LittleMachineShop.com is the premier source of tooling, 
parts, and accessories for bench top machinists.
The premier source of tooling, parts, and accessories for bench top machinists.
 
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PORTaMIST Spray Mist Unit 18"
 
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Drawbar, 2MT x 3/8"-16, Micro Mill
Drawbar, 2MT x 3/8"-16, Micro Mill
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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  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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