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12.9 Grade Black Oxide Allen Head Socket Cap Screws High Strength Hexagon Socket Bolts08.jpg
12.9 Grade Black Oxide Allen Head Socket Cap Screws High Strength Hexagon Socket Bolts09.jpg
12.9 Grade Black Oxide Allen Head Socket Cap Screws High Strength Hexagon Socket Bolts10.jpg
12.9 Grade Black Oxide Allen Head Socket Cap Screws High Strength Hexagon Socket Bolts11.jpg
12.9 Grade Black Oxide Allen Head Socket Cap Screws High Strength Hexagon Socket Bolts12.jpg

High Strength 12.9 Grade Black Oxide Allen Head Socket Cap Screws - China Suppliers & Factory

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Name: 12.9 Grade Socket Cap Screw (Allen Head Bolt)
Material: SCM435/40Cr Alloy Steel
Standards: GB/T 70.1, DIN 912, ISO 4762, ANSI/ASME B18.3
Grade: 12.9 (High-strength Alloy Steel with a tensile strength of ≥1200MPa and yield strength of ≥1080MPa)
Specifications: M2-M36 (customizable options available)
Surface Treatment: Blackening/Oxidation (anti-oxidation, enhances surface hardness, reduces friction coefficient), nickel plating, zinc plating, Dacromet treatment
Design Features: Crafted from high-strength alloy steel, featuring a hexagonal drive structure, cylindrical head design, precision knurled texture, and high-precision full-thread configuration
Applications: Ideal for machinery manufacturing, automotive industry, construction machinery, industrial equipment, and precision instruments
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
OEM: Available
As a leading supplier and factory in China, we are committed to providing high-quality fasteners tailored to your 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.
    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
    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
    Black Oxide for Rust & Corrosion Resistance

    Made of SCM435/40Cr alloy steel with black oxide finishing, the surface forms a magnetic iron oxide film that effectively blocks humid air and mild corrosive media. Although not as salt-spray resistant as stainless steel, it prevents red rust in dry indoor environments, mechanical assembly, and engine compartments. The oxide layer also increases surface hardness and reduces fretting wear, with no hydrogen embrittlement risk – ideal for high-strength fastening.

    Black Oxide Finish
    Ultra-High Strength Metal for Anti-Loosening

    Grade 12.9 offers tensile strength ≥1200MPa and yield strength ≥1080MPa, far exceeding stainless steel or Grade 8.8 bolts. When tightened, the hex socket drive transmits high torque, creating enormous clamping force and significantly increasing thread friction. Even under severe vibration, impact, or cyclic loads (e.g., construction machinery, racing chassis), the bolt remains secure. Metal material never ages, ensuring lasting locking performance.

    High Strength Bolts
    Long Service Life with High Wear Resistance

    The black oxide layer provides self-lubricating properties, reducing thread friction and minimizing galling or cold welding during assembly. The cylindrical head and fine knurling enable hand-tightening without tool slippage or surface damage. Proven in fatigue tests, the head-to-shank fillet and thread root withstand millions of cycles without cracking. Compared to common zinc-plated bolts, this product offers superior wear resistance, longer replacement intervals, and lower maintenance costs.

    Wear Resistance
    Application Scenarios
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    High-Quality 12.9 Grade Socket Cap Screw Display
    Frequently Asked Questions
    What makes Grade 12.9 bolts superior to other grades?
    Grade 12.9 bolts offer ultra-high tensile strength (≥1200MPa) and yield strength (≥1080MPa), significantly outperforming standard Grade 8.8 or stainless steel bolts, making them ideal for heavy-duty machinery and high-vibration environments.
    Is the black oxide finish effective against rust?
    Yes, the black oxide finish creates a magnetic iron oxide film that blocks humid air. While it is best suited for dry indoor environments or engine compartments, it provides excellent protection without the risk of hydrogen embrittlement.
    Can I request custom specifications for these screws?
    Absolutely. We offer flexible customization for head and slot shapes, extra large or long specifications, special materials, and even personalized packaging and labeling.
    How do you ensure the quality of the raw materials?
    We implement a strict Quality Control System that includes raw material source locking, full traceability of furnace number batches, and third-party material certification.
    Do you provide technical support for product selection?
    Yes, our technical services include on-site failure analysis, selection calculations, BOM optimization, and guidance on installation tool selection.
    Are samples available for testing before bulk orders?
    We provide free sample making and testing services to ensure our high-strength fasteners meet your specific application requirements before you commit to a large purchase.