为便于使用者了解紧固件专业化生产的情况,尽量集中选用某些品种和规格,使之有利于专业化生产,同时也为紧固件专业生产厂考虑发展生产时提供依据,故汇编优先选用的国家标准紧固件。 In order to facilitate users to understand the situation of specialized production fasteners, as far as possible focus on the selection of certain varieties and specifications, so that it is conducive to specialized production, but also for the professional production of fasteners to consider the development of production to provide a basis, the compilation priority Selection of national standard fasteners.