Black Oxide Carbon Steel Square Head Bolt

• Material: Carbon steel grade 4.8, 8.8, 10.9, 12.9
• Size: M5~M20
• Non-standard
• Other surface treatment is available
• Product description: Black Oxide Carbon Steel Square Head Bolt is from Fast Hardware Electronic Co., Limited which is a professional Black Oxide Square Head Bolt, Carbon Steel Square Head Bolt, Square Head T Bolt, High St
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