- Hexagon head bolts HH-BO8.8 series are made from carbon steel, then heat treating at high temperature to reach the grade 8.8.
- The bolts are high tensile bolts and are comonly used in positions resisting great force such as heavy machinery. Vibrations in these environments require high tensile bolts or high-grade bolts to bear a high load during working.
- A wrench is an indispensable tool for loosening/tightening hexagon bolts.
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