鋼結構大六角螺栓 High-Strength Hexagon Bolts with Large Widths Across Flats for Structural Bolting
預負載用高強度結構螺栓連接副,第4部分:HV系統 - 六角螺栓 High-strength Structural Bolting Assemblies for Preloading - Part 4: System HV - Hexagon bolts
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