High Strength Structural Steel Bolted Connections Friction Type ASTM A325 A490

Product Specification

Product Description​:
A Friction-Type High-Strength Bolted Connection is a seismic and dynamic load-resistant structural joining solution that offers excellent stability, traceability, and prefabrication compatibility. This product is designed using ASTM A325/A490 grade high-strength bolts, paired with sandblasted friction surfaces (friction coefficient ≥0.45), ensuring reliable load transmission through friction for critical buildings in high-seismic zones.​
One of the key features of this connection is its superior seismic performance—relying on bolt preload to generate friction, it achieves zero slip deformation under dynamic loads (earthquakes, vibrations), making it suitable for hospitals, nuclear power plants, and other critical buildings in seismic intensity zones 7-9. Customers can benefit from its high prefabrication rate: modular design supports factory prefabrication with an error control of ±1mm, avoiding damage to structural strength from welding heat-affected zones.​
For enhanced safety and maintainability, the Friction-Type High-Strength Bolted Connection allows post-installation inspection and maintenance via torque wrenches, ensuring traceability of connection quality. Its surface treatment (hot-dip galvanizing) provides corrosion resistance, adapting to various environmental conditions from industrial workshops to coastal buildings.​
With its balanced design of rigidity and flexibility, this connection is easy to assemble on-site, reducing construction time by 30% compared to traditional welding. Whether it's for seismic-resistant frame structures, vibration-prone equipment foundations, or large-span public buildings, this product delivers a stable and efficient solution.​
Customers can rely on the professional technical support provided, including pre-project friction coefficient testing and on-site installation guidance. The team is committed to ensuring that each connection meets design standards, helping customers achieve structural safety and project success.

Applications​:
Friction-Type High-Strength Bolted Connections are seismic-focused joining solutions widely used in critical buildings and dynamic load scenarios. Certified by ISO 898-1 and ASTM A325/A490, they ensure compliance with international quality and safety standards, making them a trusted choice for high-stakes projects.​
These connections are suitable for diverse applications, including hospitals, nuclear power plants, and high-rise residential buildings in seismic zones, as well as vibration-prone structures like wind turbine towers and industrial crane runways. The minimum order quantity is 5 sets for standard specifications, and customized solutions are available for special friction coefficient requirements, catering to both small maintenance projects and large-scale engineering.​
The competitive pricing and short delivery time (5-10 workdays for standard orders) make them ideal for tight-schedule projects. Flexible payment terms (T/T, L/C) and bulk supply capacity (300,000 sets/month) ensure that customer demands are met promptly, even for urgent seismic reinforcement projects.​
With a service life of over 40 years, these connections provide long-term structural stability, reducing maintenance costs for customers. The sandblasted friction surface and hot-dip galvanizing treatment ensure adaptability to harsh environments, from humid coastal areas to industrial zones with heavy pollution.​
Customization options include friction surface coefficient adjustment (0.45-0.60) and bolt length modification, allowing tailored solutions for specific project needs. Whether it's for new construction or old structure reinforcement, the Friction-Type High-Strength Bolted Connection delivers reliable seismic and dynamic load resistance.