Get A Quote!
Leave Your Message
Flat Square Plate Washers 304-316 Stainless Steel Square Washers08.jpg
Flat Square Plate Washers 304-316 Stainless Steel Square Washers09.jpg
Flat Square Plate Washers 304-316 Stainless Steel Square Washers10.jpg
Flat Square Plate Washers 304-316 Stainless Steel Square Washers11.jpg
Flat Square Plate Washers 304-316 Stainless Steel Square Washers12.jpg

China Suppliers Factory Square Flat Washers 304/316 Stainless Steel Thick Stamped Metal Spacers for Construction

,

Product Name: Square Flat Washer (also known as Square Washer / Square Plate Washer / Flat Square Spacer)
Material: Manufactured from high-quality AISI 304/316 Stainless Steel (offering corrosion resistance and rust resistance) and Q235 Carbon Steel.
Standards: Compliant with 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.
Surface Treatment: Options include natural polishing and passivation treatment (for enhanced corrosion resistance) as well as electro-galvanizing or hot-dip galvanizing for improved rust protection.
Design Features: Our square washers feature a square structure design with precise center openings. They can be customized with thickness options and are crafted from corrosion-resistant stainless steel with smooth, burr-free edges.
Applications: Ideal for use in building curtain walls, railings, balustrades, construction engineering, and suitable for outdoor and marine applications, as well as general assembly tasks.
Delivery Time: Fast delivery within 15-30 days upon receiving advance payment.
Origin: Proudly made in China.
Brand: JGD
Minimum Order Quantity: 10,000 pieces, negotiable based on supplier agreements.
Samples: Available for review before purchase.
Packaging: Options include boxed, bulk, pallet, or customized packaging solutions.
OEM: Custom OEM services available to meet specific requirements from our clients.
Why Choose Us: As a leading manufacturer and supplier in China, our factory is dedicated to providing high-quality square flat washers that meet international standards.

,
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws01
    Contact us
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws02
    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
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws03
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws04

    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.
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws04
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws05
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws06

    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.
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws08
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws07
    304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws03

    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-Size Series for All-Weather & Corrosion Resistance

    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, with custom thickened or non-standard options, they deliver reliable pressure distribution for curtain walls, outdoor railings, and more.
    Square Structure

    Square Structure for Enhanced Load Distribution & Anti-Rotation Performance

    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 to workpieces. The square edges also enhance anti-rotation performance, eliminating washer rotation during nut tightening in applications like curtain wall keels and guardrail posts, significantly improving connection stability and reliability.
    Precision Machining

    Precision Machining for Easy Installation & Versatile Application

    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, greatly improving assembly efficiency. Stainless steel washers with polished/passivated 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 construction projects, railings, and heavy equipment assembly, they provide excellent versatility for flat fastener matching needs.

    Application Scenarios

    Application 01Application 02Application 03Application 04Application 05

    High-Quality Square Flat Washer Display Rack

    Frequently Asked Questions

    Q1: What materials are available for your square flat washers?

    We offer square washers in AISI 304 and 316 stainless steel for superior corrosion resistance, as well as Q235 carbon steel in grades 4.8 and 8.8 for high-strength requirements.

    Q2: Why choose a square washer over a standard round washer?

    Square washers provide a larger contact surface area, which is ideal for distributing heavy loads on soft materials like wood or irregular surfaces like channels. Their square edges also prevent rotation during installation.

    Q3: Do your products comply with international manufacturing standards?

    Yes, our square washers are manufactured according to global standards including DIN 436, GB/T 97.1, and JGJ 130, ensuring compatibility and reliability in structural applications.

    Q4: Can you provide customized sizes or surface treatments?

    Absolutely. We support customization for M4 to M24 sizes, specialized thicknesses, and various surface treatments such as hot-dip galvanizing, electro-galvanizing, or mechanical polishing.

    Q5: How do you ensure the quality and durability of the washers?

    We implement a strict quality control system including raw material traceability, real-time salt spray monitoring (up to 720+ hours for 316 SS), and full mechanical testing in our joint laboratory.