Flat head full tooth slotted hexagonal washer head bolt full thread

　　Strength: 25-32HRC Material: Carbon steel, alloy steel

　　Material: medium carbon steel

　　Material description: Chemical composition C (carbon): 0.18-0.23; Si (silicon): ≤ 0.10; Mn (manganese): 0.70-1.00; P (phosphorus): ≤ 0.030; S (sulfur): ≤ 0.035; B (boron): ≥ 0.0005

　　Surface treatment: Blue white zinc

　　Surface treatment content: Function: Rust prevention, decoration, and improved corrosion resistance Applicable materials: Various types of steel parts Coating appearance: Blue white Execution standard: ASTM-B633-98 Not environmentally friendly