該量規(guī)用于管件、管用零部件、液體器械的鏈接，且不需要密封性的以機(jī)械的結(jié)合為主要目的螺紋檢查。這種量規(guī)被檢查的螺紋等級(jí)有相應(yīng)的A級(jí)和B級(jí)兩個(gè)等級(jí)，通規(guī)的A級(jí)B級(jí)的尺寸是共通的，止規(guī)分為檢查用和加工用。 The ISO standard has no specification for this item.Parallel thread (PF) are used mainly for plumbing connections,this is,equipment involving fluids. There are two classes,A and B. There are also two types of gauges.One is for inspection and the other is for metal working.The GO gauge (both plug and ring) are commonly used for both A and B classes | 
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