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Grades of High Tensile Bolts?

Grades of High Tensile Bolts?

In the realm of fasteners, high tensile bolts stand tall for their exceptional strength and reliability. These bolts are categorized into different grades, each denoting a specific level of tensile strength, making them vital components across industries where structural integrity is paramount.

Understanding Grade Classification

High tensile bolts are classified based on their material composition, heat treatment, and mechanical properties, typically identified by a set of numbers such as 8.8, 10.9, or 12.9. These numbers signify the bolt’s grade, with the first number representing the ultimate tensile strength (UTS) in MPa, and the second representing the yield strength ratio, also known as the proof load.

Common Grades of High Tensile Bolts

1. Grade 8.8: Bolts in this grade possess a minimum tensile strength of 800 MPa and a yield strength of 80% of the tensile strength. They are commonly used in general engineering applications, automotive, and construction where moderate strength is sufficient.

2. Grade 10.9: Bolts in this grade exhibit a minimum tensile strength of 1000 MPa and a yield strength equivalent to 90% of the tensile strength. They find applications in structural and machinery components where higher strength and reliability are required.

3. Grade 12.9: These bolts boast a minimum tensile strength of 1200 MPa and a yield strength of 90% of the tensile strength. They are utilized in critical applications such as automotive engines, aerospace, and heavy machinery, demanding superior strength and durability.

Selecting the Appropriate Grade

The choice of grade depends on the specific application, load requirements, environmental conditions, and safety standards. Engineers and manufacturers assess the stress and load-bearing needs to determine the suitable grade of high tensile bolt required for a particular project or application.

Industry Standards and Testing

Standards such as ISO 898 and ASTM A325/A490 outline the requirements and testing methods for high tensile bolts. These standards ensure that bolts meet specified criteria for mechanical properties, dimensions, and performance, providing assurance of quality and reliability.

Considerations for Installation and Maintenance

  • Proper Torque: Bolts should be tightened to the specified torque to ensure optimal clamping force without overloading or under-tightening.
  • Inspection and Replacement: Regular inspections are crucial to detect any signs of wear, corrosion, or fatigue. Bolts showing signs of degradation should be promptly replaced to maintain structural integrity.


Grades of high tensile bolts play a pivotal role in determining their strength and suitability for various applications. Understanding the distinctions between these grades empowers industries to make informed decisions, ensuring that the right bolts are used in critical structures and machinery. Adhering to industry standards, coupled with proper installation and maintenance practices, ensures the reliability and safety of high tensile bolts, contributing to the robustness and longevity of our built environment.

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Each Stainless Steel High Tensile Bolt is otherwise designed based on the characteristics of the applying and additionally the pressure. Consequently, different industries use different High Tensile Bolt. We also produce customized High Tensile Bolt Products at our factory as per our client’s requirements. For any types of High Tensile Bolt Fasteners Price List Call on +91 9152160158 or drop an Email to |

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