While a rack unit is defined as 1 + 3⁄ 4 inches (44.45 mm), a front panel or filler panel in a rack is not an exact multiple of this height. The standard was adopted worldwide as IEC 60297 Mechanical structures for electronic equipment – Dimensions of mechanical structures of the 482.6 mm (19 in) series, and defines the sizes for rack, subrack (a shelf-like chassis in which cards can be inserted), and the pitch of printed circuit boards/cards providing physical compatibility of technological equipment, typically in telecommunications. The Eurocard specifies a standard rack unit as the unit of height it also defines a similar unit, horizontal pitch (HP), used to measure the width of rack-mounted equipment. The rack unit size is based on a standard rack specification as defined in EIA-310.
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