page_title: List of gear nomenclature
section_title: Pitch surfaces
hierarchical_section_title: List of gear nomenclature / Pitch surfaces
caption_attribution_description: An illustration of a pitch cylinder
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: Pitch surfaces are the imaginary planes, cylinders, or cones that roll together without slipping.  For a constant velocity ratio, the pitch cylinders and pitch cones are circular.
caption: Pitch surfaces
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