These flange hex bolts adopt **grade 10.9 high-strength alloy steel** and fully comply with GB5789 standard, featuring outstanding tensile strength, shear resistance and fatigue performance, specially suitable for heavy-duty track and railway fastening working conditions. With one-piece flange design, it replaces independent washers to increase stress area, improve anti-loosening and anti-skid performance, and ensure stable connection under long-term vibration. Both full thread and half thread specifications are available, covering complete sizes from M5 to M24 to meet different assembly needs. Strictly controlled dimensional tolerance and precise thread rolling ensure firm fitting and reliable locking. Widely used in railway tracks, engineering machinery, steel structure installation, mechanical equipment and other heavy-duty industrial fastening scenarios. Each bolt is strictly inspected for hardness, thread accuracy and mechanical properties. Factory direct supply with full specifications in stock, providing professional high-strength flange bolt solutions for global engineering and machinery customers.