Hardened Steel J-metal Bolt Anchor Fastener M27 with Mechanical Galvanized Coating for Bridge Construction Projects

Hardened Steel J-metal Bolt Anchor Fastener M27 with Mechanical Galvanized Coating for Bridge Construction Projects
 
 
 
1,Description:

Bolts serve as fundamental fastening elements in the construction industry, performing critical functions that ensure structural integrity, safety, and durability across diverse building applications. Their primary role involves connecting structural members such as steel beams, columns, trusses, and concrete elements, effectively transferring loads and forces throughout the building framework. In steel construction, bolts create rigid or semi-rigid joints that resist shear forces, tension loads, and bending moments, enabling the structural system to behave as a unified entity under various loading conditions including gravity, wind, seismic activity, and live loads.

Beyond structural connections, bolts fulfill essential functions in non-structural applications including facade attachment, equipment mounting, railing installation, and temporary bracing during construction phases. Foundation bolts, such as J-bolts and L-bolts, anchor structural columns and heavy machinery to concrete bases, preventing uplift and lateral displacement. Anchor bolts embedded in concrete transfer overturning moments and tensile forces from superstructures into foundation elements, ensuring overall building stability.
2,Applications:
Grade 8.8 bolts: tensile strength 800 MPa, yield strength 640 MPa. Suitable for non-extreme load environments such as construction machinery and general industrial assembly, offering good value for money and versatility. They are typically manufactured from medium-carbon steel that has undergone quenching and tempering, such as 20MnTiB. Grade 10.9 bolts: Tensile strength 1000 MPa, yield strength 900 MPa. Commonly used in critical structural components such as automotive applications, bridge construction and high-speed rail, meeting the demands of dynamic loads and high fatigue strength. The manufacturing process is more demanding, and they are generally produced from low-alloy steel (such as 35CrMo) following heat treatment. Grade 12.9 bolts: Tensile strength of approximately 1200 MPa, yield strength of 1080 MPa. These are among the highest-performance carbon steel high-strength bolts currently available on the market. They are commonly used in hydraulic equipment, high-pressure valves, heavy machinery and the mould industry, where they must withstand extremely high loads or impact loads. The manufacturing process involves deep quenching and tempering, as well as ultrasonic testing, to ensure a balance between strength and stability.
When designing engineering solutions or carrying out maintenance, it is crucial to select bolts with the appropriate performance grade based on factors such as load, operating environment and budget. For example:
Building Structures: Grade 8.8 bolts are generally used for steel structure connections, offering long-term durability.
Engines and Transmission Systems: Grade 10.9 or 12.9 bolts are recommended to ensure fastening requirements are met during high-speed vehicle operation. Automotive Manufacturing: Industrial Equipment: Grade 12.9 bolts are recommended for heavy-duty hydraulic machinery and pressure vessels to withstand high-impact forces and high-pressure environments. It is important to note that whilst Grade 12.9 offers higher strength, its machining, cost and tempering stability are more complex; in non-essential applications, it may actually be less practical than Grade 8.8. Therefore, a comprehensive assessment is required during the design phase.

Available in small packing, carton packing, or pallet configurations to meet your shipping and storage requirements.

Manufacturer Information

Manufactured by JIA SHAN Hardware Company with strict quality control measures and pre-shipment inspection.