July 2021 Tip: Coordinate Constants from Center

Coordinate Constants from Center:

These are used for establishing coordinate hole locations from the center location of a bolt circle with equally spaced holes. The holes can be aligned to a reference point on a center-line or equally spaced on both sides of the centerline.

To use these values, first, select the required number of holes for the bolt circle and choose the appropriate type of coordinate reference location (either on the centerline or between the holes).

Then, multiply the diameter of the bolt circle by the constant values shown in the chart. (Be careful to notice the plus (+) and minus (-) value for each constant). The resulting answers represent the coordinate locations and directions of the holes from the "X" and "Y" center reference points for the specified diameter of the bolt circle.

Download the full PDF, which includes coordinate constants from center for 3 to 12 holes. Contact me if you would like for me to email the full PDF to you instead.

Sample: Coordinate constants for center for 4 holes

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