介绍了螺纹紧固件 ,即螺栓、螺钉、螺柱、螺母、垫圈等的标记以及标记中各参数的含义 ,并对新增加的螺纹紧固件以及螺套的简化画法进行对比介绍。 This paper introduces the definition of the screw fasteners, namely the bolts, screws, studs, nuts, washers, etc., and the meanings of the parameters in the markings. It also introduces the simplified drawing method of the newly added screw fasteners and the screwdrivers.