UNI 5731-1965 Cup square bolts and bolts with square nut Iso metric coarse thread Finish c 《带宽圆头和带方形螺母的方形螺杆螺栓和螺钉 ISO粗距公制螺纹，取代UNI 883 UNI 884和UNI 905 D C级》.pdf

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