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304 Stainless Steel Hex Bolt & Nut Assortment Kit from China Suppliers - A2-70 Grade, Full Thread with Washers Factory

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Name: Stainless Steel Hex Bolt and Nut Set (Includes Washers)
Material: AISI 304 Stainless Steel (Corrosion Resistant, Rust Proof), AISI 316 Stainless Steel, Zinc-Plated Carbon Steel
Standards: Complies with 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: Available in sizes M3-M36 (customizable options 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 with fully threaded bolts, featuring corrosion-resistant stainless steel and an anti-loosening design for enhanced reliability; high-precision threading ensures optimal performance
Applications: Ideal for machinery manufacturing, automotive industry, construction engineering, general assembly, and outdoor and marine use
Delivery Time: 15-30 days after advance payment
Origin: China, provided by leading Suppliers and Factory
Brand: JGD
Minimum Order Quantity: 10,000 pieces, negotiable
Samples: Available upon request
Packaging: Offered in boxed, bulk, pallet, or customized packaging options
OEM Services: Available for tailored solutions

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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
    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

    01Rust-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, eliminating disassembly difficulties caused by corrosion.
    Anti-Loosening Metal Material

    02Tightening & 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. Metal material never ages or becomes brittle, maintaining stable clamping force from -40°C to high temperatures.
    High Wear Resistance

    03Long Service Life

    Stainless steel substrate with passivation offers high hardness and no plating peeling risk. During repeated assembly or high-vibration applications (e.g., automotive chassis, construction machinery), threads and washer contact surfaces resist wear, galling, and deformation. Proven in durability tests, the assembly maintains anti-loosening performance and connection precision for extended life, greatly reducing replacement frequency and maintenance costs.

    Application Scenarios

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    High-Quality Stainless Steel Hex Bolt Display

    Frequently Asked Questions

    Q1: What is the difference between 304 and 316 stainless steel for these bolts?
    304 stainless steel is excellent for general outdoor and humid environments. 316 stainless steel contains molybdenum, providing superior resistance to chlorides and marine environments, making it ideal for coastal or chemical applications.
    Q2: How does the split lock washer prevent loosening?
    The split lock washer acts like a spring, applying continuous tension against the fastener head and the substrate. This increases friction between the threads, helping to resist loosening caused by vibrations.
    Q3: Are these bolts compliant with international standards?
    Yes, our manufacturing process complies with international standards such as DIN, ISO, and ANSI. We provide full traceability and compliance declarations for every batch.
    Q4: Can I request custom head shapes or special packaging?
    Absolutely. We offer flexible customization for head/slot shapes, surface colors, and personalized labeling or packaging to meet your specific project requirements.
    Q5: Do you provide free samples for testing?
    Yes, we offer free sample making and testing services to ensure our fasteners meet your application needs before you commit to a large order.
    Q6: What is the temperature range for these stainless steel fasteners?
    Our stainless steel bolts maintain stable performance in extreme temperatures ranging from -40°C to high industrial heat environments without becoming brittle or losing clamping force.