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 7550 Deluxe Bench Lathe - 8.5x20

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

$3,699.00

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Quick Change Tool Post Set, 0XA, Mini Lathe, Horizontal Cut-Off

Quick change tool post set for lathes with up to 8" swing
0XA, or series 000 size (60% of AXA size)
Includes five steel tool holders
Horizontal Cut-off tool holder
Fits all 7x10 to 7x16 mini lathes

$139.95

Regularly $154.95

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Angle Plates, Set of Two

Accuracy: ± 20 seconds
Thickness: 1/4"
1 pc: 4" x 3 12/32" x 2" with 30°, 60° & 90° angles
1 pc: 3" x 3" x 4 3/8" with 45°, 45° & 90° angles
Four 11/32" holes for easy mounting

$21.95

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