12.9 grade DIN912 cylindrical (cup) head hex combination screws are high-strength industrial fasteners, fully compliant with the DIN912 German standard for precision and reliability. As 3-in-1 integrated fasteners, they combine a cylindrical head hex bolt, flat washer, and spring washer in one unit, covering metric sizes M3 to M12. Designed for high-torque and heavy-load applications, they are ideal for machinery assembly, automotive components, industrial equipment, and precision fixtures that demand robust fastening performance.
Crafted from high-grade alloy steel and heat-treated to 12.9 grade—one of the highest strength ratings for industrial screws—they offer exceptional tensile strength and wear resistance. The integrated flat washer distributes load evenly to prevent workpiece damage, while the spring washer provides anti-loosening stability for vibration-prone environments. The cylindrical (cup) head and internal hex drive enable secure torque control and easy installation with standard hex tools, streamlining assembly processes and reducing labor costs.
Core Features & Advantages
12.9 grade high-strength alloy steel for superior tensile strength and heavy-load capacity
DIN912 compliance guarantees precise tolerances and global industrial compatibility
3-in-1 integrated design (bolt + flat washer + spring washer) simplifies assembly and saves time
Spring washer ensures anti-loosening performance in vibration-prone applications
M3-M12 size range fits machinery, automotive, and industrial equipment needs
Key Specifications
Material: High-Grade Alloy Steel (Heat-Treated)
Strength Grade: 12.9 Grade
Standard: DIN912 (German Industrial Standard)
Head Type: Cylindrical Head / Cup Head
Drive Type: Internal Hex Drive
Design: 3-in-1 Combination (Bolt + Flat Washer + Spring Washer)
