本SAE标准记录了用于汽车液压制动系统中主要部件互连的具有扩口端、螺纹端口和外螺纹管螺母的液压制动系统管路的尺寸公制规范。 本文件的目的是推荐首选的公制尺寸组件（包括替代选择），这些组件旨在功能上与国际标准化组织规范ISO 4038兼容。一些应用可能需要不同于本文所示尺寸的表格，并且当需要时，本文档不排除此类其他细节。

This SAE Standard documents dimensional metric specifications for hydraulic brake system tubing with flared ends, threaded ports, and male tube nuts for the interconnection of major components in automotive hydraulic brake systems. The purpose of this document is to recommend preferred metrically dimensioned components (including alternative choices), that are intended to be functionally compatible with International Organization for Standardization Specification, ISO 4038. Some applications may require sizes of forms other than those shown herein, and this document does not preclude such other details when they are required.