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Professional-grade hexagon flange bolts engineered to GB5789 standards, available in M5 through M12 sizes. Manufactured from Grade 10.9 steel with black oxide finish for enhanced corrosion resistance and durability. The integrated flange design distributes load more effectively than standard bolts, reducing surface stress and preventing fastener loosening under vibration. Ideal for machinery assembly, structural applications, and heavy-duty fastening where reliability is critical. Each size delivers consistent tensile strength and dimensional accuracy for precision engineering projects.