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<title>Threaded insert</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Threaded insert</span></span>

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<p>A <b>threaded insert</b>, also known as a <b>threaded bushing</b> or <b>insert nut</b>, is a <a href="Fastener" title="Fastener">fastener</a> element that is inserted into an object to add a <a href="Screw_thread" title="Screw thread">threaded hole</a>.<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> They may be used to repair a stripped threaded hole, provide a durable threaded hole in a soft material, place a thread on a material too thin to accept it, <a href="Molding_(process)" title="Molding (process)">mold</a> or <a href="Casting" title="Casting">cast</a> threads into a work piece thereby eliminating a machining operation, or simplify changeover from <a href="Unified_Thread_Standard" title="Unified Thread Standard">unified</a> to <a href="ISO_metric_screw_thread" title="ISO metric screw thread">metric threads</a> or vice versa.<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>

</p><p>In woodworking, an <i>insert nut</i> provides a threaded socket for a wooden workpiece, similar to a <a href="Wall_anchor" class="mw-redirect" title="Wall anchor">wall anchor</a>. Insert nuts are inserted into a pre-drilled hole by one of two means: screw in and hammer in. In both cases, the external protrusions bite into the wood, preventing the nut from either turning or pulling out.

</p>

<div class="mw-heading mw-heading2"><h2 id="Types">Types</h2></div>

<p>Thread inserts come in many varieties, depending on the application. Threaded inserts for plastics are used in plastic materials and applied with thermal insertion or ultrasonic welding machines.

</p><p>Manufacturers of <a href="Ready-to-assemble_furniture" title="Ready-to-assemble furniture">ready-to-assemble furniture</a> often ship the parts with threaded inserts and other kinds of <a href="Knock-down_fastener" class="mw-redirect" title="Knock-down fastener">knock-down fasteners</a> pre-installed.

</p><p>People who use <a href="Sheet_metal" title="Sheet metal">sheet metal</a> or <a href="Sandwich_panel" title="Sandwich panel">sandwich panel</a> or honeycomb <a href="Sandwich-structured_composite" title="Sandwich-structured composite">sandwich-structured composite</a> often install threaded inserts to spread shear, tension, and torque loads over a larger area of the material.<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>

<div class="mw-heading mw-heading3"><h3 id="Captive_nut">Captive nut</h3></div>

<p>Captive nuts come in two basic styles. One type, the <a href="Cage_nut" title="Cage nut">cage nut</a> or <a href="Clip-on_nut" title="Clip-on nut">clip-on nut</a> is a conventional nut held captive by a sheet metal carrier that clips onto the part to be connected. These are generally used to attach screws to sheet metal parts too thin to be threaded, and

they can generally be attached, removed and reused with simple hand tools.

</p><p>The second type of captive nut is a threaded insert. These are either pressed into holes in the material to be joined or moulded in. In either case, part of the insert is generally <a href="Knurling" title="Knurling">knurled</a> to get a good grip on the material supporting the insert. One variant, the <a href="Swage_nut" title="Swage nut">swage nut</a>, has a knurled portion that <a href="Swaging" title="Swaging">swages</a> the sides of a soft metal hole to more tightly grip the nut. <a href="Press_fit" class="mw-redirect" title="Press fit">Press fit</a> and swaged captive nuts are used in panels that are too thin to be threaded or in soft materials that are too weak to be threaded. They are installed by pressing them in with an <a href="Arbor_press" title="Arbor press">arbor press</a>.<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>Threaded inserts are commonly used in plastic casings, housing, and parts to create a metal thread (typically: brass or stainless steel) to allow for screws to be used in the assembly of many consumer electronics and consumer products. These may be cast in place in <a href="Injection_molded" class="mw-redirect" title="Injection molded">injection molded</a> parts or they may be added by thermal insertion. In the latter, the insert is heated and then pressed into a hollow in the plastic part. The heat causes local melting in the plastic.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> Ultrasonic Insertion is the process used to apply vibration and pressure to install the threaded insert into a molded hollow boss (hole) of a plastic part. The ultrasonic vibrations melt the <a href="Thermoplastic" title="Thermoplastic">thermoplastic</a> material where the metal insert is in contact, and pressure is applied to press it into position. The material typically reforms around the knurled body of the threaded insert to ensure a good retention.

</p>

<div class="mw-heading mw-heading3"><h3 id="Externally-threaded_inserts">Externally-threaded inserts</h3></div>

<p>An externally threaded insert has threads on the outside and inside. The insert can be threaded into a pre-tapped hole, or a self-tapping insert creates its own threads in a drilled or molded hole. It is then anchored by various means, such as a nylon locking element. Inserts that are anchored via <a href="Loctite" title="Loctite">Loctite</a> are more commonly known by the trademarked name <i>E-Z Lok</i>.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> A thin-walled solid-bushing insert by the trademarked name <i>TIME-SERT</i> is locked in by rolling the bottom few internal thread into the base material with a special install driver which will permanently lock the insert in place. Key-locking inserts, more commonly known by the trademarked name <i>Keenserts</i>, use keys that are hammered into grooves through the threads, permanently locking the insert.<sup id="cite_ref-McMaster3204_7-0" class="reference"><a href="#cite_note-McMaster3204-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> Inserts that are self-tapping and lock via friction are more commonly known by the trademarked names Tap-lok or Speedserts.

</p>

<div class="mw-heading mw-heading3"><h3 id="Helical_insert">Helical insert</h3></div>

<p>A <b>helical insert</b> (also called a <b>screw thread insert</b> (STI), although most users call them all by one of the prominent brand names: <b>KATO®</b>, <b>Heli-Coil<sup>®</sup></b> or <b>Recoil<sup>®</sup></b>) is an insert made of <a href="Stainless_steel" title="Stainless steel">stainless steel</a> or <a href="Phosphor_bronze" title="Phosphor bronze">phosphor bronze</a> wire, with a diamond cross section, coiled to form inner and outer threads. The

coil of wire screws into a threaded hole, where it forms a smaller-diameter internal thread for a screw or stud.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> These inserts provide a convenient means of repairing stripped internal threads. These inserts are commonly sold in kits with matched <a href="Tap_and_die" title="Tap and die">taps</a> and insert tools.

</p><p>In soft materials, they are used to provide stronger threads than can be obtained by direct tapping of the base materials, e.g. aluminium, zinc die castings, wood, magnesium, plastic.

</p><p>An example application is engine repair after unintentionally destroying the threads in a socket for a spark plug by over-torquing or cross-threading.

</p>

<div class="mw-heading mw-heading3"><h3 id="Mold-in_inserts">Mold-in inserts</h3></div>

<p>A mold-in insert has a specially shaped outer surface to anchor the insert in plastic. For <a href="Injection_molding" class="mw-redirect" title="Injection molding">injection-molded</a> plastic, the insert is placed in a mold before it is filled with plastic, making an integral part. An insert can also be heated and pressed into pre-made <a href="Thermoplastic" title="Thermoplastic">thermoplastic</a> material.<sup id="cite_ref-McMaster3209_11-0" class="reference"><a href="#cite_note-McMaster3209-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup>

</p><p>For softer, more pliable plastics, hexagonal or square inserts with deep and wide grooves allow the softer plastics to hold the inserts sufficiently. The process allows large product manufacture i.e. fuel tanks, boats etc., so the torque inserts may be of large thread sizes.

</p>

<div class="mw-heading mw-heading3"><h3 id="Press-fit_inserts">Press-fit inserts</h3></div>

<p>A press-fit insert is internally threaded and has a knurled outer surface. It is pressed into a plain hole with an <i>arbor press</i>.<sup id="cite_ref-McMaster3209_11-1" class="reference"><a href="#cite_note-McMaster3209-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup>

</p>

<div class="mw-heading mw-heading3"><h3 id="Potted_inserts">Potted inserts</h3></div>

<p>A <i>potted</i> insert is set in epoxy to fix it, such as in a honeycomb sandwich panel, often used in commercial aircraft, and is said to be <i>potted in</i>.

</p>

<div class="mw-heading mw-heading2"><h2 id="Strength_factors_of_threaded_inserts">Strength factors of threaded inserts</h2></div>

<p><i>Pull-out resistance</i> & <i>torque-out resistance</i> are the two main strength factors of threaded inserts.

</p>

<ul><li>Pull-out resistance: the force required to begin to pull the insert out of the parent material</li>

<li>Torque-out: the amount of torque required to begin to turn the fastener</li></ul>

<div class="mw-heading mw-heading2"><h2 id="Installation_methods">Installation methods</h2></div>

<p>For industrial purposes, the following installation methods are the standards:

</p>

<ul><li>Thermal insertion</li>

<li>Injection molding</li>

<li>Manual pressing</li></ul>

<p>For craft purposes, they might be:

</p>

<ul><li>Screw-in type: Screw-in insert nuts have an external thread and <a href="Hex_head" class="mw-redirect" title="Hex head">hex head</a> and are screwed in with a Flat Blade Screwdriver or an <a href="Allen_wrench" class="mw-redirect" title="Allen wrench">Allen wrench</a>. The screw-in insert nuts come in various sizes and take different screw sizes. For example, an <a href="Metric_threads" class="mw-redirect" title="Metric threads">M6 insert nut</a> will take an M6 bolt, a "1/4-20" insert nut will take a 1/4-20 inch bolt., etc The pre-drilled hole must be as deep as the length of the insert nut plus any portion of the bolt that may be screwed past the end of the nut in the work piece.</li>

<li>Hammer-in type: Hammer-in insert nuts, also known as <b>knock-in nuts</b>, are lined with barbs and are hammered in. They are often made of <a href="Steel" title="Steel">steel</a>, <a href="Brass" title="Brass">brass</a> or <a href="Nylon" title="Nylon">nylon</a>. They are designed to work in wood and <a href="Particle_board" title="Particle board">particle board</a>.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup></li></ul>

<li><a href="Rivet_nut" title="Rivet nut">Rivet nut</a></li>

<li><a href="Screw" title="Screw">Screw</a></li>

<li><a href="Screw_thread" title="Screw thread">Screw thread</a></li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

<div class="mw-heading mw-heading3"><h3 id="Notes">Notes</h3></div>

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</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://rtstools.com/repairing-damaged-threads-types-of-thread-repair-inserts/">"Repairing damaged threads: Types of thread repair inserts |"</a>. <i>rtstools.com</i>. 20 July 2017<span class="reference-accessdate">. Retrieved <span class="nowrap">2017-09-30</span></span>.</cite></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"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.newmantools.com/recoil1.htm">"Newman Tools Inc"</a>. Newmantools.com<span class="reference-accessdate">. Retrieved <span class="nowrap">2012-02-29</span></span>.</cite></span>

</li>

<cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.alcoa.com/fastening_systems/aerospace/catalog/pdf/AFS_Delron_honeycomb_sandwich_panels_08_2011.pdf">"Delron Inserts for Honeycomb and Sandwich Panels"</a> <span class="cs1-format">(PDF)</span><span class="reference-accessdate">. Retrieved <span class="nowrap">2013-06-03</span></span>.</cite></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"><a href="McMaster-Carr" title="McMaster-Carr">McMaster-Carr</a>, p. <a rel="nofollow" class="external text" href="http://www.mcmaster.com/#catalog/114/3150">3150</a>.</span>

</li>

<li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><cite id="CITEREFSullivan,_G.Crawford,_L." class="citation journal cs1">Sullivan, G. & Crawford, L. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20150610201428/http://www.thermalpress.com/_data/docs/articles/janfeb03_heatstakeadvantage.pdf">"The Heat Stake Advantage"</a> <span class="cs1-format">(PDF)</span>. <i>Plastic Decorating Magazine</i> (January / February 2003). Archived from <a rel="nofollow" class="external text" href="http://www.thermalpress.com/_data/docs/articles/janfeb03_heatstakeadvantage.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2015-06-10<span class="reference-accessdate">. Retrieved <span class="nowrap">2013-04-26</span></span>.</cite></span>

</li>

<li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.ezlok.com/inserts-for-metal">"Inserts For Metal"</a>. <i>E-Z Lok</i>.</cite></span>

</li>

<li id="cite_note-McMaster3204-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-McMaster3204_7-0">^</a></b></span> <span class="reference-text">McMaster-Carr, p. <a rel="nofollow" class="external text" href="http://www.mcmaster.com/#catalog/114/3204">3204</a>.</span>

</li>

<li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text">McMaster-Carr, p. <a rel="nofollow" class="external text" href="http://www.mcmaster.com/#catalog/114/3206">3206</a>.</span>

</li>

<li id="cite_note-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-9">^</a></b></span> <span class="reference-text">McMaster-Carr, p. <a rel="nofollow" class="external text" href="http://www.mcmaster.com/#catalog/114/3207">3207</a>.</span>

</li>

<li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://blog.katoadvanex.com/what-is-a-helicoil-insert">"What is a helicoil insert?"</a>. <i>blog.katoadvanex.com</i>. 2023-09-21<span class="reference-accessdate">. Retrieved <span class="nowrap">2023-10-12</span></span>.</cite></span>

</li>

<li id="cite_note-McMaster3209-11"><span class="mw-cite-backlink">^ <a href="#cite_ref-McMaster3209_11-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-McMaster3209_11-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text">McMaster-Carr, p. <a rel="nofollow" class="external text" href="http://www.mcmaster.com/#catalog/114/3209">3209</a>.</span>

</li>

<li id="cite_note-12"><span class="mw-cite-backlink"><b><a href="#cite_ref-12">^</a></b></span> <span class="reference-text">Willacy, p. 39.</span>

</li>

</ol></div>

<div class="mw-heading mw-heading3"><h3 id="Bibliography">Bibliography</h3></div>

<ul><li><cite class="citation cs2"><i>McMaster-Carr catalog</i> (114th ed.), McMaster-Carr</cite>.</li>

<li>Sullivan, Gary & Crawford, Lance, <a rel="nofollow" class="external text" href="http://download.ebooks6.com/Plastics-Assembly-The-Heat-Stake-Advantage-download-w39437.pdf">"The Heat Stake Advantage".</a> Plastic Decorating Magazine. January/February 2003 Edition. <a href="ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/1536-9870">1536-9870</a>. (Topeka, KS: Peterson Publications, Inc.). Section: Assembly: pages 11–12, covers Sullivan & Crawford's article.</li>

<li><cite id="CITEREFWillacy1992" class="citation cs2">Willacy, David M. (1992), <a rel="nofollow" class="external text" href="https://books.google.com/books?id=xzVoc53dytwC"><i>Craft and Design in Wood</i></a>, Nelson Thornes, <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>0-7487-1066-3</bdi></cite>.</li></ul>

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</style><div id="Nuts_(hardware)34" style="font-size:114%;margin:0 4em"><a href="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="Acorn_nut" title="Acorn nut">acorn</a></li>

<li><a href="Sex_bolt" title="Sex bolt">axial barrel</a></li>

<li><a href="Barrel_nut" title="Barrel nut">barrel</a></li>

<li><a class="mw-selflink-fragment" href="#Captive_nut">captive</a></li>

<li><a href="Castellated_nut" title="Castellated nut">castellated</a></li>

<li><a href="Coupling_nut" title="Coupling nut">coupling</a></li>

<li><a href="Distorted_thread_locknut" title="Distorted thread locknut">distorted thread locknut</a></li>

<li><a href="Flange_nut" title="Flange nut">flange</a></li>

<li><a href="Frangible_nut" title="Frangible nut">frangible</a></li>

<li><a href="Insert_nut" class="mw-redirect" title="Insert nut">insert</a></li>

<li><a href="Interfering_thread_nut" title="Interfering thread nut">interfering thread</a></li>

<li><a href="Internal_wrenching_nut" title="Internal wrenching nut">internal wrenching</a></li>

<li><a href="Knurled_nut" title="Knurled nut">knurled</a></li>

<li><a href="Locknut" title="Locknut">locknut</a></li>

<li><a href="Nyloc_nut" title="Nyloc nut">nyloc</a></li>

<li><a href="Plate_nut" title="Plate nut">plate</a></li>

<li><a href="Rivet_nut" title="Rivet nut">rivet</a></li>

<li><a href="Serrated_face_nut" title="Serrated face nut">serrated face</a></li>

<li><a href="Speed_nut" title="Speed nut">speed</a></li>

<li><a href="Split_nut" title="Split nut">split</a></li>

<li><a href="Split_beam_nut" title="Split beam nut">split beam</a></li>

<li><a href="Square_nut" title="Square nut">square</a></li>

<li><a href="Swage_nut" title="Swage nut">swage</a></li>

<li><a href="Wingnut_(hardware)" title="Wingnut (hardware)">wingnut</a></li></ul>

</div></td></tr></tbody></table></div>

<div class="navbox-styles"></div><div role="navigation" class="navbox authority-control" aria-label="Navbox391" style="padding:3px"><table class="nowraplinks hlist navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Authority control databases: National </th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"><ul><li><span class="uid"><a rel="nofollow" class="external text" href="https://d-nb.info/gnd/4572642-5">Germany</a></span></li></ul></div></td></tr></tbody></table></div></div><div><div class="zim-footer">

This article is issued from <a class="external text" title="Last edited on 2025-06-21" href="https://en.wikipedia.org/wiki/?title=Threaded_insert&oldid=1296698165">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.

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