用于API螺纹螺距的测量,使用螺距标准块进行调零； FYWM系列 API螺纹螺距测量仪 FYWM Series API Thread Pitch Gages 用于API螺纹螺距的测量,使用螺距标准块进行调零； Measure the API thread pitch，need be preset with the Lead stardards. http://www.szfyou.cn FYWM系列 API螺纹螺距测量仪标准块 FYWM Series API Thread Pitch Setting Stardards 用于内、外螺距测量仪使用前标准值的校对,需要单独购买。 Pitch setting stardards are used to preset the thread pitch gages contact points location porior to the inspection of the threaded connector。Sold separately from the gages.