M1.6/M2/M4 Grade 12.9 High Strength Black Nickel-Plated Cup Head Hexagon Screws Cylinder Head Extended Bolts for Industrial Machinery

Our Grade 12.9 High Strength Black Nickel-Plated Cup Head Hexagon Screws (Cylinder Head Extended Bolts) are professional-grade fasteners engineered for heavy-duty industrial applications, equipment assembly, and high-load mechanical installations. As Grade 12.9 high-strength hardware, these screws deliver exceptional tensile strength and shear resistance, making them ideal for scenarios that demand reliable performance under high pressure, vibration, or heavy loads—such as industrial machinery, mechanical equipment, and precision engineering projects.

 

Crafted from high-quality alloy steel and finished with a black nickel plating, these cup head hexagon screws offer dual advantages: superior durability and excellent corrosion resistance. The black nickel coating not only enhances the screws’ resistance to rust, wear, and chemical damage but also provides a sleek, professional appearance, making them suitable for both indoor and outdoor industrial environments, as well as applications where aesthetics and performance are equally important.

 

Designed with a cup (cylinder) head and hexagon drive, these extended screws feature an elongated shank that provides extra length for deep installation needs—perfect for securing thick components, industrial machinery parts, and equipment enclosures. The hexagon drive ensures a secure grip during installation and removal, preventing slipping and stripping, even when applying high torque—critical for heavy-duty applications.

 

Available in three precision sizes (M1.6/M2/M4), these high-strength bolts cater to a wide range of industrial and mechanical needs, from small precision equipment to large industrial machinery. Suitable for professional engineers, mechanics, and industrial maintenance teams, these screws are a reliable choice for assembly, repair, and maintenance of high-load equipment. Whether used in factory machinery, mechanical tools, or precision engineering projects, these Grade 12.9 black nickel-plated cup head hexagon screws deliver consistent, heavy-duty performance you can trust.