China is the world's biggest producer of screws, nuts, bolts and washers, while the EU is its biggest market.

中国是世界上最大的螺丝钉、螺母、螺栓和垫圈生产商，而欧盟是这些商品的最大市场。

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These indications shall not be placed on screws, removable washers or other parts which can be removed when conductors are being connected.

这些表示符号不应放在螺钉、可取下的垫圈或在连接导线时能被取下的其他部件上。

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Parts with threads used for joining and fastening are called screw fasteners. The most widely used components as screw fasteners are bolts, double screw bolts, screws, nuts, washers.

用螺纹联接并起紧固作用的零件称为螺纹紧固件。常用的螺纹紧固件有螺栓、双头螺柱、螺钉、螺母、垫圈等。

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