TOOLS / LAYOUT

Bolt circle and PCD calculator

Calculate equally spaced hole positions, chord spacing and centre coordinates around a pitch circle.

Lay out equally spaced holes around a pitch circle.

Hole layout70.71 mm chord spacing

Coordinates from centre: 50.00, 0.00 · 0.00, 50.00 · -50.00, 0.00 · -0.00, -50.00

Coordinates are a layout aid. Confirm datum, drill tolerance, edge distance and drawing requirements.

Built for practical decisions

Use the coordinates as a layout aid for flanges, discs, machine plates and drilling templates. Always verify the datum, hole tolerance and edge distance on the drawing.

Important assumptions

Use the result as a planning estimate. Confirm material data, machine settings, drawing tolerances and applicable standards before production or structural work.

Quick answers about this bolt circle and pcd calculator

What does the bolt circle and pcd calculator help me decide?

Calculate equally spaced hole positions, chord spacing and centre coordinates around a pitch circle.

Can I use the result directly for production?

Use it as a starting estimate. Verify the drawing, material grade, machine capability, tooling data and applicable standard before cutting, forming, welding or ordering material.