bolt circle diameter

The bolt circle diameter (BCD) is a critical measurement used to specify the diameter of an imaginary circle that passes through the center of all bolt holes on a component, such as a wheel or flange. This dimension is essential for ensuring proper fitment and alignment when attaching parts, as it determines the spacing and positioning of the bolts. Understanding BCD is important in various applications including automotive wheels, machinery, and structural assemblies, where precision and compatibility are key to safety and performance.