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304 Stainless Steel Hex Bolt & Nut Set - China Factory Suppliers, A2-70 Grade, Complete with Washers for Industrial Use

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Name: Stainless Steel External Hex Bolt and Nut Set (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 available)
Surface Treatment: Stainless Steel: Natural Polished / Passivated (No Plating, Corrosion Resistant); Carbon Steel: Electroplated Zinc (Blue-White Zinc / Color zinc plating, with optional blackening treatment)
Design Features: Complete component set, fully threaded bolts, corrosion-resistant stainless steel, anti-loosening design, and high-precision threads
Applications: Ideal for machinery manufacturing, automotive industry, construction engineering, general assembly, outdoor and marine uses
Delivery Time: 15-30 days after receiving advance payment
Origin: China
Brand: JGD
Minimum Order Quantity: 10,000 pieces (negotiable)
Samples: Available for your evaluation
Packaging: Boxed/Bulk/Pallet or customized packaging options available
OEM Services: Available for tailored solutions
As a leading suppliers and factory based in China, we deliver top-quality stainless steel hex bolt and nut sets to meet your project needs.

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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.
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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
    Rust-proof Stainless Steel

    🛡️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. No extra plating needed – ideal for outdoor construction, marine equipment, and food machinery.

    Anti-Loosening Metal Material

    ⚙️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. Full-thread bolt allows precise preload adjustment, effectively resisting vibration and impact loosening.

    High 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. The assembly maintains anti-loosening performance for extended life, reducing maintenance costs.

    Application Scenarios

    Application 1Application 2Application 3Application 4Application 5

    High-Quality Stainless Steel Hex Bolt Display

    Frequently Asked Questions

    What specific grades of stainless steel are available for these bolts?
    We primarily use 304 and 316 stainless steel, corresponding to international grades A2-70 and A4-80, ensuring superior corrosion resistance.
    How do the washers help in preventing loosening?
    The split lock washer provides continuous spring force, while the flat washer distributes pressure, together increasing friction torque to resist vibration.
    Can you provide custom specifications for unique applications?
    Yes, we offer flexible customization for head shapes, slot types, extra large or long specifications, and special material applications.
    Are your manufacturing processes traceable?
    Absolutely. We maintain full traceability through furnace number batching and provide third-party material certifications for transparency.
    Do you offer technical support for bolt selection?
    Yes, our technical services include selection calculations, BOM optimization, on-site failure analysis, and installation guidance.
    Are these fasteners suitable for marine or salt-spray environments?
    Yes, the high chromium content and dense passivation film of our 304/316 stainless steel make them ideal for humid and salt-spray conditions.