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Factory Driect Sales Allen Bolt 12.9 Grade Black Surface. High Strength Grade 12.9: Manufactured from carbon steel with a 12.9 grade rating for superior tensile strength. Versatile Standard Compliance: Meets DIN, GB, and BSW standards for broad industrial compatibility. Wide Size Range: Available in Allen bolt sizes ranging from M6 to M20. Durable Black Finish: Features a black surface finish for corrosion resistance and aesthetic appeal. Multi-Industry Application: Suitable for machinery, chemical industry, environmental, and building sectors. Direct Factory Sales: Sold directly from the factory in Handan, ensuring competitive pricing.