ICs21.040.30J04GB中华人民共和国国家标准GB/T12716-200260密封管螺纹Pipe threads with the thread angle of 60 degrees wherepressure-tight joints are made on the threads2002-03-10发布2002-08-01实施中华人民共和国发布国家质量监督检验检疫总局
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