Light Pole Base Anchor Bolt Calculator

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Bolt Circle Calculator

Knowing the pole base anchor bolt configuration is important when it comes to determining the bolt circle calculation for light poles. The majority of light poles that we see are square with anchor bolts in the corners. At times, there is an existing pole in place which makes it difficult to measure the corner to corner diagonal. Our calculator will help calculate the bolt circle for square 4-bolt patterns where the only measurement needed is the space between bolts.

Enter the information below to estimate your bolt circle calculation.

Light pole bolt circle calculator image on Bay Lighting's Maryland commercial lighting website
Bolt drawing on Bay Lighting's Maryland commercial lighting website

Bolt Circle Calculator

This calculator is for use with square 4-bolt patterns.
Measure center of one bolt to the center of an adjacent bolt and enter your value.
Distance Between Bolts (inches)
Your results…
Bolt Circle Diameter (inches)
* This calculator is for estimating only. Bay Lighting is not responsible for errors.
Bolt drawing on Bay Lighting's Maryland commercial lighting website


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