Bolt Circle Diameter Calculator

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

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.

HiTorque 7500 Bench Lathe - 8.5x20

Inch dials, inch and metric threading
1000 Watt (1.34 HP) brushless DC drive with spindle speed readout
Power longitudinal feed and power cross feed
Reversible lead screw for right and left hand threads
4" (100 mm) 3-jaw self centering lathe chuck

$2,699.00

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Machine screw and fractional sizes of plug style taps plus 1" solid round dies
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18-leaf standard thread pitch gauge and screwdriver
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HiTorque 7550 Deluxe Bench Lathe - 8.5x20

DRO and digital dials, inch and metric threading
1000 Watt (1.34 HP) brushless DC drive
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