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Approximately 17.75 inches (450.8 mm). This is the maximum allowable width for the actual body of the server or switch to slide between the front rack rails. Types of Mounting Holes Standardized under EIA-310-E
Over the decades, the Electronic Industries Alliance (EIA) stepped in to formalize this custom as a universal standard known as . The "E" in
The minimum opening between the left and right rack rails must be at least 17.72 inches (450 mm) to allow the equipment body to slide into the rack. Key Hardware and Mounting Types Defined Eia Eca-310-e Pdf
), measured from the outermost mounting hole of one side to the other. 2. Vertical Hole Spacing (Rack Units - U)
| Aspect | Detail | |--------|--------| | | EIA ECA-310-E: Cabinet, Racks, Panels, and Associated Equipment | | Key Purpose | Defines 19-inch rack mounting dimensions | | Critical Spec | 1U = 1.75", 18.312" hole spacing | | Current Revision | E (check ANSI/EIA for updates) | | How to Buy | ANSI, IHS Markit, Techstreet | Approximately 17
, this guide summarizes the critical specifications you need to know. Core Purpose
When buying a new server rack (e.g., from APC, Vertiv, Rittal), you need to verify that it conforms to EIA-310-E. Non-conforming racks might have slightly wider rails that prevent proper airflow or cable management. The "E" in The minimum opening between the
Equipment height is always specified in multiples of U (e.g., 1U, 2U, 4U, 42U).
This is where things get detailed. The standard defines three common hole patterns:
The only dimension that is exactly 19 inches is the width of the equipment’s front mounting flange. Comparison: EIA-310-D vs. EIA-310-E
ECIA Standard EIA-310-E, "Cabinets, Racks, Panels, and Associated Equipment," Electronic Components Industry Association, 2005 (or latest revision date).
