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。
It is the root circle of the external spline or the inside circle (tooth tip circle) of the internal spline.
它是外花键的齿根圆，和内花键的内圆(齿顶圆)。
It is the root circle of the external spline or the inside circle (tooth tip circle) of the internal spline.
它是外花键的齿根圆，和内花键的内圆(齿顶圆)。
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