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对于丝杠来说，节距与导程有什么区别？

节距是丝杠沟槽间的距离，通常用于英制产品，单位为每英寸螺纹数。导程是丝杠每旋转一周螺母直线运动的距离，通常是滚珠丝杠的指定方式。对于单头丝杠，节距与导程相等。对于多头丝杠，导程等于节距乘以头数。

http://www.thomsonlinear.com/website/com/eng/training/difference_between_screw_pitch_and_lead.php

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