标准编号：ISO 68-2:2023
中文名称：ISO一般用途螺纹 基本和设计牙型 第2部分：英制螺纹
英文名称：ISO general purpose screw threads — Basic and design profiles — Part 2: Inch screw threads
发布日期：2023-10
标准范围
This document specifies the basic and design profiles for ISO inch screw threads (UN and UNR). UN applies to both internal and external threads. UNR only applies to external threads. A flat or rounded root contour, due to the threading process, is specified for UN threads, while only a defined rounded root contour is specified for UNR external threads. This document is applicable to the inch fastening screw threads.
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