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.

Collet Set, R8 Metric, Set of 10

Set of ten R8 round collets in metric sizes
Hardened and ground to close tolerance
Made of high grade tool steel
7/16" -20 drawbar thread
0.0007" (0.018 mm) maximum runout

$66.95

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Dial Indicator, Test Indicator, Magnetic Base & Point Set

0-1" dial indicator with 0.001" resolution
0-15-0 dial test indicator with 0.0005" resolution
Magnetic base indicator holder with fine adjustment
22 piece indicator point set
All in a plastic case

$59.95

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Bell Punch Center Finder

A handy tool if with you require precise drilling on round stock.
Works on stock up to 35mm (1 3/8")
Made of hardened steel - 48-52 HRC
Overall length 80 mm (3-9/64")
Shank length and diameter 9.5mm (3/8")

$19.95

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