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Durable Black Surface Allen Bolt 10.9 Grade for Heavy Us. High Strength Grade 10.9: Manufactured from carbon steel with a 10.9 grade rating for heavy-duty applications. Durable Black Finish: Features a black surface treatment for enhanced corrosion resistance and aesthetic appeal. Versatile Size Range: Available in Allen Bolt sizes ranging from M6 to M20 to fit various machinery needs. Multiple Standard Compliance: Meets DIN, GB, and BSW standards, ensuring compatibility with international specifications. Wide Application Scope: Suitable for machinery, chemical industry, environmental projects, and building construction.