A bolt circle (or bolt circle diameter, BCD) is a term used in engineering and manufacturing to describe the diameter of an imaginary circle that passes through the centers of a set of evenly spaced bolt holes. It's commonly used in the context of wheels, flanges, and other components where bolts are used to attach parts together. The bolt circle measurement is important for ensuring that parts fit together properly and that the forces are distributed evenly across the connected components.
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