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center-to-center, on center

The distance between the center line of one element, member, part, or component (as a stud or joist) and the center line of the next.
References in periodicals archive ?
9172 nm) collagen fibrils, but there are no statistically significant differences in center-to-center spacing or edge-to-edge spacing for anterior versus posterior normal collagen fibrils.
Two displays will be positioned above the sidelines and will measure approximately four feet high and 180 feet long (48 pixels high, 23 mm center-to-center spacing).
These ProAd(TM) displays will use RGB LED pixels on 34mm center-to-center spacing.