Hangchi Company's Structural Steel Bolts are high-performance fasteners specifically designed for critical load-bearing connections in steel structures. The products comply with relevant domestic and international standards and feature long-lasting corrosion protection to ensure a stable friction coefficient and durable weather resistance. This product series has passed national authoritative testing and certification and is suitable for steel structure projects requiring high levels of safety and reliability.
Product Parameters
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Implementation standards |
GB/T 1228 (Chinese 10.9S grade) or ASTM A325/A490 (American standard) |
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Strength grade |
Grade 10.9 (≥1000MPa) or Grade 8.8 (≥800MPa) |
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Main materials |
High-strength alloy steels, such as 35VB and 20MnTiB. |
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Supporting requirements |
It must be used with high-strength nuts and washers of the same grade. |
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Nominal diameter |
Common sizes: M16, M20, M24, M27, M30 |
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Custom length |
Determined based on the total thickness of the connecting plate. |
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Surface treatment |
Dacromet (zinc-aluminum coating) or hot-dip galvanizing |
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coefficient of friction |
The μ value is typically controlled within the range of 0.10-0.14. |
Key Features
High-Strength Grades
We supply high-strength structural bolts that comply with international standards such as ASTM A325/A490 or Grade 8.8/10.9.
High Toughness & Fracture Resistance
The product undergoes a "quenching and high-temperature tempering" heat treatment process. This process ensures that when subjected to dynamic and impact loads, the bolts not only meet the required strength specifications but also effectively absorb energy through their own plastic deformation, improving overload resistance and preventing sudden brittle fracture.
Advanced Surface Treatments
Options include hot-dip galvanizing, Dacromet coating, and geometric rust prevention, all providing durable, long-term corrosion protection for harsh environments.
Complete Matching System
Each bolt is complemented by a full set of heavy-duty hex nuts (HV) and high-strength washers, all matched to the same performance grade to ensure system integrity and simplify procurement.
Company Advantages
● Full-Process Quality Control: Every stage, from raw material procurement to finished goods, undergoes strict inspection by dedicated quality personnel, ensuring full compliance with all required standards.
● Professional Technical Support: Our experts provide comprehensive technical services, including bolt selection assistance, torque value calculation, and on-site installation guidance.
● Extensive Project Experience: With a proven track record in hundreds of large-scale steel structure projects worldwide, we possess a deep understanding of project workflows and on-site construction requirements.
● Strong Supply Capacity: Supported by an annual production capacity of 100,000 tons, we consistently maintain ample inventory of structural steel bolts, guaranteeing a reliable and uninterrupted supply for large-scale projects.
FAQ
Q: How should I choose between ASTM A325 and A490 bolts?
A: ASTM A325 bolts are typically specified for general structural connections, whereas ASTM A490 bolts offer higher strength and are designed for more critical or heavy-duty applications. Our engineering team can provide selection support based on your specific design loads and requirements.
Q: How do you ensure the consistency of quality in large-volume production?
A: We maintain consistent quality in high-volume production through standardized heat treatment processes, complemented by 100% hardness testing and batch-based tensile testing. This rigorous quality control system guarantees the stable and reliable performance of every bolt.
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