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SIEG C3 7x14 Mini Lathe
SIEG C3 7x14 Mini Lathe
 
 
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Model Steam Launch Engine Material Kit
Model Steam Launch Engine Material Kit
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Machinist's Calculator

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Bolt Circle Diameter Calculator

 Calculator Menu

Enter values below to calculate the diameter of a bolt circle.

Number of Holes N
Center Distance Between Adjacent Holes C   in  mm
 

Tip:

To measure the center distance between two holes of equal diameter with an electronic caliper.

1. Use the inside jaws to measure the diameter of one of the holes. Before you remove the caliper from the hole, press the button to zero the caliper while it is set to the diameter of the hole.

2. Still using the inside jaws, measure the distance between the far surfaces of the two holes. The caliper reading is the distance between centers of the two holes.
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