Fujian High Strength Fastener

QS Fastener: Fujian High Strength Fastener

Name: Fujian High Strength Fastener
Material: A193 B7, A194 2H
Standard: ASTM
Class: 8.8
Surface: PTFE
Feature: High Yield Strength and Durable Strength

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This High Strength Fastener complies with ASTM standards. The screw material is A193 B7 alloy steel, and the nut material is A194 2H carbon steel. Its mechanical performance reaches Class 8.8. The product features excellent high yield strength and long-lasting durability. The surface is treated with PTFE coating, which not only provides outstanding corrosion resistance but also effectively reduces installation torque. It is widely used in harsh working conditions that demand high connection reliability, such as petrochemical, pressure vessel, and heavy machinery applications.

What is a High Strength Fastener?

A High Strength Fastener typically refers to bolts, screws, studs with a property class of 8.8 or above, or nuts of class 8 or above. These are the"premium products"among fasteners, used in critical applications where connection strength, reliability, and safety are paramount.

Simply put, the"strength"of a High Strength Fastener is quantifiable. The property class of a bolt (e.g., 8.8, 10.9) is its core identifier, with the numbers representing specific mechanical properties:

Property Class	Nominal Tensile Strength	Nominal Yield Strength	Interpretation
Class 8.8	800 MPa	640 MPa	The"entry level"of High Strength Fastener, far superior to ordinary bolts.
Class 10.9	1000 MPa	900 MPa	A common grade with higher strength, used in more demanding connection environments.
Class 12.9	1200 MPa	1080 MPa	An ultra-high strength grade for applications with special requirements.

Note: The meaning of the class numbers is internationally standardized. For example, for Class 8.8, the first"8"represents a tensile strength of 800 MPa, and the second"8"represents a yield ratio of 0.8; multiplying them gives the yield strength of 640 MPa.

🏗️ Main Features and Key Applications
The strength of a High Strength Fastener comes from the dual guarantee of material and process: they are typically made of high-quality alloy structural steel or special alloy steel, and undergo strict heat treatment processes such as quenching and tempering to achieve mechanical properties far superior to ordinary carbon steel (e.g., Q235).

Thanks to their outstanding strength and reliability, High Strength Fastener is widely used in:
- Large steel structure projects: such as offshore drilling platforms, bridges, stadiums, and steel beam connections in high-rise buildings.
- Major equipment manufacturing: such as construction machinery, rail transit vehicles, and fixing critical components of large ships.
- Energy and transportation facilities: such as wind power tower sections, high-voltage equipment, and petroleum pipeline flange connections.

💡 Selection and Usage Tips
If you need to select or use a High Strength Fastener, you may consider the following points:
1. Check the marking: Genuine products will have the property class clearly marked on the bolt head or nut side (e.g.,"8.8","10.9"). This is the most direct way to identify them.
2. Match components: Bolts and nuts should be used with matching grades. For example, a Class 8.8 bolt should be paired with a Class 8 nut. Do not mix incompatible grades.
3. Request quality certification: When purchasing, ask the supplier for the Product Quality Certificate as a basis for quality traceability.

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