19-inch rack: Difference between revisions

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== Dimensions ==

[[File:19 inch rack dimensions.svg|thumb|500px|right|19" rack dimensions]]

[[File:Kaefigmutter martink.jpg|thumb|right|200px||Rack rail and cage nut]]

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 ==

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.

=== Mounting screws ===

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:

* Metric M6, (thread size of 6 millimeters). These are larger and stronger than the #10-32 screws.

* American #10-32, (drill size 10 and 32 threads per inch), smaller than a #12-24 screw.

* 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>

== References ==

@@ Line 3: / Line 3: @@
 == Dimensions ==
 [[File:19 inch rack dimensions.svg|thumb|500px|right|19" rack dimensions]]
+[[File:Kaefigmutter martink.jpg|thumb|right|200px||Rack rail and cage nut]]
 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.
@@ Line 10: / Line 11: @@
 == Fastening ==
-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.<!-- thread specs?-->
+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.
+=== Mounting screws ===
+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:
+* Metric M6, (thread size of 6 millimeters). These are larger and stronger than the #10-32 screws.
+* American #10-32, (drill size 10 and 32 threads per inch), smaller than a #12-24 screw.
+* 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>
 == References ==

19-inch rack: Difference between revisions

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