GB/T 9145-2003 in English

《GB/T 9145-2003普通螺纹 中等精度、优选系列的极限尺寸》由TC108（全国螺纹标准化技术委员会）归口，主管部门为国家标准化管理委员会。
本标准依据GB/T9144-2003的系列和GB/T197-2003的基本偏差和公差，规定了中等精度、优选系列普通螺纹中径和顶径的极限尺寸。普通螺纹的基本牙型符合GB192-2003的规定，适用于一般用途的机械紧固螺纹联接，其螺纹本身不具有密封功能。

Scope

Based on the series of GB/T 9144-2003 and the basic deviations and tolerances of GB/T 197-2003, this standard stipulates the limit dimensions of pitch diameter and top diameter of medium-precision and preferred series of ordinary threads (general-purpose metric threads). The basic profile of ordinary threads complies with the provisions of GB/T 192-2003. This standard is applicable to mechanically fastened threaded connections for general purposes, and the threads themselves do not have a sealing function.