Define: 19″ Rack

Description:

The funny thing is . . . Nothing on a 19″ Rack measures 19 inches. The term 19 inch comes from the width of the front panel of the boxes that are installed in the rack (see the image below). To determine if your rack is a 19″ rack, measure the hole to hole spacing.

Rack hole-to-hole spacing:

19″ Rack = 18-5/16″ (18.312″) (465.1 mm)
23″ Rack = 22-5/16″ (22.312″) (566.7 mm)
24″ Rack = 23-5/16″ (23.312″) (592.1 mm)

More Information

• What is a Rack Unit (”U” or “RU”)
• What is EIA-310
• Wikipedia has an in-depth overview of 19″ racks.
• Why all racks are not created equal

This entry was posted on Wednesday, October 10th, 2007 at 3:39 pm and is filed under Popular, Terminology. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.