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dir="ltr"><figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Kafigmutter.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e2/Kafigmutter.jpg/225px-Kafigmutter.jpg" decoding="async" width="225" height="217" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/e2/Kafigmutter.jpg/338px-Kafigmutter.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/e2/Kafigmutter.jpg/450px-Kafigmutter.jpg 2x" data-file-width="2628" data-file-height="2540" /></a><figcaption>Cage nuts and a screw</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Tool-less_cage_nut.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/ca/Tool-less_cage_nut.jpg/220px-Tool-less_cage_nut.jpg" decoding="async" width="220" height="293" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/ca/Tool-less_cage_nut.jpg/330px-Tool-less_cage_nut.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/ca/Tool-less_cage_nut.jpg/440px-Tool-less_cage_nut.jpg 2x" data-file-width="3024" data-file-height="4032" /></a><figcaption>Newer designs of cage nuts eliminate the need for installation tools.</figcaption></figure> <p>A <b>cage nut</b> or <b>caged nut</b> (also called a <a href="/wiki/Threaded_insert#Captive_nut" title="Threaded insert">captive</a> or <a href="/wiki/Clip-on_nut" title="Clip-on nut">clip</a> nut) consists of a (usually square) <a href="/wiki/Nut_(hardware)" title="Nut (hardware)">nut</a> in a <a href="/wiki/Spring_steel" title="Spring steel">spring steel</a> cage which wraps around the nut. The cage has two wings that when compressed allow the cage to be inserted into the square holes, for example, in the mounting rails of <a href="/wiki/Equipment_rack" class="mw-redirect" title="Equipment rack">equipment racks</a>. When the wings are released, they hold the nut in position behind the hole. Cage nuts conforming to this description were patented in 1952 and 1953.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> The original design requires an insertion tool to install a cage nut into a hole. Newer designs featuring squeeze-and-release tabs allow for tool-less installation.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Usage">Usage</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Cage_nut&action=edit&section=1" title="Edit section: Usage"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The square-hole cage nut can be used wherever a square hole can be punched. An older type of captive nut uses a spring clip that holds the nut and slides on the edge of a thin sheet. While this type of cage nut can only position the nut a fixed distance from the edge of a thin plate, it works equally well with square and round holes. A patent for such a nut was granted in 1946.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p><p>Using cage nuts provides several benefits over threaded holes. It permits a range of choice of nut and bolt size (e.g. metric vs English) in the field, long after the equipment has been manufactured. Second, if a screw is over-tightened, the nut can be replaced, unlike a pre-threaded hole, where a hole with stripped threads becomes unusable. Third, cage nuts are easy to use on materials too thin or soft to be threaded. </p><p>The nut is usually slightly loose in the cage to allow for minor adjustments in alignment. This reduces the likelihood that the threads will be stripped during equipment installation and removal. The dimensions of the spring steel clip determine thickness of the panel to which the nut may be clipped. In the case of square-hole cage nuts, the clip dimensions determine the range of hole sizes to which the clip will securely hold the nut. In the case of slide-on cage nuts, the clip dimensions determine the distance from the panel edge to the hole. </p> <div class="mw-heading mw-heading2"><h2 id="Applications">Applications</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Cage_nut&action=edit&section=2" title="Edit section: Applications"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A common use for cage nuts is to mount equipment in square-holed <a href="/wiki/19-inch_rack" title="19-inch rack">19-inch racks</a> (the most common type), with 0.375 inches (9.5 mm) square-hole size. There are four common sizes: <a href="/wiki/Unified_Thread_Standard" title="Unified Thread Standard">UNF 10–32</a> and, to a lesser extent, <a href="/wiki/Unified_Thread_Standard" title="Unified Thread Standard">UNC 12–24</a> are generally used in the United States; elsewhere, <a href="/wiki/ISO_metric_screw_thread" title="ISO metric screw thread">M5</a> (5 mm outside diameter and 0.8 mm pitch) for light and medium equipment and <a href="/wiki/ISO_metric_screw_thread" title="ISO metric screw thread">M6</a> for heavier equipment, such as servers. </p><p>Although some modern rack-mount equipment has bolt-free mounting compatible with square-hole racks, many rack-mount components are generally mounted with cage nuts. </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Cage_nut&action=edit&section=3" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Threaded_insert" title="Threaded insert">Threaded insert</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Cage_nut&action=edit&section=4" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text">Laurence H. Flora, Jr., <i>Combined Nut Retainer and Thread Lock</i>, <span><a rel="nofollow" class="external text" href="https://patents.google.com/patent/US2587134">U.S. patent 2,587,134</a></span>, granted Feb. 26, 1952.</span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text">William A. Bedford, Jr., <i>Cage Nut</i>, <span><a rel="nofollow" class="external text" href="https://patents.google.com/patent/US2627294">U.S. patent 2,627,294</a></span>, granted Feb. 3, 1953.</span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.cablinginstall.com/articles/2016/08/chatsworth-products-clik-nut-cage-nuts.html">"CPI's Clik-Nut is a tool-less alternative to traditional cage nuts"</a>. <i>www.cablinginstall.com</i><span class="reference-accessdate">. Retrieved <span class="nowrap">2018-04-25</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.cablinginstall.com&rft.atitle=CPI%E2%80%99s+Clik-Nut+is+a+tool-less+alternative+to+traditional+cage+nuts&rft_id=http%3A%2F%2Fwww.cablinginstall.com%2Farticles%2F2016%2F08%2Fchatsworth-products-clik-nut-cage-nuts.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ACage+nut" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text">George A. Tinnerman, <i>Fastening Device</i>, <span><a rel="nofollow" class="external text" href="https://patents.google.com/patent/US2394729">U.S. patent 2,394,729</a></span>, granted Feb. 12, 1946.</span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Cage_nut&action=edit&section=5" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20161220113837/http://www.stayonline.com/static/whitepapers/sol-wp-cage-nuts.pdf">Sizing Table for 10/32, 12/24, M5, and M6 Cage Nuts</a></li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist 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href="/wiki/Template:Nuts_(hardware)" title="Template:Nuts (hardware)"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Nuts_(hardware)" title="Template talk:Nuts (hardware)"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Nuts_(hardware)" title="Special:EditPage/Template:Nuts (hardware)"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Nuts_(hardware)" style="font-size:114%;margin:0 4em"><a href="/wiki/Nut_(hardware)" title="Nut (hardware)">Nuts (hardware)</a></div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Acorn_nut" title="Acorn nut">acorn</a></li> <li><a href="/wiki/Sex_bolt" title="Sex bolt">axial barrel</a></li> <li><a href="/wiki/Barrel_nut" title="Barrel nut">barrel</a></li> <li><a class="mw-selflink selflink">cage</a></li> <li><a href="/wiki/Threaded_insert#Captive_nut" title="Threaded insert">captive</a></li> <li><a href="/wiki/Castellated_nut" title="Castellated nut">castellated</a></li> <li><a href="/wiki/Clip-on_nut" title="Clip-on nut">clip-on</a></li> <li><a href="/wiki/Coupling_nut" title="Coupling nut">coupling</a></li> <li><a href="/wiki/Distorted_thread_locknut" title="Distorted thread locknut">distorted thread locknut</a></li> <li><a href="/wiki/Flange_nut" title="Flange nut">flange</a></li> <li><a href="/wiki/Frangible_nut" title="Frangible nut">frangible</a></li> <li><a href="/wiki/Insert_nut" title="Insert nut">insert</a></li> <li><a href="/wiki/Interfering_thread_nut" title="Interfering thread nut">interfering thread</a></li> <li><a href="/wiki/Internal_wrenching_nut" title="Internal wrenching nut">internal wrenching</a></li> <li><a href="/wiki/Jam_nut" title="Jam nut">jam</a></li> <li><a href="/wiki/Jet_nut" title="Jet nut">jet</a></li> <li><a href="/wiki/Keps_nut" title="Keps nut">Keps</a></li> <li><a href="/wiki/Knurled_nut" title="Knurled nut">knurled</a></li> <li><a href="/wiki/Locknut" title="Locknut">locknut</a></li> <li><a href="/wiki/Lug_nut" title="Lug nut">lug</a></li> <li><a href="/wiki/Nyloc_nut" title="Nyloc nut">nyloc</a></li> <li><a href="/wiki/Plate_nut" title="Plate nut">plate</a></li> <li><a href="/wiki/Rivet_nut" title="Rivet nut">rivet</a></li> <li><a href="/wiki/Serrated_face_nut" title="Serrated face nut">serrated face</a></li> <li><a href="/wiki/Speed_nut" title="Speed nut">speed</a></li> <li><a href="/wiki/Split_nut" title="Split nut">split</a></li> <li><a href="/wiki/Split_beam_nut" title="Split beam nut">split beam</a></li> <li><a href="/wiki/Square_nut" title="Square nut">square</a></li> <li><a href="/wiki/Swage_nut" title="Swage nut">swage</a></li> <li><a href="/wiki/T-nut" title="T-nut">T-nut</a></li> <li><a href="/wiki/T-slot_nut" title="T-slot nut">T-slot</a></li> <li><a href="/wiki/Weld_nut" title="Weld nut">weld</a></li> <li><a href="/wiki/Well_nut" title="Well nut">well</a></li> <li><a href="/wiki/Wingnut_(hardware)" title="Wingnut (hardware)">wingnut</a></li></ul> </div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Cage_nut&oldid=1191513185">https://en.wikipedia.org/w/index.php?title=Cage_nut&oldid=1191513185</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a href="/w/index.php?title=Category:Pages_using_the_JsonConfig_extension&action=edit&redlink=1" class="new" title="Category:Pages using the JsonConfig extension (page does not exist)">Pages using the JsonConfig 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