smooth, burr-free edges for safe handling and superior performance.
Applications: Ideal for building curtain walls, railings and balustrades, construction engineering, outdoor and marine applications, as well as general assembly tasks.
Delivery Time: We ensure a prompt delivery within 15-30 days after receiving advance payment.
Origin: Proudly manufactured in China
Brand: JGD
Minimum Order Quantity: Start with a minimum order of 10,000 pieces, with negotiable terms.
Samples: Available for evaluation.
Packaging: Options include boxed, bulk, pallet, or custom packaging solutions.
OEM: We support OEM services to cater to your unique requirements.

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

    • • 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
    Stainless Steel Square Washers

    Multi-Material & Full-Size Series

    Our square flat washers are made of AISI 304/316 stainless steel or Q235 carbon steel, with strength grades including stainless steel A2 (304)/A4 (316) and carbon steel grades 4.8/8.8. The 316 stainless steel variant offers excellent chloride corrosion resistance, passing ≥720 hours of salt spray testing to withstand highly corrosive environments such as coastal bridges and ship decks. Carbon steel options with electro or hot-dip galvanizing balance high strength and rust protection. Available in sizes matching M4-M24 bolts.
    Square Structure Washers

    Enhanced Load Distribution

    Manufactured to standards including GB/T 97.1, JGJ 130, and DIN 436, our square washers provide a larger contact area than traditional round washers on flat or irregular surfaces such as square tubes, channels, and wood. This effectively disperses bolt preload to prevent surface damage. The square edges also enhance anti-rotation performance, eliminating washer rotation during nut tightening.
    Precision Machining

    Precision Machining & Easy Installation

    With precision center holes and smooth, burr-free edges, our washers can be easily slipped onto bolts or screws and locked with nuts without additional alignment adjustments. Stainless steel washers with polished/passivated finishes are suitable for hygiene-sensitive applications, while galvanized carbon steel versions offer enhanced corrosion resistance for outdoor use.

    Application Scenarios

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    High-Quality Square Flat Washer Display Rack

    Frequently Asked Questions

    What materials are available for your square flat washers?
    We offer AISI 304/316 stainless steel and Q235 carbon steel. Stainless steel grades include A2 and A4, while carbon steel options include grades 4.8 and 8.8 with various surface treatments.
    How does the corrosion resistance of your 316 stainless steel washers perform?
    Our 316 stainless steel washers are designed for highly corrosive environments. They pass ≥720 hours of salt spray testing, making them ideal for coastal and maritime applications.
    What are the benefits of a square structure over a standard round washer?
    Square washers provide a larger contact area, which better disperses bolt preload and prevents surface damage. Their edges also offer superior anti-rotation performance during tightening.
    Which international standards do your products comply with?
    Our manufacturing processes comply with major international and industrial standards, including GB/T 97.1, JGJ 130, and DIN 436.
    Do you offer customization for non-standard sizes?
    Yes, we provide flexible customization for thickened plates, non-standard dimensions, special materials, and personalized packaging or labeling to meet specific project needs.
    What technical support do you provide for fastener selection?
    We provide comprehensive technical services including selection calculations, BOM optimization, on-site failure analysis, and free sample making and testing.