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

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

 Variables Distance over alternate pins (y) = Diameter of holes (d) = Angle between adjacent holes (Theta) = Results Distance over opposite pins (x) =

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