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根据部(73)三科1148号文的要求,由红旗机械厂、红安公司和庆安公司组成了部标准《螺纹收尾》修订组,于一九七四年二月开始工作。修订组经过五个多月的工作,于同年八月完成了报审稿。一九七五年五月二十五日召开的部标准审定会上审查通过了该项标准,现已经部批准正式颁发,标准编号为HB 246-75现将本标准在修订中的有关问题说明如下:一、增加了六个螺距规格根据当前生产和使用情况,增加了“t=2.5、3.5、4.5、5.5．5.6”等六个螺距规格。二、标准的引言
Pursuant to the requirements of Section (73) III Section 1148, Hongqi Machinery Factory, Hongan Company and Qing An Company formed the standard standard “End of Thread” Amendment Section and started work in February 1974. After more than five months of work, the revised team completed the review of the manuscript in August of the same year. This standard was examined and approved at the ministerial standard validation meeting held on May 25, 1975 and has now been formally approved by Ministry of Industry and issued with the standard number of HB 246-75. As follows: First, an increase of six pitch specifications According to the current production and use of conditions, an increase of “t = 2.5,3.5,4.5,5.5.5.6” six pitch specifications. Second, the standard introduction