ANSIEIA310D

ANSI/EIA-310-D, written as ANSI/EIA-310-D and often referred to by the shorthand ANSIEIA310D, is a U.S. standard that specifies the mechanical dimensions and mounting interface for 19-inch equipment racks and enclosures. It is published by ANSI in collaboration with the Electronic Industries Alliance and aims to ensure interoperability and consistent fit between rack-mount equipment from different manufacturers.

The standard covers the fundamental physical characteristics of the 19-inch rack system. Primary references include the nominal rack width of 19 inches (482.6 mm) and unit heights defined in the U-space system, where 1U equals 1.75 inches (44.45 mm). It also addresses front rail mounting provisions, enclosure depth considerations, and overall tolerances necessary for reliable engagement between equipment and rack rails. The scope encompasses a wide range of equipment types, including servers, telecommunications gear, patch panels, power distribution units, and related accessories designed for 19-inch mounting.

Mounting interface and hardware: ANSI/EIA-310-D defines standardized front rail patterns and hole locations to support common rack screws and fasteners. While the standard itself does not mandate a single screw type, it is commonly implemented with hardware such as 10-32 UNC or M6 fasteners, with regional and product variations.

Impact and usage: The standard facilitates compatibility and interchangeability in modular IT and communications infrastructure. It supports efficient data-center design, lab environments, and industrial applications by ensuring that equipment from multiple vendors can be mounted in a common rack framework.

History and related standards: ANSIEIA310D is one revision within the broader EIA-310 family of standards. Internationally, related dimensions are addressed by IEC 60297 and its successors, which describe similar rack-mount interfaces.