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.

Boring Head Set, R8, Indexable with 4 Boring Bars

Includes boring head, R8 shank, and 4-piece indexable boring bar set
The boring head offsets up to 5/8", dial is graduated in 0.001"
Minimum bore diameter is 7/16"; Maximum boring diameter is 5.906"
Maximum boring depth is 2.5"
The included indexable boring bars come with TCMT 21.5 C6 carbide inserts for steel and alloy

$219.95

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Way Oil, Mobil Vactra Oil No. 2, Pint

ISO viscosity 68
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Rust Protection, ASTM D 665B Pass

$10.95

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Bench Grinder, 8" Low Speed

Powerful 1 HP motor
No load speed 1750 RPM
Adjustable tool rests
Adjustable safety eye shield and spark resistors

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