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304 Stainless Steel Hex Bolt & Nut Set from China Suppliers - A2-70 Grade, DIN 933 Standards, Factory Direct

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Name: Stainless Steel External Hex Bolt and Nut Set (Stainless Steel Hex Bolt and Nut Assembly with Washers)
Material: AISI 304 Stainless Steel (Corrosion Resistant, Rust Proof), 316 Stainless Steel, Carbon Steel (Zinc-plated)
Standards: GB/T 5783, GB/T 6170, GB/T 97.1), GB/T 93, DIN 933, DIN 934, DIN 125, DIN 127
Grade: A2-70 (30/ A4-80 (316), 8.8 grade / 10.9 grade
Specifications: M3-M36 (customizable)
Surface Treatment: Stainless Steel: Natural Polished / Passivated (No Plating, Corrosion Resistant), Carbon Steel: Electroplated Zinc (Blue-White Zinc / Color Zinc Plating, blackening treatment optional)
Design Features: Comprehensive component set, fully threaded bolts, corrosion-resistant stainless steel, anti-loosening design, high-precision threads
Applications: Ideal for machinery manufacturing, automotive industry, construction engineering, general assembly, outdoor and marine applications
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 available
OEM: Available from our factory in China, ensuring high-quality production from trusted suppliers

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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

    Our Core Advantages

    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
    Quality Control System

    Quality Control System

    • Raw Material Source Locking
    • Full Traceability (Furnace Number)
    • Third Party Material Certification
    • Salt Spray Test Real Time Monitoring
    • International Standard Compliance
    Flexible Customization

    Customization Capability

    • Customizable Head/Slot Shapes
    • Special Materials Application
    • Extra Large/Long Specifications
    • Personalized Packaging & Labeling

    Technical Features

    Stainless Steel Material

    Rust-proof & Corrosion-resistant

    All components (bolt, nut, flat washer, lock washer) are made of 304/316 stainless steel (A2-70/A4-80). High chromium content forms a dense passivation film, preventing rust in humid, salt-spray, or chemical environments. Ideal for outdoor construction, marine equipment, and food machinery.

    Anti-Loosening

    Tightening & Anti-Loosening

    A2-70 stainless steel offers tensile strength ≥700MPa. The split lock washer provides continuous spring force, while the flat washer distributes pressure – together increasing thread friction torque. Effectively resisting vibration and impact loosening from -40°C to high temperatures.

    Wear Resistance

    High Wear Resistance

    Stainless steel substrate with passivation offers high hardness and no plating peeling risk. During repeated assembly or high-vibration applications, threads and washer contact surfaces resist wear, galling, and deformation, greatly reducing maintenance costs.

    Application Scenarios

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    Stainless Steel Hex Bolt Display

    Frequently Asked Questions

    Q1: What materials are used for your hex bolts and washers?

    We use high-quality 304 and 316 stainless steel (A2-70/A4-80), which provide excellent corrosion resistance and mechanical strength for diverse industrial applications.

    Q2: How do you ensure the anti-loosening performance?

    Our assembly combines a split lock washer for continuous spring force and a flat washer for pressure distribution, which significantly increases thread friction and resists vibration.

    Q3: Can these bolts be used in marine or coastal environments?

    Yes, the high chromium content in our stainless steel forms a protective passivation film, making them ideal for salt-spray and humid marine conditions without the risk of rust.

    Q4: Do you provide customization for specific sizes or head shapes?

    Absolutely. We offer flexible customization for head/slot shapes, extra-long specifications, and even personalized surface treatment colors and packaging.

    Q5: What quality control measures are in place during production?

    We maintain full traceability with furnace batch numbers, conduct real-time salt spray monitoring, and utilize fully automatic optical sorting to ensure every piece meets international standards.