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Bolt Circle Calculator — Free Online Tool
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Bolt Circle Calculator

Calculate bolt hole coordinates, chord spacing, and pitch circle diameter

Formulas:
• Bolt Circle Diameter (BCD) = Diameter of the circle passing through hole centers.
• Chord Distance (C) = 2 × R × sin(π / N)
Bolt Circle Parameters

Calculation Results

⚠️ Bolt circle coordinates are calculated from the center origin (0,0). Always verify machine tool zero points and flange alignment marks prior to drilling or milling operations.

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