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Rack Specifications

DLI products are designed to RETMA EIA rack specifications.  Mounting holes are slotted so racks that aren't perfectly assembled will still work.

Most mounting brackets can be reversed (mounted on the back of the product, or rotated 90 degrees for wall mounting.

When attaching rack-mount ears, be sure not to use screws that penetrate more than 1/8" into the device.  Standard rack specifications follow:


EIA-310 is a specification for what is often called the “standard rack”. This specification standardizes several important features of 19″ racks, such as the Rack Unit (RU or U), vertical hole spacing, horizontal hole spacing, rack opening and front panel width. The specification also sets tolerances on each of these dimensions.

The EIA-310 specification has been the 19″ racks standard for equipment for 50 years. Despite this, RackSolutions believes that the items that the specification does not cover is the real reason for the industry wide incompatibility we now face. Rack features such as hole type, rack mounting depth, front and rear space, and obstructions between front and rear rails are the cause of real rack headaches.

Vertical Hole Spacing

Vertical hole spacing is defined as a repeating pattern of holes within one Rack Unit of 1.75″. The hole spacing alternated at: 1/2″ – 5/8″ – 5/8″ and repeats. The start and stop of the “U” space is in the middle of the 1/2″ spaced holes. See the diagram below.

Vertical Hole Spacing


Horizontal Spacing

The horizontal spacing of the vertical rows of holes is specified by EIA-310 at 18 5/16″ (18.312)(465.1 mm). This dimension is not well maintained on some racks, causing problems with equipment installation. Many manufacturers use equipment mounting slots instead of holes to allow for variations in this dimension.

Horizontal Spacing

Rack Opening

The opening in the rack is specified as a minimum of 17.72″ (450mm). 2Post or relay racks tend to have a larger than normal opening, as do many other racks with threaded holes. Square hole racks tend to be very close to the minimum opening.

Rack Opening

Front Panel Width

The only dimension on a 19″ rack that actually measures 19″ is the width of the front panel of equipment.

Front Panel Width