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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Spring plunger</span></span>

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<p>A <b>spring plunger</b> or <b>detent spring</b> is a <a href="Spring-loaded" class="mw-redirect" title="Spring-loaded">spring-loaded</a> mechanical part used for indexing, positioning, and securing of objects,<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> as well as for making objects possible to disassemble in normal use without losing parts. The spring force keeps the pin in position during normal use.

</p><p>Typically, it is a machine part consisting of a hollow <a href="Cylinder" title="Cylinder">cylinder</a> with an internal <a href="Compression_spring" class="mw-redirect" title="Compression spring">compression spring</a> acting on a <a href="Dowel" title="Dowel">pin</a>.<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><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> The pin may, for example, be shaped as a rod with either a cylindrical or rounded tip (broadly categorized as a <i>spring plunger</i><sup id="cite_ref-:0_4-0" class="reference"><a href="#cite_note-:0-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup>), or a spring-loaded ball (<b><a href="Ball_detent" title="Ball detent">ball plunger</a></b><sup id="cite_ref-:0_4-1" class="reference"><a href="#cite_note-:0-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup>) if the spring acts against a ball.

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

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<p>Spring plungers can be supplied as a complete unit that is mounted into the workpiece by screwing into threads, or in a pluggable version that is pressed into the workpiece. The sleeve is usually made of <a href="Free_machining_steel" class="mw-redirect" title="Free machining steel">free machining steel</a>.

</p><p>Alternatively, it can be made directly into the <a href="Workpiece" title="Workpiece">workpiece</a> by <a href="Drilling" title="Drilling">drilling</a> and <a href="Tapping_(threading)" class="mw-redirect" title="Tapping (threading)">tapping</a> a hole, then inserting a pin (or ball), spring, and finally a <a href="Set_screw" title="Set screw">set screw</a>.

</p><p>The spring force is dimensioned for the intended use. In spring plungers with a screw, the spring pressure can be adjustable within a certain working range.

</p><p>Different plungers may require different tools for installation, such as a <a href="Hex_key" title="Hex key">hex key</a>, <a href="Socket_wrench" title="Socket wrench">socket wrench</a>, or <a href="Flathead_screwdriver" class="mw-redirect" title="Flathead screwdriver">flathead screwdriver</a>. <a href="Blind_hole" class="mw-redirect" title="Blind hole">Blind hole</a> mounting variants may have tool slots on the same side as the pin.

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<div class="gallerytext">Spring plunger, cylindrical pin with rounded tip</div>

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<div class="gallerytext">Ball plunger</div>

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

<p>At high temperatures or when the parts are exposed to aggressive chemicals, plastic balls or balls made of <a href="Corrosion_resistance" class="mw-redirect" title="Corrosion resistance">corrosion-resistant</a> materials such as <a href="Silicon_nitride" title="Silicon nitride">silicon nitride</a> can be used.<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> The threaded sleeve is then typically made of <a href="Stainless_steel" title="Stainless steel">stainless steel</a> instead of carbon steel.

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<p>Spring-loaded plungers have a wide range of uses.

</p><p>Some spring plungers are designed to be handled only when assembling or occasionally adjusting equipment. Other spring plungers are designed to be routinely manipulated (for example, to adjust the angle of an <a href="Bench_(weight_training)" title="Bench (weight training)">exercise bench</a>), and may have an integrated operating lever<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> that is pushed in (<i>push pin plungers</i>) or a lever that is pulled out to manipulate the object (<i>pull pin plunger</i>).

</p><p>Similar principles are used in spring-loaded valves and <a href="Valve_stem" title="Valve stem">valve stems</a>(including <a href="Safety_valve" title="Safety valve">safety valves</a>), or automatic <a href="Ejector_(firearms)" class="mw-redirect" title="Ejector (firearms)">ejectors</a> on firearms.

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

<p>Spring plungers can be used, for example, to lock levers in different positions.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> Spring-loaded plungers with anti-twist protection enable screwless fastening.

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<div class="gallerytext">Spring plungers used to lock a lever</div>

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<div class="gallerytext">Square <a href="Socket_wrench" title="Socket wrench">socket wrench</a> with a spring-loaded ball plunger to hold the socket</div>

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<div class="gallerytext">Mechanical <a href="Spirit_level" title="Spirit level">levels</a> can often be adjusted with spring-loaded set screws</div>

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

<p>A <a href="Pogo_pin" title="Pogo pin">pogo pin</a> is a type of <a href="Electrical_element" title="Electrical element">electrical</a> connector mechanism widely used in modern electronics.<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> Compared to other electrical connectors, they have better durability and are more resistant to mechanical shock and vibration.<sup id="cite_ref-cotelec2_9-0" class="reference"><a href="#cite_note-cotelec2-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup>

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

<p>In modern <a href="Archery" title="Archery">archery</a>, an archery plunger allows the <a href="Arrow" title="Arrow">arrow</a> to be deflected as it is fired from the <a href="Bow_(weapon)" class="mw-redirect" title="Bow (weapon)">bow</a>.<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><sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup><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> It allows for adjusting the arrow's relative position on the arrow rest. By adjusting the stiffness and position of the plunger, the arrow can be adjusted to fly with the best possible flight, so that it travels straight.

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<ul><li><a href="Spring_pin" title="Spring pin">Spring pin</a>, mechanical fastener that secures the position of two or more parts relative to each other</li>

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

<li><a href="Ball_detent" title="Ball detent">Ball detent</a></li></ul>

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

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</style><cite id="CITEREFadmin2021" class="citation web cs1">admin (2021-10-07). <a rel="nofollow" class="external text" href="https://monroeengineering.com/blog/the-beginners-guide-to-spring-plungers/">"The Beginner's Guide to Spring Plungers | Hardware"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2024-12-26</span></span>.</cite></span>

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<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="https://www.reidsupply.com/en-us/industry-news/6-types-spring-plungers">"6 Types of Spring Plungers"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2024-12-26</span></span>.</cite></span>

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<li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.reidsupply.com/en-us/industry-news/difference-spring-ball-plungers">"Difference between Spring and Ball Plungers"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2024-12-26</span></span>.</cite></span>

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<li id="cite_note-:0-4"><span class="mw-cite-backlink">^ <a href="#cite_ref-:0_4-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-:0_4-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://monroeengineering.com/info-how-spring-plungers-work.php">"How Spring Plungers Work | OneMonroe"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2024-12-25</span></span>.</cite></span>

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<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="CITEREFCeramics2023" class="citation web cs1">Ceramics, G. W. (2023-09-18). <a rel="nofollow" class="external text" href="https://gwceramics.com/2023/09/18/silicon-nitride-ceramic/">"Silicon Nitride Ceramic Plungers: Outstanding Performance"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2024-12-26</span></span>.</cite></span>

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<li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><cite id="CITEREFRencol2024" class="citation news cs1">Rencol (2024-04-16). <a rel="nofollow" class="external text" href="https://www.rencol.com/news/index-plungers-a-design-engineers-guide/">"Index Plungers – A Design Engineer's Guide"</a>. <i>Rencol Components</i>.</cite></span>

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<li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text"><cite id="CITEREFHart2016" class="citation web cs1">Hart, Pierre (October 7, 2016). <a rel="nofollow" class="external text" href="https://www.javelin-tech.com/blog/2016/10/pogo-pins-3d-printed-fixtures/">"Using Pogo Pins to Add Electrical Connectivity to Your 3D Printed Fixtures"</a>. <i>Javelin</i>. Javelin Tech<span class="reference-accessdate">. Retrieved <span class="nowrap">22 May</span> 2019</span>.</cite></span>

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<li id="cite_note-cotelec2-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-cotelec2_9-0">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.cotelec.fr/media/springloadedcontactscotelec2011__097150800_1138_06052011.pdf">"Spring-Loaded Contacts & Connectors"</a> <span class="cs1-format">(PDF)</span>. <i>Cotelec</i><span class="reference-accessdate">. Retrieved <span class="nowrap">3 July</span> 2019</span>.</cite></span>

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<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://archery360.com/2020/01/22/whats-a-plunger/">"What's a Plunger?"</a>. 2020-01-22<span class="reference-accessdate">. Retrieved <span class="nowrap">2024-12-26</span></span>.</cite></span>

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<li id="cite_note-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-11">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://legendarchery.com/pages/plunger">"Archery Plunger"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2024-12-26</span></span>.</cite></span>

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<li id="cite_note-12"><span class="mw-cite-backlink"><b><a href="#cite_ref-12">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://lancasterarchery.com/blogs/news-1/olympic-archery-explained-the-plunger">"Olympic Archery Explained: The Plunger"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2024-12-26</span></span>.</cite></span>

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