Rack rail

Not to be confused with Rack railway.

A rack rail, or rack strip, is used to mount rack-mountable equipment and 19-inch rack mount accessories within a 19-inch rack. A minimum of two rack rails are required to mount equipment within a rack. The height of a rack rail is determined by the number of rack units required for mounting its equipment.

The design of racks and rack rails is specified in ECIA - EIA/ECA-310.

Each rack unit (U) is equivalent to 1+3⁄4 in (44 mm). Most rack rails are in sizes from 2 units high (3+1⁄2 in or 89 mm) to 54 units high (78+3⁄4 in or 2,000 mm).

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