貨號產(chǎn)品型號規(guī)格用途NR.TypeSpecificationUsage642-021ZJY20-W23/8~20in 用于外螺紋中徑的測量 Measurethemiddlediameterofouterscrew.642-022ZJY20-N23/8~20in 用于內(nèi)螺紋中徑的測量 Measurethemiddlediameterofinnerscrew.642-023BZG-W23/8~20in 用于外螺紋中徑測量前的校準?! ectifyouterscrewmiddlediametermeasuringinstrument642-024BZG-N23/8~20in 用于內(nèi)螺紋中徑測量前的校準?! ectifyinnerscrewmiddlediametermeasuringinstrument