本SAE信息报告作为咨询指南提供。建议自行申请。内容已尽可能准确地呈现，但其应用的责任在于用户。本文件涵盖了扭矩-张力关系中的变量:摩擦、材料、温度、湿度、紧固件和配合零件的光洁度、表面，以及使用的扳手类型。此外，本文件还描述了实现正确紧固件接头拧紧所需的扭矩管理。紧固件的螺纹配合必须符合2A级外螺纹和2B级内螺纹的要求。

This SAE Information Report is provided as an advisory guide. Individual application discretion is recommended. The content has been presented as accurately as possible, but responsibility for its application lies with the user. The document covers the variables in the torque-tension relationship: friction, materials, temperature, humidity, fastener and mating part finishes, surfaces, and the kind of wrenching employed.Also, described in this document is the torque management required to achieve correct fastener joint tightening.The thread fit of fasteners must be in accordance with Class 2A for external and Class 2B for internal inch threads.