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Grade 8.8/10.9/12.9;
Black Oxide, Phosphate, Zinc Coating

1.  QUALITY: Grade 8.8, 10.9, 12.9 .

2.  SURFACE PROTECTION: Black oxide with Protective Oil, Phosphate (Grey),
                                           Zinc Coating (Yellow/Silver) and Dacromet (Sliver).

3.  MATERIAL: 45#, 40Cr, 35Crmo (SAE1045, SAE5140, SAE4135) .