Form Clearance (cF) is the radial depth of involute profile beyond the depth of engagement with the mating part.
齿形裕度：齿形裕度(cF)是相互配合的内、外花键的渐开线齿廓超过结合部分的径向距离。
To make the part interchangeable, each individual part must be made to a size that will fit the mating part in the correct way.
为了使零件能够互换，每个零件作出的大小必须能准确地适用于与其匹配的零件。
To make the part interchangeable, each individual part must be made to a size that will fit the mating part in the correct way.
为了使零件能够互换，每个零件作出的大小必须能准确地适用于与其匹配的零件。
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