U Conversion Chart
What is a “U” or “Rack Unit”?
The “U”, “RU” or “Rack Unit”, was created by the Electronic Industries Association (EIA). The EIA standard was created for cabinets, racks and panels, as well as other associated equipment.
It sets a standard for system spacing, mounting, bezel clearance, as well as placement of the mounting holes in the mounting flange. One rack unit is 1.75 inches. To quickly convert rack units into inches use our rack unit conversion calculator or click Here for a PDF U Conversion Chart.