19-inch rack: Difference between revisions
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== Dimensions == |
== Dimensions == |
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[[File:19 inch rack dimensions.svg|thumb|500px|right|19" rack dimensions]] |
[[File:19 inch rack dimensions.svg|thumb|500px|right|19" rack dimensions]] |
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[[File:Kaefigmutter martink.jpg|thumb|right|200px||Rack rail and cage nut]] |
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RU (rack unit) or U is the unit of measure used to describe the height of equipment intended for mounting in a 19-inch rack. One U is 1.75 inches (44.45 mm) high. |
RU (rack unit) or U is the unit of measure used to describe the height of equipment intended for mounting in a 19-inch rack. One U is 1.75 inches (44.45 mm) high. |
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== Fastening == |
== Fastening == |
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Tapped-hole racks are used for hardware that rarely changes, such as phone, network cabling panels, TV broadcasting facilities, studios and relay racks. Clearance-hole racks have holes large enough to permit a bolt to be freely inserted through without binding, and held in place by cage nuts, (a spring steel clip within which is a captive nut). Square-hole racks allow boltless mounting, such that the rack-mount equipment only needs to insert through and hook down into the lip of the square hole. |
Tapped-hole racks are used for hardware that rarely changes, such as phone, network cabling panels, TV broadcasting facilities, studios and relay racks. Clearance-hole racks have holes large enough to permit a bolt to be freely inserted through without binding, and held in place by cage nuts, (a spring steel clip within which is a captive nut). Square-hole racks allow boltless mounting, such that the rack-mount equipment only needs to insert through and hook down into the lip of the square hole. |
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=== Mounting screws === |
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These days square holes for cage-nuts in rack rails are more common than threaded holes. The mounting screws and cage-nuts sizes are typically: |
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* Metric M6, (thread size of 6 millimeters). These are larger and stronger than the #10-32 screws. |
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* American #10-32, (drill size 10 and 32 threads per inch), smaller than a #12-24 screw. |
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* American #12-24, (drill size 12 and 24 threads per inch), larger than a #10-32 screw, smaller than an M6 screw.<ref>[http://www.rackittechnology.com/shopping/solution.php?cID=202 Rack-mounting screws for mounting equipment, shelves, and accessories onto IT racks], Rackit Technology</ref> |
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== References == |
== References == |