It is the outside circle (tooth tip circle) of the external spline or the root circle of the internal spline.

它是外花键的外圆(齿顶圆)，和内花键的齿根圆。

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It is the outside circle (tooth tip circle) of the external spline or the root circle of the internal spline.

它是外花键的外圆(齿顶圆)，和内花键的齿根圆。

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