新的紧固件国家标准尽管早已在1985年、1986年就颁布了，但由于在新老标准的过渡中存在种种困难，所以一直未能很好地贯彻，随着四化建设的发展、对外技术交流和国际贸易日益增长、标准必须与国际接轨、并达到或接近国际先进水平，同时为提高紧固件技术、并配合主机的升级换代 Although the new national standards for fasteners were already promulgated in 1985 and 1986, they have not been well implemented because of the difficulties in the transition of old and new standards. With the development of the four modernizations, foreign standards Technology exchange and international trade is growing day by day, the standard must be in line with the international standards and reach or approach the international advanced level. At the same time, in order to improve the fastener technology and cooperate with the upgrade of the host computer