High-Tensile Grade 12.9 Socket Head Cap Screw Specialist
The industry standard for high-stress applications. Our Alloy Steel Socket Bolts deliver 1220 MPa tensile strength for unparalleled mechanical performance.
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Unmatched Strength: The 12.9 Grade Socket Bolt
In mechanical engineering, the Socket Head Cap Screw is the preferred choice for applications requiring a clean look and high torque capability. However, when those applications involve high-vibration machinery or extreme loads, a standard bolt is not enough. You need a Grade 12.9 Socket Head Cap Screw. As a specialized Fastener Manufacturer, Youjia Metals produces these high-tensile Alloy Steel Bolts to withstand a minimum tensile strength of 1220 MPa, ensuring safety where performance cannot be compromised.
Our DIN 912 Bolts are manufactured using premium SCM435 alloy steel, which undergoes a precise heat-treatment process to achieve its final hardness and strength. These Allen Head Bolts are essential for industrial tooling, automotive engine components, and heavy-duty stamping dies. By choosing our Grade 12.9 Hex Socket Fasteners, B2B procurement managers benefit from reduced downtime and superior part longevity.
Extreme Metallurgy
We utilize SCM435 Chromium-Molybdenum steel to ensure maximum fatigue resistance and hardness (HRC 39-44).
- 1220 MPa Tensile Strength.
- Superior impact toughness.
- 100% Alloy verification.
Precision Threads
Every Allen Bolt is cold-forged and thread-rolled to maintain Tight Tolerance and high torque absorption.
- Zero-defect thread geometry.
- 6g/6h Class tolerance.
- Anti-stripping design.
OEM Capabilities
Custom Grade 12.9 Screws based on your CAD drawings, with various coatings like Zinc, Dacromet, or PTFE.
- Special head dimensions.
- Non-standard thread pitches.
- Full MTR Documentation.
| Property Class | Grade 12.9 High-Tensile |
| Tensile Strength | 1220 N/mm² (MPa) Minimum |
| Material | Alloy Steel SCM435 / 42CrMo |
| Standard Compliance | DIN 912 / ISO 4762 / ASME B18.3 |
| Surface Finish | Black Oxide (Standard), Zinc Plated, Nickel, Geomet |
Industry-Leading Applications
Automotive
Engine head bolts and suspension assembly.
Die Stamping
High-precision tooling and fixture mounting.
Machinery
Construction equipment and heavy robotics.
Aerospace
High-load structural support fasteners.
Grade 12.9 Sourcing FAQ
A: Black Oxide is an industrial standard finish for high-strength bolts. It provides a moderate level of corrosion resistance and, importantly, does not affect the thread dimensions or cause hydrogen embrittlement, which is critical for 12.9 grade fasteners.
A: At Youjia Metals, our Socket Head Cap Screws are cold forged for diameters up to M24. Cold forging enhances the grain structure of the alloy steel, providing significantly better Tensile Strength compared to CNC-machined alternatives.
A: Yes. Every shipment is accompanied by a full Material Test Report (MTR) verifying the hardness, chemical analysis, and tensile load capacity to ensure total compliance with ISO 9001:2015 standards.
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Secure your project with high-tensile reliability. Wholesale and OEM service for Grade 12.9 Socket Screws.
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