在计算梯形牙深度里 “牙顶间隙 在螺距6-12时为0.5”其中 6-12时为0.5是什么意思，怎么得来的
推荐回答（2个）
是说在螺距6-12毫米 时，内外螺纹的间隙是0.5毫米 ，直径上相差1毫米
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