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Property Class 12.9 Hexagon Head Bolts, DIN 933 Property Class 12.9 Hexagon Head Bolts, DIN 933 Property Class 12.9 Hexagon Head Bolts, DIN 933

Property Class 12.9 Hexagon Head Bolts, DIN 933





Property Class 12.9 Hexagon Head Bolts, DIN 933


  • Hydrogen Embrittlement Fracture: Property Class 12.9 steel is highly susceptible to hydrogen embrittlement. Pickling, electro-galvanizing and cadmium plating are strictly prohibited. Black oxide coating / Dacromet coating is recommended as priority alternatives.

  • Low-Temperature Brittleness: Impact strength drops sharply below -20°C. Use with caution in low-temperature environments.

  • Overload Fracture: Tightening torque shall not exceed the recommended value to prevent plastic deformation.

  • Maximum Operating Temperature: Long-term service temperature ≤ 250°C. Excessive temperature will cause temper softening.


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