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測范社螺紋規螺紋塞規、螺紋環規、螺紋量規、SHS&JPG
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 極限螺紋量規ISO方式 Limit thread gauge of gauging system for ISO class 平行螺紋量規一般的方式是極限式。利用量規的通、止規管理產品螺紋的極限，保證精確度。極限式量規大致可以分為ISO等級測量方式和以前的JIS等級測量方式。以前的JIS測量方式在量規的止端有檢查用和加工用的區別。ISO測量方 式則沒有這樣的區別，他完 全被簡單化了。測量外徑用的卡規也是一樣的。具體使用方法為界限螺紋量規的通規可以輕松穿過，止規的螺紋擰進不到2圈的話，這樣測量等級則是合格的。    In the thread gauges system,the limit type is most common.Thread of workpiece is ensured by controlling the GO and NOT GO limit.The types of limit thread gauges systems are broadly divided into ISO class and conventional JIS class.There were two different types of conventional JIS gauges,one for inspection and one for production use.    The ISO system is simpler and does not have two types 表示方法  Example 螺紋用的主要界限量規之使用方法 Major gauges for threads of workpiece • ISO等級的美標螺紋，管用平行螺紋用的量規都適用。  Gauging system for ISO class Metric,Parallel pipe (G)• GP,GR等用手擰進螺紋，并輕松的穿過。Screw this gauge in a worked thread by hand smoothly.GP,GR must go through over the whole length of thread.• NP,NR等用手擰進螺紋，螺紋擰進多不超過2圈。 Screw this gauge in a worked thread by hand smoothly by hand NP,NR shall not be screwed in it more than two revolutions from either sides.• GW,NW等用手擰進的同時，螺紋擰進多不超過一圈。GR,NR shall not be screwed in more than one revolution from either sides when screwing this check plug smoothly.

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