12.9 grade high-strength machine screws, compliant with DIN912 international standard and spanning M4-M16 metric sizes, feature a black finish, hex socket drive, cylindrical (cap) head, and left-handed reverse threads. Engineered for specialized industrial applications requiring reverse-thread fastening, these screws combine 12.9 grade alloy steel’s exceptional tensile strength with anti-loosening reverse threads, making them ideal for machinery, automotive parts, and equipment where rotational forces demand secure, counterclockwise-tightening fasteners.
Core Features & Advantages
12.9 Grade Premium Strength: Forged from high-quality alloy steel, 12.9 grade delivers ultra-high tensile strength (≥1220 MPa) and wear resistance. It withstands heavy loads, mechanical vibration, and high-stress environments, outperforming standard-grade screws in specialized industrial scenarios.
DIN912 Standard Compliance: Adheres to DIN912 specifications for hex socket cap screws, ensuring consistent dimensions, precise left-handed threading, and compatibility with global industrial components. Guarantees reliable fit and performance in professional assemblies.
Left-Handed Reverse Thread Design: Reverse (left-handed) threads enable counterclockwise tightening and loosening, specifically designed to resist loosening under reverse rotational forces. Perfect for applications like rotating shafts, pulleys, and equipment where standard right-hand threads may fail.
Hex Socket & Cylindrical Head: Hex socket drive allows accurate tightening in confined spaces, reducing slippage and drive damage. Cylindrical (cap) head provides stable load distribution, while the black industrial finish enhances corrosion resistance and durability.
M4-M16 Size Versatility: The M4-M16 metric size range covers diverse specialized needs, from small precision components to medium-duty industrial assemblies, offering flexibility for machinery, automotive, and heavy-equipment applications.
