
Countersunk Head 316 Stainless Steel Hollo Box Bolt Expansion Bolt for Structural Steel. Blind Side Installation: Allows secure connection from one side only, ideal for structural hollow sections. High Clamping Force: 5-part HCF version available for 5/8" and 3/4" sizes for higher strength connections. Multiple Head Options: Choose Hexagonal, Countersunk, or Flush Fit heads for varied architectural aesthetics. Superior Corrosion Resistance: Available in Zinc Plated, Hot-Dip Galvanized, Sheraplex, and Stainless Steel. Full Customization: Supports OEM and ODM services with full customization options for specific needs. High Quality Assurance: 100% inspection including function and visual checks by 3 dedicated QA inspectors. Fast Lead Time: Average lead time within 15 workdays for both peak and off-season periods. Large Inventory Support: Maintains over 100 tons of spot inventory to ensure quick delivery availability.