Fracture analysis of screw fastener was carried out by means of metallography and scanning electron microscope.

采用光学显微镜、扫描电镜等测试手段，对断裂紧固螺钉进行了分析。

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The invention generally relates to a drive socket and more particularly to an improved drive socket design for fixation and a screw fastener.

本发明一般地涉及驱动套头，并且更具体地涉及用于固定及螺丝紧固件的经改进驱动套头设计。

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Bolted joints can be readily disassembled and reassembled; hence Bolts or screw fasteners are used more than other types of mechanical fastener.

螺栓连接易于装、拆；因此，螺栓或螺纹件紧固件较其它机械扣件用得更广。

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Last fall, Deputy Secretary of Labor Seth Harris visited the Pilgrim Screw Corporation, a fastener manufacturing firm that used work sharing to avoid laying off 35 workers in their Rhode Island facility.

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