Built-in sleeve D1 internal thread detection no-go gauge

An embedded sleeve D1 internal thread detection no-go gauge comprises a handle and a thread body which are arranged at the two ends respectively, an external thread is arranged at the end, away from the handle, of the thread body, the external thread is used for detecting the working face of the internal thread of the embedded sleeve D1, and the radius R of the position, making contact with the internal thread, of the external thread is designed according to the diameter of the middle point of the actual working face of the thread of the embedded sleeve D1. Therefore, the designed thread has ideal thread pitch and thread form so as to ensure that the large diameter and the small diameter of the actual thread of the pre-embedded sleeve D1 do not interfere with each other during detection, and the actual working condition of the thread is met. 一种预埋套管D1内螺纹检测止规，包括分别设置在两端处的手柄和螺纹体，其中螺纹体远离手柄的一端处设有外螺纹，且外螺纹上用于检测预埋套管D1内螺纹工作面并与内螺纹接触处的半径R按照预埋套管D1实际螺纹工作面中间点直径来设计，使得据以设计的螺纹具有理想的螺距及牙型，以保证检测时与预埋套管D1实际螺纹大径、小径均不发生干涉，符合其螺纹工作实际情况