What Are High Tensile Bolt Grades?
Are you new to the world of bolts and fasteners? If that is the case, you are in the right place. Bolts or fasteners are used to join two unthreaded objects. They are specific types of fasteners that can withstand high tension and stress levels.
Tensile strength means the material’s ability to resist forces without deforming or breaking. When purchasing bolts, you must ensure that you are purchasing the right type with the right tensile strength.
To help you search, below is a detailed guide about high tensile bolt grades, why you solidly use them, etc.
Understanding The Tensile Strength Of A Bolt
The tensile strength of a bolt means the maximum stress the bolt can take before it breaks. Usually, high-tensile bolts are used for high-stress applications. For example, they are usually used in industrial or construction sectors.
With the help of high-tensile bolts, it becomes easy to secure heavy objects. Over the years, there has been demand for high tensile bolt grade India, as industrialization and infrastructure are developing quickly. That is why high tensile fasteners manufacturers in India play a crucial role in infrastructure projects and manufacturing sectors.
One should not compromise on quality, and to this one such name, Bhansali Techno Components ensures that quality is its top priority, and they provide high tensile bolts that meet the industry standards. High tensile bolts ensure that several applications’ structural reliability and integrity are intact.
But what are the different tensile strengths of Bolts? Let’s find out.
Different High Tensile Strength Bolt Grade
Regarding the high tensile bolts grades, there are usually four main types; of course, there are some other specialist grades, too. The below table will give you more details.
| Grade | Material | Tensile Strength (MPa) | Yield Strength (MPa) |
|---|---|---|---|
| 2 | Low carbon steel | 90 | NA |
| 5 | Medium carbon steel | 120 | 92 |
| 8 | Medium carbon alloy steel | 150 | 130 |
| 8.8 | Medium carbon steel | 800 | 640 |
| 9.8 | Medium carbon steel | 900 | 720 |
| 10.9 | Alloy steel | 1040 | 900 |
| 12.9 | Alloy steel | 1220 | 1080 |
| 14.9 | Ultra-high strength steel | 1400 | 1236 |
Grade 8.8 Bolts
These high-tensile bolt grades are made up of steel, and they are usually plated with several coatings. Grade 8.8 bolts are also known as structural grade bolts. When they are used in real-world settings, they are tightened with a torque wrench.
Grade 10.9 Bolts
They are also known as car bolts. As suggested by the name, they are used mostly in the automotive industry. Their high tensile strength is 1040 MPa, and they are made up of carbon steel or boron.
Grade 12.9 Bolts
These bolts have high strength, which is why they are used in the construction and manufacturing industries. They are quite popular in the automotive industry, as they are used to join engines. They are also used to join medium to heavy industrial components.
Grade 14.9 Bolts
Due to their durability, they are used to join large structural elements. They have a high tensile strength of 1400 MPa. They are largely used in the construction industry.
Grade 2 Bolts
They are usually made up of low or medium-carbon steel, and they are used for noncritical applications and joints.
Grade 5 Bolts
They are composed of medium carbon steel that has been heat-treated to increase their strength. Also referred to as medium-strength fasteners, grade 5 fasteners are utilized in the automotive and construction sectors.
Grade 8 Bolts
They are made up of medium carbon alloy steel. Since they are heat-treated and made up of high-strength alloy, they are extremely durable, and they can endure high stress.
When To Use High-Tensile Bolts
As you have seen above, high-tensile bolt-grade fasteners are used in several industries due to their superior durability and strength. Below are examples of the role of high-tensile fasteners:
Structural Applications
They are used in the construction of buildings and bridges for the long life of the structure.
Heavy Equipment And Machinery
The machines used in industries such as agriculture and mining use high-tensile bolt-grade fasteners. In these types of machinery, vibration, and high-stress levels are also a factor.
Aerospace And Qutomotive
In the aerospace and automotive industries, there are high levels of vibration and stress, so these sectors also rely on high-tensile bolts due to their capability to handle high stress.
Marine Applications
High-tensile bolt-grade fasteners are also used in marine and offshore applications. Here, high levels of tension, vibration, and stress require a strong fastening.
How To Identify High Tensile Bolt?
You can identify high-tensile bolts in several ways. However, one way to be always assured of the quality is to always opt for reliable precision components manufacturers. However, some common ways to identify these bolts are:
Check The Markings
Most often, the high tensile bolt grade fasteners have markings indicating their grade and other characteristics. For example, a bolt that has a marking of 10.9 indicates that it has a minimum tensile strength of 1000 N/mm².
Thread Pitch
The high tensile bolts have fine thread pitch, which helps in increasing their holding power and strength. Thread pitch also reduces the chances of becoming disengaged or vibrating.
Color Coding
Some of the high tensile bolts are color-coded also; this helps in identification. For example, a yellow finish usually donates a bolt that has a tensile strength of a minimum of 1200 N/mm².
Factors To Consider When Picking A High-Tensile Bolt
To ensure that the structure, constructions, etc., are secure, picking the right high-tensile bolt plays a crucial role. Several factors are considered, and below are some of the factors that you must not ignore:
Understand The Load Requirements
Whenever you have to pick a bolt strength, firstly, you must know how much stress and load the bolt has to ensure. As you have seen above, different grades have different tensile strengths; the more the load, the more the tensile strength will be required.
Temperature Conditions
If you are using the bolts/fasteners for applications where there will be temperature variations, such as aerospace, you have to ensure that the bolts can withstand the temperature changes and maintain their integrity.
Corrosion Resistance
Another vital factor is the corrosion resistance. You must consider the fact that what will be the severity of corrosion; if there are high chances, then you can opt for stainless steel bolts.
Industry Standards
Always follow the industry standards and follow the specification allotted by the authorities. To ensure that you are compliant, you can always consult professionals.
Conclusion
Summing up, high-tensile bolt-grade fasteners play a crucial role in maintaining structural integrity in several applications. Since these bolts are divided into different grades, it is vital to have a proper understanding of different tensile strengths. This ensures that the machines or structures are reliable and safe.
Are you looking for a high-tensile bolt manufacturer for a different-grade bolt? Bhansali Techno Components is one of the quality high-tensile fastener manufacturers in India. We manufacture and supply all over the world.
Contact us for more details and quality precision components.
