page_title: List of gear nomenclature
section_title: Addendum circle
hierarchical_section_title: List of gear nomenclature / Addendum circle
caption_attribution_description: English: Internal diameters
context_page_description: This page lists the standard US nomenclature used in the description of mechanical gear construction and function, together with definitions of the terms. The terminology was established by the American Gear Manufacturers Association, under accreditation from the American National Standards Institute.
context_section_description: The addendum circle coincides with the tops of the teeth of a gear and is concentric with the standard (reference) pitch circle and radially distant from it by the amount of the addendum.  For external gears, the addendum circle lies on the outside cylinder while on internal gears the addendum circle lies on the internal cylinder.
caption: Internal gear diameters
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