Freeform Thread \\ Fillet / Chamfer Tab (Tab 2):

Set the radius or chamfer size on corners of the thread profile.

Fillet/Chamfer : Value here is the calculated radius/chamfer for the thread defined in Tab 1.

Chamfer Angle : Angle of chamfer. Click the radio button to switch to chamfer. The value in the Fillet/Chamfer input box will then be used as the size of the chamfer.