Mechanical properties of fasteners made of carbon steel and alloy steel

BS EN ISO 898-5:2012 INTERNATIONAL STANDARD ISO 898-5:2012(E) Mechanical properties of fasteners made of carbon steel and alloy steel — Part 5: Set screws and similar threaded fasteners with specified hardness classes — Coarse thread and fine pitch ......

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《鼻血....》你沒看過的露點照

你看你！鼻血四濺~看到亮點的自己去面壁！...

讓人一看就懂的變態專用告示牌

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