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The minimum width of the opening between the vertical rails is 17.72 inches (450 mm) .
When searching for the "eia 310 d standard pdf," you might notice newer versions exist. Let's clarify the differences: eia 310 d standard pdf
Before this standardization, every hardware vendor had their own idea of what a "rack" should look like. In the 1990s, this caused chaos. Dell chassis wouldn't fit into IBM cabinets. HP rails were too short for Compaq racks. EIA 310-D solved this by defining the "19-inch rack" standard that we use globally today. The minimum width of the opening between the
The standard defines the vertical distance between holes. eia 310 d standard pdf