Premium Black Oxide Zinc Plated Hex Bolt Assemblies – Ultimate Strength & Corrosion Resistance Industrial-grade hexagon bolt kits featuring Grade 4.8/8.8/10.9/12.9 steel for load-bearing durability. Black oxide + zinc plating delivers double-layer rust prevention, ideal for outdoor machinery and automotive applications. Pre-assembled with precision-engineered nut, spring washer, and flat washer – eliminates loosening under vibration. Cold-forged heads with sharp hexagonal edges for maximum wrench grip. Perfect for structural steel connections, heavy equipment maintenance, and DIY projects requiring high shear strength. Bulk pricing available for contractors and manufacturers – wholesale quantities shipped globally.
Key Advantages
Multiple strength grades to match project specs Uniform black matte finish for professional aesthetics Spring washers prevent spontaneous unfastening ISO-certified threading for flawless compatibility