page_title: List of gear nomenclature
section_title: Addendum
hierarchical_section_title: List of gear nomenclature / Addendum
caption_attribution_description: English: Principal dimensions
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 is the height by which a tooth of a gear projects beyond (outside for external, or inside for internal) the standard pitch circle or pitch line; also, the radial distance between the pitch diameter and the outside diameter.
caption: Principal dimensions
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