There are all tire/wheel bolts and their are use to auto part. Material: 40Cr,42CrMo. Technics:hot/cold forging-lathes-hot treatment-grinding-rolling-plating. Grade:10.9~12.9(HRC 32-39~HRC 38-44). Tensile strength:106.1 kg/mm2~124.5 kg/mm2. Finish:blackening;plating-Zinc;dacromet. Weight:1-0.6 KG/PCS.
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