Pitch Diameter, thread groove diameter

Pitch Diameter, thread groove diameter Per ASME B1.7-2006 Definitions [ back to main page ]

Pitch Diameter, thread groove diameter: the diameter of an imaginary cylinder or cone, the surface of which would pass through the thread profiles at such points as to make the width of the thread groove or thread vee (measured parallel to the axis) equal to half of the pitch.  It is the diameter yielded by measuring over or under cylinders (wires) or spheres (balls) inserted in the thread groove on opposite sides of the axis to compute the thread groove diameter.  Simple effective diameter and simple pitch diameter are defined the same as the preferred term thread groove diameter.  It is also commonly referred to as groove diameter.

Original Posting: 3/20/2012
Last Revision:9/8/2017
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