High-Strength Black Oxide Hex Screws
Our Grade 8.8 and 10.9 Black Oxide Hex Bolts are engineered for industrial applications where strength, durability, and reliability are non-negotiable. Manufactured from high-strength carbon steel and finished with a protective black oxide coating, these coarse thread hex screws deliver robust performance in demanding environments. Available in an extensive size range from M4 to M22, they are the go-to choice for machinery, construction, automotive, and structural projects.
As a direct manufacturer, we provide comprehensive OEM customization services, tailoring dimensions, specifications, and processes to your exact requirements based on drawings or samples, ensuring a perfect fit for your unique application.
Compared with traditional zinc-plated bolts, Black Oxide Hex Bolts offer:
● low-reflective industrial appearance
● improved wear resistance
● enhanced oil retention capability
● stable performance in industrial applications
Their hexagonal head design allows easy installation using standard tools while maintaining strong torque transmission for secure fastening systems.
High-Grade Mechanical Strength
Performance Guarantee: Grade 8.8 bolts offer a minimum tensile strength of 800 MPa, while Grade 10.9 bolts deliver a minimum tensile strength of 1000 MPa. This clear grading allows you to select the optimal strength-to-weight ratio and safety margin for your specific load-bearing and dynamic stress requirements, from general construction to critical automotive and machinery connections.
Comprehensive Size Range & OEM Flexibility
One-Stop Solution: With a complete offering from M4 to M22, we cover the vast majority of industrial fastener needs. Beyond standard stock, our core service is full OEM support. We can produce:Non-standard lengths and diameters.Specific thread pitches (fine or custom).Special heat treatment or testing requirements.
Applications of Black Oxide Hex Bolts
Black Oxide Hex Bolts are widely used in industries requiring reliable fastening performance and high structural strength.
Typical applications include:
● industrial machinery assembly
● automotive manufacturing systems
● steel structure fabrication
● heavy equipment installation
● construction engineering projects
● OEM production lines
Their high-strength fastening capability makes them suitable for environments where mechanical stability and long-term durability are essential.
As industrial manufacturing standards continue to increase, more procurement teams are selecting Black Oxide Hex Bolts for applications requiring both structural performance and professional industrial appearance. Heavy-duty hex bolt suppliers and structural fastener manufacturers also emphasize their use in construction, machinery, and petrochemical systems.
As an experienced manufacturer of Custom Bolts and industrial fastening systems, Shenghang Hardware focuses on delivering high-performance fastening products for demanding industrial applications.
