Bolt Circle Layout

by Daris A. Nevil

It is often necessary to layout a pattern of bolt holes on a circle, such on cylinder heads. You can use this spreadsheet to compute the distance between bolts on any size circle, and with 3 or more bolt holes.

• Bolt Distance On Circle Calculator

References

• "Regular Polygon Calculator"
• "How to Calculate the Diameter of a Circular Bolt Pattern"
• "How do you Evenly Divid a Circle into Odd Parts
• "Measuring and Layout"