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The general taps are right-hand thread. Please specify if some left-hand thread taps are needed.
丝锥通常生产右扣螺纹， 如需左扣螺纹应在订货时说明。
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Regard these two bores as the basis finally, process the right-hand slot respectively with the thread bottom bore of the a.
最后以这两个孔为基准，分别加工右侧的槽和顶面的螺纹底孔。
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