High Strength Black Oxide Hex Screws - China

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.

Company Contact:

• Posted By: Dongguan Shenghang Technology Co., Ltd.

• Phone: 0769-82971648

• Address: No. 535 Futong Road, Yangkengtang Village,Dalang Town, Dongguan , Guangdong , China

• Email:

• Business Description: Dongguan Shenghang Hardware Co., Ltd., abbreviated as "Shenghang Hardware", is located in Dongguan, Guangdong Province, China.
  
  We are a company that integrates research and development with sales, specializing in the production of non-standard special hardware screws, nuts, bolts and hardware fasteners for 20 years.
  
  Our factory covers an area of 3000 square meters, and all production activities are concentrated in this self owned factory to ensure efficient management and rapid response.
  
  Building area: 2000 square meters; Production area: 1500 square meters; Warehouse and quality control area: 500 square meters
  
  We are a Lean and Professional Team with a Total of 35 People, Structured as Follows:
  
  ● Production and operation team (10 people): Experienced masters and skilled technicians work together to directly control equipment, which is the first line of defense for product quality.
  
  ● Technical and Engineering Team (9 people): Among them, 4 senior technical personnel are responsible for tackling complex processes and scheme design, while the rest are responsible for programming, drawing conversion, and production support.
  
  ● Quality Management Team (3 people): Responsible for the full process inspection from feeding to shipping.
  
  ● Management and Support Team (9 people): including 4 core management personnel and 5 support personnel responsible for logistics, procurement, and administration, to ensure the efficient and orderly operation of the company.
  
  ● Small and specialized, quick response: The team structure is flat, with a short decision-making chain and efficient communication from receiving requirements to technical evaluation and production scheduling.
  
  ● Emphasis on experience and energy: The core technical personnel have over 10 years of industry experience and can accurately predict production difficulties.
  
  Frontline employees are full of energy and can ensure stable output efficiency.