Hardware & Tools
Structural Steel Bolt
Certifications
GB/T1228-1231GB 50205-2001
Description
This product is a Chinese standard GB/T1228～1231 heavy-duty high-strength bolt, nut, and washer connection pair for steel structures, suitable for friction-type connections in long-span bridges, large steel roofs, power plant boiler steel structures, etc. Available in M12 to M30, performance grades 10.9S and 8.8S, with torque coefficient test instructions and construction specifications.
Specifications
| Pitch | 1.75-3.5 |
| Elongation | ≥10% (10.9S), ≥12% (8.8S) |
| Shrinkage Rate | ≥42% (10.9S), ≥45% (8.8S) |
| Tensile Strength | 1040～1240 MPa (10.9S), 830～1030 MPa (8.8S) |
| Thread Specification | M12-M30 |
Get a Quote for This Product
100% Refund Guarantee24h Response100K+ Verified FactoriesYour data is safe
Free China Sourcing Guide
Learn how to find reliable factories, avoid scams, negotiate prices, and manage quality -- all from our years of on-the-ground experience in Ningbo.