Generate X/Y coordinates for equally spaced holes on a bolt circle. Useful for CNC milling, drilling layouts, manual layout checks, and bolt pattern programming.
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Request a Proposal →Set your datum and start angle before programming. Verify whether the drawing uses diameter, radius, or existing hole coordinates.
A bolt circle is a circular pattern of equally spaced holes around a center point, usually defined by diameter and hole count.
Each hole is placed at a fixed angle increment. The X and Y values come from cosine and sine of each angle.
Yes, if your work offset, units, start angle, and center point match the setup. Always verify the first part.
Use this calculator to generate equally spaced hole coordinates around a center point for CNC drilling or milling.
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Use the calculator freely. If the result points to a tooling or process problem, we can source the exact carbide tooling you need from vetted factories in China. Compare factory-direct pricing.