Tightening Bolt 8.8 Grade

Technical Parameters:

Grade: 8.8

Material: Medium-carbon steel with added alloying elements like manganese

Tensile Strength: Minimum 800 MPa

Yield Strength: Minimum 640 MPa

Thread Type: Metric threads (M)

Surface Finish: Zinc-plated, hot-dip galvanized, or black oxide (depending on environmental requirements)

Coating Thickness: Zinc plating thickness generally between 5-10 microns; galvanizing up to 50 microns

Diameter Range: Common sizes include M6 to M100, with custom sizes available

Length Range: Customizable, typically from 20mm to 300mm

Corrosion Resistance: Good to excellent, depending on coating

Compliance: ISO 898-1, ASTM A325, DIN 933, and other relevant standards

The manufacturing process of the Tightening Bolt 8.8 Grade involves several key stages to ensure precision, strength, and quality:

Material Selection: The raw material for 8.8 grade bolts is medium-carbon steel, typically alloyed with elements such as manganese to improve hardness and strength. This steel is selected for its excellent mechanical properties.

Forging: The steel billets are heated and forged into the desired shape, typically a cylindrical form. This process aligns the grain structure of the steel, improving its strength and toughness.

Thread Cutting: After the bolt has been formed, threads are cut or rolled onto the shaft. Thread rolling is often preferred as it creates stronger threads and improves the bolt's fatigue resistance.

Heat Treatment: The bolts are heat-treated to achieve the desired mechanical properties. This process typically involves tempering or quenching, followed by controlled cooling to enhance the tensile strength (typically 800 MPa or higher) and the yield strength (around 640 MPa).

Surface Coating: To prevent corrosion and increase durability, bolts are coated with a protective layer such as zinc plating, galvanizing, or black oxide. This helps the bolt resist rusting and ensures longevity in both indoor and outdoor applications.

Quality Control: Each bolt undergoes strict quality checks, including tests for tensile strength, thread accuracy, surface finish, and dimensional precision. Bolts are inspected for conformance to ISO, ASTM, or DIN standards to ensure they meet the required specifications.

The Tightening Bolt 8.8 Grade is widely used in industries where high strength and reliability are critical. Some common applications include:

Construction: Used in building structures, bridges, and other heavy construction applications. The high tensile strength of Grade 8.8 bolts ensures that they can withstand the load-bearing requirements in structural connections.

Automotive: Common in vehicle assembly, where components need to be securely fastened. The bolts are used in engine mounting, suspension, chassis, and other high-stress areas.

Heavy Machinery: In industrial machinery, mining equipment, and oil rigs, 8.8-grade bolts provide the necessary strength to withstand harsh operating conditions and heavy vibrations.

Infrastructure: Ideal for use in the construction of roads, railways, and large-scale public infrastructure projects that require high-strength fasteners to secure critical components.

Marine: Used in the construction of marine vessels and offshore platforms, where corrosion resistance and strength are crucial in the saltwater environment.

Aerospace: Employed in applications where high strength and precision are needed, such as in airplane assembly and other aerospace components.

Energy and Power: In wind turbines, power plants, and other energy-related structures where bolts must endure high tension and fatigue over long periods.

Would you have a discount if l have a large order?
A; Yes we could offer different discount according to your order quantity.

Do you accept custom design on size?
A:Yes, if the size is reasonable

Could you print our company LOGO on the nameplate and package?
A:Yes, we can do that

What is your MOQ? Can I mix different styles to a start order?
A: Please tell us what products you need first.

If l have a product wants to be made in other special material, can you do it?
A:Of course, you just need to provide us designed drawings or sample and R&D department will estimate that whether we can do or not, we will give you the most satisfactory reply.

Can l visit your factory?
A:By all means, we warmly welcome your arrival, Before you take off from your country, please let us know. We will show you the way and arrange time to pick you up if possible.

Do you offer OEM service and can you produce as our drawings?
Yes. We offer OEM service. We accept custom design and we have a professional design team who can design products based on your requirements. And we can develop new products according to your samples or drawing

Can I request to change the form of packaging and transportation?
A: Yes, We can change the form of the packaging and transportation according to your request, but you have to bear their own costs incurred during this period and the spreads.

Can I request to advance the shipment?
A: It should be depends on whether there is sufficient inventory in our warehouse.

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