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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 Direct

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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, tensile strength ≥1200MPa, yield strength ≥1080MPa)
Specifications: M2-M36 (customizable)
Surface Treatment: Blackening/Oxidation (anti-oxidation, enhances surface hardness, reduces friction coefficient), nickel plating, zinc plating, Dacromet treatment
Design Features: Made from high-strength alloy steel, featuring a hexagonal drive structure, cylindrical head design, precision knurled texture, and high-precision full-thread design.
Applications: Widely used in machinery manufacturing, the 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
Packaging: Boxed/Bulk/Pallet or customized packaging
OEM: Available
As leading suppliers from China, our factory ensures top quality and competitive pricing for all your socket cap screw 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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    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.
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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 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 Finish
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    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.

    Ultra-High Strength
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    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.

    Wear Resistance
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    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. Proven in fatigue tests, the head-to-shank fillet and thread root withstand millions of cycles without cracking.

    Application Scenarios
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    High-Quality 12.9 Grade Socket Cap Screw Display
    Frequently Asked Questions
    Q1: What are the mechanical properties of Grade 12.9 screws?
    Grade 12.9 is one of the highest strength classes for bolts, providing a minimum tensile strength of 1200 MPa and a yield strength of 1080 MPa, making them ideal for heavy-duty industrial applications.
    Q2: How does the Black Oxide finish protect the screw?
    Black oxide creates a magnetic iron oxide film on the surface. This layer helps resist mild corrosion and prevents rust in dry indoor or oily environments while maintaining the dimensional accuracy of the threads.
    Q3: Are these socket cap screws resistant to loosening under vibration?
    Yes. Due to their high tensile strength, they can be tightened with high torque, creating significant clamping force and thread friction, which effectively prevents loosening even under severe vibration or cyclic loads.
    Q4: Can I request custom head shapes or packaging?
    Absolutely. Our flexible customization capability allows for personalized head/slot shapes, special materials, custom surface treatment colors, and personalized packaging or labeling to meet your specific needs.
    Q5: Do you provide quality traceability for your products?
    Yes, our Quality Control System includes full traceability by furnace number and batch, third-party material certification, and open process parameters to ensure international standard compliance.
    Q6: What technical support services do you offer?
    We offer on-site failure analysis, selection calculations, BOM optimization, installation guidance, and free sample making and testing to ensure you have the right fastener for your application.