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Kindly bear with us and for enquiries please contact mail@kinlong.com .
4.8級和8.8級是指螺栓(螺絲)的性能等級，它與螺栓的材料沒有關(guān)系， 4.8為低碳鋼，螺絲級別還包括6.8 8.8 10.9 12.9 數(shù)字越大，強(qiáng)度越高，現(xiàn)在國內(nèi)最高就是12.9級螺絲了，屬于高碳鋼！
4.8級的定義為：4代表4*100=400MPa，指螺栓的抗拉強(qiáng)度為400MPa，.8為屈強(qiáng)比值為0.8，公稱屈服強(qiáng)度達(dá)400×0.8=320MPa 8.8級螺栓的性能為：抗拉強(qiáng)度=800MPa，屈服強(qiáng)度=800*0.8=640MPa。
