螺纹的参数较多,主要有五个,即中径、大径、小径、螺距和牙形角(详见第四十八讲)。其中的大径和小径是结构参数,要求不高,公差较大。影响螺纹准确度和工作质量的主要参数是中径、螺距和牙形半角。除了精密螺纹是对此三项参数分别检测外,对于极大多数紧固连接用的普通螺纹和部分工作螺纹量规都可用螺纹量规来综合检验。一般的极限量规都有通端量规和止端量规,螺纹量规也一样。通端螺纹塞规在检验内螺纹时,作 Threaded parameters are more, there are five main, namely, diameter, diameter, diameter, pitch and tooth angle (see the forty-eighth talk). One of the large diameter and small diameter structure parameters, less demanding, larger tolerances. The main parameters that affect the thread accuracy and quality of work are the diameter, pitch and tooth half angle. Except for precision threads, which are tested separately for these three parameters, normal thread and some working thread gauges for the vast majority of fastening connections can be collectively checked with a thread gauge. The general limit gauges have end gauge and end gauge, the same thread gauge. Through-end thread plug gauge in the inspection of internal thread, for