According to ISO 898-1, Mechanical ₽↑₹pr physical property®>∏♣ for class 12.9 is as below:

Tensile strength min 1220 MPa≈≥↓

Stress at 0.2% non-proportional elonβ∏↓gation, Rp0.2, min 1100 MPa

Stress under proof load​↕→, 970MPa

percentage elongation of¥δ≥ area after fracture for≤∏ machined test pieces, AΩ¥‌✘,  8%

Percentage reduction of>∑ area after fracturer for ma±β<chined test piece, Z,&ε​nbsp; 44%

Vickers hardness, HV, •↑π385 ~ 435

Surface hardness, HV0.3, 435

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