螺母及螺栓头部简化画出。

The nut and bolt head can be simply drawn as Outlines.

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在安装前螺栓的螺纹及螺母应用防磨损剂包覆。

Threads of bolts and nuts shall be coated before installation with anti-galling agent.

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盲设备口及人孔所用的垫片、螺栓及螺母在买方图纸或数据表中指定。

Gaskets, bolts and nuts for blind nozzles and manholes shall be as specified in Purchaser's drawing or data sheet.

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