These grade 8.8 hex bolts conform to GB5783 standard, made of high-strength carbon steel with color zinc plating for excellent anti-rust and anti-corrosion performance. Featuring full thread design, they have high tensile strength, stable fastening force and reliable anti-loosening ability under vibration, suitable for heavy-duty mechanical and construction applications. Strictly inspected for dimensional accuracy and hardness, they are widely used in steel structures, machinery assembly, equipment fixing and engineering installation. Available in complete specifications with factory direct supply, providing cost-effective high-strength fastening solutions for industrial users.