19 inch Rack Dimensions

3D Cases Basic 19" Rack Styles

EIA (Electronic Industries Association) Dimensions

Interestingly, nothing on a 19" rack case or enclosure actually measures 19 inches. The 19 inch dimension comes from the front panel width of the equipment that you are installing in to the 19" rack case.

The original 19" standard came about some 50 years ago as an EIA (Electronic Industries Association) standard, and then on through various standards managed by ECA, ECIA and DIN. Today DIN 41494 and IEC 60297-3-100 specify the basic dimensions of front panels, sub-racks, chassis, racks and cabinets for the 482,6 mm (19") standard, the later of which can be downloaded at a small cost from the IHS Store.

A brief description of the specifications would be as follows. The EIA standard server rack is a 19 inch wide rack enclosure with rack mount rails which are 17 3/47" (450.85 mm) apart and whose height is measured in 1.75" (44.45 mm) unit increments.

ETSI 23" (584.2mm) Standard Rack

In addition to the 19" system 3D Flight Cases also offer the less popular ETSI (European Telecoms Standards Institute) or Western Electric 23 inch standard, with holes on 1” (25.4 mm) centre, which prevails in telecommunications (Telco) industry. Clients such as BT Telecom purchase our shock mounted racks to this standard, please contact us for further details.

19" Rack Mounting Rails

As standard we use a 'double' leg rack mounting rails in our flight case racks which allows for optional support rails to be fitted front to rear. Unless requested otherwise, this will have square hole fixings which accept 6mm caged nuts.

3D Flight Cases - Double Leg Rack Mounting Rail
Double Leg Rack Mounting Rail

Double Leg Rack Mounting Rails With Front To Rear Supports
Double Leg Rack Mounting Rails With Front To Rear Supports

Other options include single leg rack mounting rails with square holes, again accepting standard 6mm caged nuts or tapped holes with M5, M6 or 10/32 UNF thread options. Please see the follow two images.

Single Leg Rack Mounting Rail With Square Holes
Single Leg Rack Mounting Rail With Square Holes

Single Leg Rack Mounting Rail With Tapped Holes
Single Leg Rack Mounting Rail With Tapped Holes

19" Rack Unit Standard Dimensions

The standard rack system allows multiple height items to be bolted into a rack enclosure, or in our case, a 19" Rack Flight Case. The height of this 19" equipment must be in multiples of Rack Units, each of which is 44.45mm (1.75 inches) in height, for instance 2 Unit = 88.90mm (3.5"), 4U would = 177.80mm (7.00"). Rack Units are also referred to a U, RU, RMU and also HE. A table showing rack units to millimetres / inches can be found here: Rack Unit Sizes.

The following details are the basic dimensions from the IEC 60297-3-100 standards which our flight case racks adhere to.

  • Rack opening width: 450.85mm
  • Between fixing centre: 465mm
  • Between rack outer edge faces: 486mm
  • Recommended equipment front panel width: 483mm (19 inches)
  • Recommended equipment body width: 449mm (maximum)
  • 1U incremental height: 44.45mm (1.75 inches)

Whilst we generally use the square hole design which accepts a 6mm caged nut, also shown below is the threaded fixing hole style of design.

19" Vertical Hole Spacing

The specification for the vertical hole spacing is defined as a repeating pattern of holes within one Rack Unit of 44.45mm (1.7"). See the diagram below.

19" Rack Vertical Hole Spacing
19" Vertical Hole Rack Spacing

19" Horizontal Hole Spacing

The horizontal spacing of the vertical rows of holes centre to centre is accepted at 465mm (18.312").

19" Horizontal Hole Spacing
19" Horizontal Hole Spacing

19" Rack Opening

The opening between the rack mounting rails should be a minimum of 450mm (17.72"). If this distance is reduced it maybe that the equipment you are trying to mount will not fit, as the standards for the equipment width is only a millimetre smaller than this. The outside dimension is not specified in the IEC standards and is not critical as it will not effect the successful mounting of your 19" equipment.

19" Rack Opening
19" Rack Opening Size Between Rack Mounting Rails

19" Rack Panel

And finally the 19" Panel it's self. Not part of the rack case system but the dimension of the products you will be trying to fit. This shows the dimensions of the front panels of your equipment, blanking panels or connector panels etc. Normally supplied with oval holes for fitting although sometimes supplied with slotted or just round holes as shown in the diagram. All panels are 482mm (19 inches) wide by 'X' number of Rack Units high. Further details of rack unit sizes can be found on our 19 Inch Rack Unit page

19" 1 Unit & 2 Unit Rack Panel Dimensions
19" 1 Unit & 2 Unit Rack Panel Dimensions

19" Rack Accessories

To view many of our 19" rack accessories please see our rack accessories gallery which offers an insight into these products. If you cannot find what you are looking for please contact us as many more are available. We are also able to produce bespoke laser cut and etched panels to order with a fast turn-around.

Need further information? Our team are always on hand to answer any questions about our various series of 19"rack cases and shock mounted portable server racks along with our ancillary 19" products. Please call 01733 269026 or drop us an email to our Email - Mouse Over To Reveal.

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