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Abstract：
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The paper puts forward two BS (British system) formulas used for outer screw thread roll forming and screw billet diameter calculation, which have been proved and put into application through comparing calculation. It is proved that this can be also applicable for calculating the outer screw thread roll forming and screw billet diameter.
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AuthorIntro：
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Reference：
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[1]紫永勤·滚压螺纹滚丝坯径计算[J]·紧固件技术·1995,(3):
[2]陈家芳,车工实用计算手册[M]·上海:科学技术出版社,1992·
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