They are a bit on the short side so I might put some felt on both sides to make them closer to the 1.75 inches. I now keep a pair of these wooden spacers in my kit for when I need to shuffle gear around in a rack. If you make the 2″x4″ scraps long enough and have them stick out a bit, you can use them as a lever to adjust the height of the device you’re mounting. What this means is that (2) 2″x4″ scraps make great 1RU spacers to support gear while you install the screws. What might make a good spacer that is inexpensive, readily available and easy to manange? A modern wooden 2″x4″ is roughly 1 & 1/2″ x 3 & 3/8″. Most of the racks I’ve measured are 19 1/16″ or 19 1/8″ wide. In this case the gear I own wouldn’t line up with the rack holes. I’ve had racks that were almost 19.25 inches. Rack manufacturers also build a bit larger than 19″ wide. So manufacturers undersize their gear just a bit to make sure it fits. Obviously if a RU is 1.75 inches the gear itself cannot also be 1.75″ or the tolerances for both the rack and the gear would need to be absolutely perfect. So 1RU = 1.75″ (inches) tall and 19″ +/- wideįor reference, this is one of my Glyph hard drives measured with a digital caliper. I’ve also used audio gear as a spacer before which works if you have a spare 1RU, 2RU, 3RU audio device handy but you run the risk of trapping the device in the rack.įor those of you who may not know what a “rack unit” is, here is a wiki article that explains it. I’ve been known to use my teeth, knees, toe, etc… Sometimes supporting the device while you install the rack screws can be a great challenge. Sometimes you will need to leave a 1RU space in between devices for thermal reasons. Many times in life you will need to mount a device in a rack without the assistance of a friend.
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