ONORM ISO 4759 Teil 1-1981 Tolerances for bolts screws and nuts with thread diameters ≥ 1 6 mm to ≤ 150 mm product grades A B and C《螺纹直径≥1 6 mm 至≤150 mm 螺栓、螺钉和螺母的公差 产品等级为 A、B 和 C》.pdf

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