Horizontal pitch (HP) is a unit of length defined by the
Eurocard printed circuit board
A printed circuit board (PCB; also printed wiring board or PWB) is a medium used in Electrical engineering, electrical and electronic engineering to connect electronic components to one another in a controlled manner. It takes the form of a L ...
standard used to measure the horizontal width of rack mounted electronic equipment, similar to the
rack unit
A rack unit (abbreviated U or RU) is a unit of measure defined as . It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, as well as the height of equipment that mounts in these frames, whereby th ...
(U) used to measure vertical heights of rack mounted equipment. One HP is wide.
VME Dimensions; Eurocard subracks; VME.com
/ref> A standard 19-inch rack
A 19-inch rack is a standardized frame or enclosure for mounting multiple electronic equipment modules. Each module has a front panel that is wide. The 19 inch dimension includes the edges or "ears" that protrude from each side of the equ ...
is 95 HP wide of which 84 HP is typically usable. A standard 23-inch rack is 115 HP wide of which 104HP is typically usable.
References
Units of length
Mechanical standards
Computer enclosure
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