### Bolt Circle With Even Number of Holes Within Circle Measurement and Conversion Calculator

**Engineering Calculators | Section Properties Menu
Engineering Metals and Materials | **

**Strength of Materials**

For More equations and illustrative graphics see:

**Measuring Large Bolt Circle Equations and Review**

**Even Number of Holes Within Circle:** To measure or determine the unknown distance x over opposite pins (largest gage pins that can fit into holes) within a bolt circle of holes (n or number of bolts holes must be even and greater than 4), as shown left in Illustration A, use the equation:

Where:

y = the distance over alternate pins

d = the diameter of the holes

θ = 360°/n or angle between adjacent holes.

All units shall be consistant and given in inches or mm. Angles (theta) are given in degrees