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Bolt Circle Calculator

Construction
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Calculates the coordinates of holes on a bolt circle, given the circle's diameter, the number of holes, and the angular position of the first hole.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Bolt Circle Diameter, Number of Holes, and Angle of First Hole in the units shown.

Step 2

Read Y Coordinate of Hole 1, X Coordinate of Hole 1, Angle of Each Hole (degrees), Y Coordinate of Hole 5, X Coordinate of Hole 5, Y Coordinate of Hole 4, X Coordinate of Hole 4, Y Coordinate of Hole 3, X Coordinate of Hole 3, Y Coordinate of Hole 2, and X Coordinate of Hole 2 in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

4 Holes, 10" Bolt Circle, 0° Start

Bolt Circle Diameter: 10 inches; Number of Holes: 4; Angle of First Hole: 0 degrees

Y Coordinate of Hole 1: 0 inches; X Coordinate of Hole 1: 5 inches; Angle of Each Hole (degrees): 90; Y Coordinate of Hole 5: 0 inches; X Coordinate of Hole 5: 0 inches; Y Coordinate of Hole 4: -5 inches; X Coordinate of Hole 4: -0.0000000000000009184850994 inches; Y Coordinate of Hole 3: 0.0000000000000006123233996 inches; X Coordinate of Hole 3: -5 inches; Y Coordinate of Hole 2: 5 inches; X Coordinate of Hole 2: 0.0000000000000003061616998 inches

6 Holes, 6" Bolt Circle, 30° Start

Bolt Circle Diameter: 6 inches; Number of Holes: 6; Angle of First Hole: 30 degrees

Y Coordinate of Hole 1: 1.5 inches; X Coordinate of Hole 1: 2.598076211 inches; Angle of Each Hole (degrees): 60; Y Coordinate of Hole 5: -3 inches; X Coordinate of Hole 5: -0.0000000000000005510910596 inches; Y Coordinate of Hole 4: -1.5 inches; X Coordinate of Hole 4: -2.598076211 inches; Y Coordinate of Hole 3: 1.5 inches; X Coordinate of Hole 3: -2.598076211 inches; Y Coordinate of Hole 2: 3 inches; X Coordinate of Hole 2: 0.0000000000000001836970199 inches

3 Holes, 8" Bolt Circle, 0° Start

Bolt Circle Diameter: 8 inches; Number of Holes: 3; Angle of First Hole: 0 degrees

Y Coordinate of Hole 1: 0 inches; X Coordinate of Hole 1: 4 inches; Angle of Each Hole (degrees): 120; Y Coordinate of Hole 5: 0 inches; X Coordinate of Hole 5: 0 inches; Y Coordinate of Hole 4: 0 inches; X Coordinate of Hole 4: 0 inches; Y Coordinate of Hole 3: -3.464101615 inches; X Coordinate of Hole 3: -2 inches; Y Coordinate of Hole 2: 3.464101615 inches; X Coordinate of Hole 2: -2 inches

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