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.

Quick Change Tool Post Set, 0XA, Mini Lathe, 4-Degree Cut-Off

Quick change tool post set for lathes with up to 9" swing
60% of AXA, or series 100 size wedge type QCTP
This lathe quick change pool post set includes a 4-Degree Cut-off tool holder
Includes five tool holders
All steel construction

$139.95

Regularly $154.95

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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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60 Piece #1-60 Transfer Punch Set
Range is #1 to #60
Heat treated and tempered tool steel for long life
Transfer punches are 0.0025" undersize for precise fit

$28.95

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