High tensile screws are used in structural and mechanical assemblies where high strength and reliable fastening are required. Manufactured in accordance with international standards, these screws are available in different strength grades and surface treatments to suit various service environments. Customization of non-standard specifications, special materials, and anti-loosening structures is available to meet specific project requirements.
Product Parameters
|
Product Name |
High Strength Bolt / High Strength Screw |
|
Available Sizes |
M3 - M30 |
|
Surface Treatment |
Black Oxide |
|
Material Grade |
35CrMoA (Chromium-Molybdenum Alloy Steel) |
Key Selling Points
Material and Strength Grade
The products mainly use alloy steel materials such as 35CrMo and 42CrMo, which offer superior performance compared to ordinary carbon steel.
Strength grades of 8.8, 10.9, and 12.9 are available, corresponding to specific tensile strength and yield performance, facilitating engineering selection and standardized applications.
Manufacturing and Heat Treatment Process
After forming, the screws undergo standardized quenching and high-temperature tempering treatment to ensure a uniform and stable internal structure. This guarantees high strength while maintaining good toughness, effectively reducing the risk of brittle fracture and fatigue failure.
Surface Treatment and Corrosion Resistance
Depending on the application environment, various surface treatments are available, including blackening, galvanizing, Dacromet coating, and hot-dip galvanizing. Dacromet and hot-dip galvanizing offer excellent corrosion resistance .
Quality Control and Certification
The products undergo batch management from raw material procurement and manufacturing to finished product inspection.
Each batch of products can be provided with material certificates and mechanical performance test reports conforming to EN 10204 3.1 standard, meeting international certification requirements such as ISO and CE, ensuring traceability of quality.
Applications of High Tensile Screws
Rail Transit and Critical Infrastructure
Key fasteners for high-speed rail track fastening systems, locomotive bogies, and large port cranes.
Heavy Engineering Machinery and Equipment
Load-bearing structural connections for mining machinery, large excavators, and crawler cranes, and critical flange connections for pressure vessels.
Heavy Steel Structures and Bridges
Rigid connections for large-span buildings such as stadiums and airport terminals, and beam-to-column connections and splices for steel bridges.
New Energy and Power Facilities
High-strength bolted connections in wind turbine towers, large transmission and distribution tower nodes, and heavy substation structures.
Full-Process Quality Assurance
Reliable Raw Materials
Product raw materials are traceable, and undergo spectral analysis upon arrival.
Process Monitoring
Heat treatment furnace temperature curves are recorded in real time, and hardness is checked through 100% online sorting or batch sampling.
Final Inspection
Key indicators such as dimensions, surface finish, mechanical properties, and torque coefficient are fully inspected or sampled according to AQL standards.
Documentation Package
EN 10204 3.1 material certificates, mechanical performance test reports, and coating inspection reports are provided with the shipment.
FAQ
Q: How to choose between Grade 10.9 and Grade 12.9 bolts?
A: Grade 10.9 is the general choice for heavy-duty structures (such as steel structure connections). Grade 12.9 has extremely high strength but relatively lower toughness, and is mainly used in situations with extreme space and weight limitations and where very high static loads are applied. It is not suitable for situations involving severe impact or fatigue loads.
Q: Can you customize bolts to meet our project's specific requirements?
A: Of course. We can customize high-strength bolts with special specifications, materials, and surface treatments based on your drawings or technical requirements.
Q: Are there any special requirements during installation? Could it break?
A: A torque wrench must be used, and it must be tightened to the recommended torque value. Although it is strong, excessive over-tightening (beyond the yield point) can still cause it to break.
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