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铁块度前配重螺栓挖掘机螺丝承重一配重高外六角强12.935三适用3
8.8/10.9/12.935CrMoA黑色GB901双头螺栓制造螺丝金属镀锌生产强
硬质钨钢球合金球12.92/12.925/12.93/12.935/12.94/12.945mm钢珠
600//50120/销钉1070G20*0/内螺纹圆柱销870B级8/55//12.935OIS25