本标准描述了耳后助听器耳挂喷嘴的首选螺纹。需要这样一个标准 这是由于助听器分配器需要库存各种各样的耳挂，以利用不同的耳挂 几家制造商生产的耳后助听器。

This standard describes a preferred thread for earhook nozzles on postauricular hearing aids. The need for such a standard arises from the wide variety of earhooks that hearing aid dispensers are required to keep in inventory to utilize different postauricular hearing aids from several manufacturers.