(4PCS):There is hexagonal head bolt and it is use to auto part. Material: 40Cr,42CrMo. Specification:5/8-18*81 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. Weight:0.258 KG/SET(NUT-0.034KG/PCS,WASHER-0.016 KG/PCS)
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