12.9 Grade Alloy Steel Full Thread Hexagon Socket Head Cap Screws
DISLAB Precision offers high-strength 12.9 grade alloy steel full thread hexagon socket head cap screws, engineered for demanding industrial, mechanical, and automotive applications. These fasteners deliver exceptional tensile strength, torque resistance, and durability under extreme stress.
Made from premium alloy steel, quenched and tempered to achieve hardness up to ≤44 HRC, our screws withstand tensile forces far exceeding standard-grade fasteners. The full thread design ensures maximum engagement, while the hexagon socket drive enables efficient torque transfer without damaging the screw head. Available in metric sizes from M1.4 to M20, lengths 2mm up to 160mm, covering nearly all industrial fastener requirements. Black oxide finish provides basic corrosion resistance and a professional appearance.
These high-torque screws are designed to perform under continuous vibration and heavy loads – a reliable choice for critical assemblies where failure is not an option.
⚙️ Product Advantages
12.9 Grade Alloy Steel
Premium alloy steel + heat treatment delivers exceptional tensile strength, shock resistance, and impact toughness, far exceeding standard fasteners.
High Hardness & Durability
Quenched & tempered to ≤44 HRC, ensures long-lasting performance under continuous heavy loads and vibration.
Full Thread Design
Complete thread engagement provides maximum holding power, reducing risk of loosening under dynamic forces.
High Torque Resistance
Hexagon socket drive withstands up to 800 N·m torque (M20 size), ensuring secure fastening in high-torque assemblies.
📐 Key Specifications
Precision heat treatment & quality control: Each batch undergoes strict Rockwell hardness testing (≤44 HRC) and tensile validation to guarantee mechanical properties matching ISO 898-1 standards. The image shows our advanced hardness test procedure ensuring consistent performance in extreme environments.
| Material | 12.9 Grade Alloy Steel (Quenched & Tempered) |
|---|---|
| Type | Full Thread Hexagon Socket Head Cap Screw (Allen Bolt) |
| Thread Sizes | M1.4, M1.6, M2, M2.5, M3, M4, M5, M6, M8, M10, M12, M16, M18, M20 |
| Length Range | 2mm to 160mm (2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,18,20,22,25,28,30,35,38,40,45,50,55,60,65,70,75,80,90,100,110,120,130,140,150,160mm) |
| Hex Socket Sizes | 1.3mm, 2.0mm, 2.5mm, 3.0mm, 4.0mm, 5.0mm, 6.0mm, 8.0mm, 10.0mm, 12.0mm, 14.0mm, 17.0mm |
| Pitch Options | 0.3, 0.35, 0.4, 0.45, 0.5, 0.7, 0.8, 1.0, 1.25, 1.5, 1.75, 2.0, 2.5 mm |
| Hardness | ≤44 HRC (after heat treatment) |
| Max Torque (M20) | Up to 800 N·m |
| Surface Treatment | Black oxide finish for basic corrosion resistance |
📏 Full Thread Dimensions & Size Chart
Our complete size chart covers M1.6 through M20 with detailed head thickness, hexagon socket size, and length combinations. The full thread profile ensures maximum engagement and clamp load. Whether you need miniature M1.4 screws for electronics or M20 bolts for heavy machinery, every size complies with DIN 912 / ISO 4762 standards. This dimensional diagram (right) provides a quick reference for engineers and procurement teams, allowing precise specification matching. The black oxide finish also offers aesthetic uniformity and light corrosion protection for indoor/outdoor use.
All screws undergo rigorous gauging to ensure thread conformity and head geometry accuracy, eliminating assembly issues.
🏭 Common Applications
- Heavy Machinery & Equipment
- Automotive & Transportation
- Mechanical Engineering
- Construction & Structural Projects
- Agricultural & Farm Equipment
- Marine & Offshore (protected environments)
📦 Real Customer Case – Bulk Order to Brazil
A Brazilian industrial machinery manufacturer ordered 50,000 pieces of M8, M10, and M12 screws in various lengths for heavy-duty industrial pumps. They required fasteners able to withstand continuous vibration, high torque, and humid tropical conditions. DISLAB Precision supplied 12.9 grade alloy steel screws after confirming material grade, heat treatment specs and finish requirements. Full quality checks on hardness, tensile strength and dimensional accuracy were conducted. The customer confirmed flawless performance even under harsh operating conditions — a typical example of our capability to handle bulk custom fastener requirements with stock availability and fast delivery.
🏆 Why Choose DISLAB Precision
At DISLAB Precision, we are your trusted global supplier of industrial parts and accessories, including fasteners, spacers, standoffs, and custom hardware solutions.
Backed by a network of 300+ qualified partner facilities, we deliver over 50 million pieces monthly, supporting both small sample orders and large-volume bulk projects. Every product undergoes strict quality checks for material grade, dimensional accuracy, and surface finish before delivery.
With 40+ engineering and sourcing experts on our team, we ensure consistent quality, reliable lead times, and flexible solutions tailored to your needs. We offer OEM/ODM services, custom material options, and flexible packing to meet the unique requirements of customers worldwide.
If you need industrial parts or accessories for your project or bulk supply, contact us today to discuss your specifications and get a quote.
✅ High quality | 🌍 Global shipping | 📐 Custom drawing support
Direct Contact Channels
- One-stop service: design, customization, production, and global delivery
- OEM/ODM solutions for industrial and export-oriented buyers
