18.312 inches (465.1 mm)
from the first hole to the second hole.
Commonly found in traditional telecom environments, these rails feature pre-tapped holes. Equipment is screwed directly into the rail. eia310d standard pdf
These risks include:
From the top of a 1U boundary down to the bottom, the spacing between the centers of the holes measures: These risks include: From the top of a
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Commonly used in telecommunications, two-post relay racks, and AV environments. The holes are pre-threaded, usually for 10-32 or 12-24 screws. Can’t copy the link right now
While the organization has dissolved, archived documents may exist.
A common challenge for professionals is locating a PDF of the EIA-310D standard.
The standard allows round unthreaded, 10-32 threaded, and 12-24 threaded holes. It does not specify the modern "square hole" cage nut pattern. Square holes became popular through de facto industry adoption because they accept both metric (M6) and imperial (10-32) cage nuts. However, square holes are technically a later evolution (often referenced in EIA-310-E).