Metric threads where pressure-tight joints are made on the threads
全国螺纹标准化技术委员会(SAC/TC 108)
本标准规定了牙型角为60°、米制密封螺纹的牙型、基本尺寸、公差和标记。
内螺纹有圆锥内螺纹和圆柱内螺纹两种，外螺纹仅有圆锥外螺纹一种。内、外螺纹可以组成两种密封配合形式：圆锥内螺纹与圆锥外螺纹组成“锥/锥”配合；圆柱内螺纹与圆锥外螺纹组成“柱/锥”配合。
本标准适用于管子、阀门、管接头、旋塞等产品上的一般密封螺纹联结。装配时，推荐在螺纹副内添加合适的密封介质，例如密封胶带、密封胶等。
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