Product name: Flat head hexagonal bolt
Size: M3-M20
Level : 10.9
Material: 40Cr/35Crmo
Surface treatment: black
Standard : GB/T 70.2-2008
Certificate: ISO 9001
Usage: Internal hexagonal bolts are widely used in fields such as mechanical manufacturing, building structures, automotive industry, power equipment, shipbuilding, bridge engineering, and chemical engineering
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