noun, Machinery.
See under .
(in a gear or rack) an imaginary surface forming a plane (pitch plane) a cylinder (pitch cylinder) or a cone or frustrum (pitch cone) that moves tangentially to a similar surface in a meshing gear so that both surfaces travel at the same speed.
an imaginary cylinder passing through, and coaxial with, the threads of a screw so that its intersection with opposite flanks of any groove is equal to half the thread pitch


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