1.1 本规范提供了标准尺寸要求，用于在实际范围内获得普通实验室和工业应用的旋塞阀和塞子的互换性。它仅涵盖地面的尺寸互换性，不涉及项目的设计特征，除非另有说明。 附注1: 关于旋塞和塞子的尺寸取自美国商业标准CS 21。商务部。 附注2: 尽管玻璃是旋塞阀和塞子最常用的材料，但也可以按照规定使用其他材料。由玻璃制成的旋塞阀和塞子应符合规范 E438 和 E671 . 1.2 本国际标准是根据世界贸易组织发布的关于制定国际标准、指南和建议的原则的决定中确立的国际公认的标准化原则制定的贸易壁垒委员会。

1.1 The specification provides standard dimensional requirements for obtaining, within practical limits, interchangeability in stopcocks and stoppers for ordinary laboratory and industrial applications. It covers dimensional interchangeability of the ground surfaces only and does not involve design characteristics of the item except where specified. Note 1: The dimensions pertaining to stopcocks and stoppers were taken from the Commercial Standard CS 21 of the U.S. Department of Commerce. Note 2: Although glass is the most commonly used material for stopcocks and stoppers, other materials may be used as specified. Stopcocks and stoppers constructed from glass should conform to Specifications E438 and E671 . 1.2 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.