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简单介绍了ＡＰＩ圆螺纹套管及接箍螺纹紧密距检验时所使用的螺纹量规的结构特点，着重阐述了套管及接箍螺纹控制和检验紧密距参数时， 易被忽视和误解的有关长圆螺纹的凸出量、紧密距Ｐ 和Ｐ１ 的正负、手紧紧密距牙数Ａ及短圆螺纹套管紧密距的修正等几个问题。并给出圆螺纹套管及接箍螺纹正确的检验程序， 以避免检验紧密距时产生误判。
This paper briefly introduces the structural features of the thread gauges used in testing the tightness of the API threaded bushing and the tight coupling between the threaded bushing and the coupling. The protruding amount of thread, the close distance between positive and negative of P and P1, the close and tight close tooth number A, and the correction of the close distance of short round bushing. And gives the round thread casing and coupling thread the correct test procedures to avoid misjudgment when testing close distance.