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class="vector-toc-numb">3</span> <span>Office equipment and supplies</span> </div> </a> <button aria-controls="toc-Office_equipment_and_supplies-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Office equipment and supplies subsection</span> </button> <ul id="toc-Office_equipment_and_supplies-sublist" class="vector-toc-list"> <li id="toc-ISO_216_paper_sizes" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#ISO_216_paper_sizes"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>ISO 216 paper sizes</span> </div> </a> <ul id="toc-ISO_216_paper_sizes-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Manufacturing" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Manufacturing"> <div class="vector-toc-text"> <span 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<span>ISO 1307 plastic hose sizes</span> </div> </a> <ul id="toc-ISO_1307_plastic_hose_sizes-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-ISO_6708_nominal_pipe_diameter" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#ISO_6708_nominal_pipe_diameter"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.3</span> <span>ISO 6708 nominal pipe diameter</span> </div> </a> <ul id="toc-ISO_6708_nominal_pipe_diameter-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div 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<div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Metricated industry standards</div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Engineering_design_drawings.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/32/Engineering_design_drawings.jpg/220px-Engineering_design_drawings.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/32/Engineering_design_drawings.jpg/330px-Engineering_design_drawings.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/32/Engineering_design_drawings.jpg/440px-Engineering_design_drawings.jpg 2x" data-file-width="1280" data-file-height="960" /></a><figcaption>Use of preferred metric sizes is common in engineering designs</figcaption></figure> <p><b>Preferred metric sizes</b> are a set of <a href="/wiki/International_standard" title="International standard">international standards</a> and <a href="/wiki/De_facto_standard" title="De facto standard">de facto standards</a> that are designed to make using the metric system easier and simpler, especially in engineering and construction practices. One of the methods used to arrive at these preferred sizes is the use of <a href="/wiki/Preferred_number" title="Preferred number">preferred numbers</a> and <a href="/wiki/Convenient_number" title="Convenient number">convenient numbers</a>, such as the <a href="/wiki/Renard_series" title="Renard series">Renard series</a> and <a href="/wiki/1-2-5_series" class="mw-redirect" title="1-2-5 series">1-2-5 series</a>, to limit the number of different sizes of components needed. </p><p>One of the largest benefits of such limits is an ensuing multiplicative or exponential reduction in the number of parts, tools and other items needed to support the installation and maintenance of the items built using these techniques. This occurs because eliminating one diameter fastener will typically allow the elimination of a large number of variations on that diameter (multiple thread pitches, multiple lengths, multiple tip types, multiple head types, multiple drive types, and the tools needed for installing each, including multiple drill bits (one for each different thread pitch, material, and fit combination). </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Food_and_beverages">Food and beverages</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Preferred_metric_sizes&action=edit&section=1" title="Edit section: Food and beverages"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Mo%C3%ABt_%26_Chandon_in_different_sizes.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Mo%C3%ABt_%26_Chandon_in_different_sizes.jpg/220px-Mo%C3%ABt_%26_Chandon_in_different_sizes.jpg" decoding="async" width="220" height="150" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Mo%C3%ABt_%26_Chandon_in_different_sizes.jpg/330px-Mo%C3%ABt_%26_Chandon_in_different_sizes.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Mo%C3%ABt_%26_Chandon_in_different_sizes.jpg/440px-Mo%C3%ABt_%26_Chandon_in_different_sizes.jpg 2x" data-file-width="2002" data-file-height="1364" /></a><figcaption>Champagne bottles in various sizes, probably 200 ml, 375 ml, 750 ml, 1.5 L, 3 L, 6 L, 9 L, 12 L and 18 L.</figcaption></figure> <div class="mw-heading mw-heading3"><h3 id="Liquor_bottle_sizes">Liquor bottle sizes</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Preferred_metric_sizes&action=edit&section=2" title="Edit section: Liquor bottle sizes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>International agreements, including 75/106/EEC,<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> specify the capacities of liquor bottles allowed in international commerce as the following 10 sizes: </p> <ul><li>100 ml (<style data-mw-deduplicate="TemplateStyles:r1154941027">.mw-parser-output .frac{white-space:nowrap}.mw-parser-output .frac .num,.mw-parser-output .frac .den{font-size:80%;line-height:0;vertical-align:super}.mw-parser-output .frac .den{vertical-align:sub}.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);clip-path:polygon(0px 0px,0px 0px,0px 0px);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}</style><span class="frac"><span class="num">1</span>⁄<span class="den">10</span></span> L)</li> <li>250 ml (<link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac"><span class="num">1</span>⁄<span class="den">4</span></span> L)</li> <li>375 ml (<link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac"><span class="num">3</span>⁄<span class="den">8</span></span> L)</li> <li>500 ml (<link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac"><span class="num">1</span>⁄<span class="den">2</span></span> L)</li> <li>750 ml (<link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac"><span class="num">3</span>⁄<span class="den">4</span></span> L)</li> <li>1 L</li> <li>1.5 L</li> <li>2 L</li> <li>3 L</li> <li>5 L</li></ul> <p>In the United States, the alcohol industry switched to metric bottle sizes on October 1, 1976, abandoning the existing 38 sizes of bottles and instead adopting the following 6 sizes:<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> <ul><li>50 mL (miniature)</li> <li>200 mL (replaced the half-pint) (≈237 mL is a U.S. half-pint)</li> <li>500 mL (replaced the pint) (≈473 mL is a U.S. pint)</li> <li>750 mL (replaced the fifth) (≈757 mL is a U.S. fifth)</li> <li>1000 mL (replaced the quart) (≈946 mL is a U.S. quart)</li> <li>1750 mL (replaced the half-gallon) (≈1893 mL is a half U.S. gallon)</li></ul> <div class="mw-heading mw-heading2"><h2 id="Building_construction">Building construction</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Preferred_metric_sizes&action=edit&section=3" title="Edit section: Building construction"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="System_32_furniture">System 32 furniture</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Preferred_metric_sizes&action=edit&section=4" title="Edit section: System 32 furniture"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:2017_UEF_Joensuu_library_06_shelf.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/be/2017_UEF_Joensuu_library_06_shelf.jpg/220px-2017_UEF_Joensuu_library_06_shelf.jpg" decoding="async" width="220" height="337" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/be/2017_UEF_Joensuu_library_06_shelf.jpg/330px-2017_UEF_Joensuu_library_06_shelf.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/b/be/2017_UEF_Joensuu_library_06_shelf.jpg 2x" data-file-width="400" data-file-height="613" /></a><figcaption><a href="/wiki/Shelf_(storage)" title="Shelf (storage)">Shelf</a> where the shelf bearing holes are placed with 32 mm distances from center to center, giving flexible choices for shelve positioning.</figcaption></figure> <p><a href="/wiki/System_32_(furniture)" class="mw-redirect" title="System 32 (furniture)">System 32</a> is a standard for the design and manufacture of furniture, most commonly used in the design of cabinets, wherein the major parts (sides, doors, etc.) are available in increments of 32 mm, and shelf supports consist of columns of 5 mm holes on 32 mm centers. </p> <div class="mw-heading mw-heading3"><h3 id="ISO_2848_basic_module">ISO 2848 basic module</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Preferred_metric_sizes&action=edit&section=5" title="Edit section: ISO 2848 basic module"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Bjelkelag_illustrasjon_P1.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Bjelkelag_illustrasjon_P1.png/220px-Bjelkelag_illustrasjon_P1.png" decoding="async" width="220" height="121" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Bjelkelag_illustrasjon_P1.png/330px-Bjelkelag_illustrasjon_P1.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Bjelkelag_illustrasjon_P1.png/440px-Bjelkelag_illustrasjon_P1.png 2x" data-file-width="1214" data-file-height="668" /></a><figcaption>Cross section of a wooden <a href="/w/index.php?title=Joist_layer&action=edit&redlink=1" class="new" title="Joist layer (page does not exist)">joist layer</a>, where 6 M (or 6 modules) indicates a distance of 600 mm.</figcaption></figure> <p>The <a href="/wiki/ISO_2848" title="ISO 2848">ISO 2848</a> basic module is a unit of 100 mm, often represented by a single capital "M", along with 300 mm and 600 mm groupings, that is widely used for the widths of furniture in Europe. </p> <ul><li>A standard metric (concrete) block is 190 mm wide, 390 mm long, and 190 mm high, which allows for 10 mm mortar joints in between bricks, giving a standard unit size of 200 mm square by 400 mm long.<sup id="cite_ref-:0_3-0" class="reference"><a href="#cite_note-:0-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup></li> <li>A standard metric brick is 90 by 57 by 190 mm; with 10 mm of mortar, that produces a standard unit of 100 mm x 200 mm.<sup id="cite_ref-:0_3-1" class="reference"><a href="#cite_note-:0-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup></li></ul> <div class="mw-heading mw-heading2"><h2 id="Office_equipment_and_supplies">Office equipment and supplies</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Preferred_metric_sizes&action=edit&section=6" title="Edit section: Office equipment and supplies"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:A_size_illustration2.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/16/A_size_illustration2.svg/150px-A_size_illustration2.svg.png" decoding="async" width="150" height="205" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/16/A_size_illustration2.svg/225px-A_size_illustration2.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/16/A_size_illustration2.svg/300px-A_size_illustration2.svg.png 2x" data-file-width="2316" data-file-height="3162" /></a><figcaption><a href="/wiki/ISO_216" title="ISO 216">A-series paper sizes</a>.</figcaption></figure> <div class="mw-heading mw-heading3"><h3 id="ISO_216_paper_sizes">ISO 216 paper sizes</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Preferred_metric_sizes&action=edit&section=7" title="Edit section: ISO 216 paper sizes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/wiki/ISO_216" title="ISO 216">ISO 216</a> standard specifies the A sizes of paper, including the very common A4, wherein the base size of A0 is one square meter, and the ratio between the height and width is <span class="nowrap">√<span style="border-top:1px solid; padding:0 0.1em;">2</span></span>, which results in all sizes of paper having the same aspect ratio. </p><p>Also related is the set of pen thicknesses for technical drawings (0.13, 0.18, 0.25, 0.35, 0.50, 0.70, 1.00, 1.40, and 2.00 mm). </p> <div class="mw-heading mw-heading2"><h2 id="Manufacturing">Manufacturing</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Preferred_metric_sizes&action=edit&section=8" title="Edit section: Manufacturing"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="ISO_261_and_262_fastener_diameters">ISO 261 and 262 fastener diameters</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Preferred_metric_sizes&action=edit&section=9" title="Edit section: ISO 261 and 262 fastener diameters"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/ISO_metric_screw_thread" title="ISO metric screw thread">ISO metric screw thread</a></div> <p>ISO 261 defines a set of preferred metric machine screw/bolt sizes, and <a href="/wiki/ISO_262" class="mw-redirect" title="ISO 262">ISO 262</a> defines a subset of those; both are based roughly on <a href="/wiki/Renard_series" title="Renard series">Renard series</a> as defined in <a href="/wiki/ISO_3" class="mw-redirect" title="ISO 3">ISO 3</a>, <a href="/wiki/ISO_17" class="mw-redirect" title="ISO 17">ISO 17</a>, and <a href="/wiki/ISO_497" class="mw-redirect" title="ISO 497">ISO 497</a>. Given that even ISO 262 specifies a fairly large set of diameters, a much simplified set of preferred diameters was developed by one of the lead designers of <a href="/w/index.php?title=ASME_Z17.1&action=edit&redlink=1" class="new" title="ASME Z17.1 (page does not exist)">ASME Z17.1</a> and ANSI B4.2, Knut O. Kverneland, to reduce the list to 6 preferred sizes, and another 6 intermediate supplementary sizes.<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> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Aneka_Macam_Mur_dan_Baut.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Aneka_Macam_Mur_dan_Baut.jpg/220px-Aneka_Macam_Mur_dan_Baut.jpg" decoding="async" width="220" height="147" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Aneka_Macam_Mur_dan_Baut.jpg/330px-Aneka_Macam_Mur_dan_Baut.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Aneka_Macam_Mur_dan_Baut.jpg/440px-Aneka_Macam_Mur_dan_Baut.jpg 2x" data-file-width="3002" data-file-height="2000" /></a><figcaption>Machine screws with different thread diameters</figcaption></figure> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:1st_choice_metric_hex_key_set.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/51/1st_choice_metric_hex_key_set.jpg/220px-1st_choice_metric_hex_key_set.jpg" decoding="async" width="220" height="339" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/51/1st_choice_metric_hex_key_set.jpg/330px-1st_choice_metric_hex_key_set.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/51/1st_choice_metric_hex_key_set.jpg/440px-1st_choice_metric_hex_key_set.jpg 2x" data-file-width="2608" data-file-height="4016" /></a><figcaption>Hex key set with metric sizes from 2 mm to 10 mm according to sizes for use with ISO 262 screw sizes (except 3.5 mm for M6 internal set screw)</figcaption></figure> <p>For each size bolt or screw and type of head, there is a corresponding size driver prescribed by various ISO standards, including: </p> <ul><li>Internal hex drive: ISO 2936:2014 "Assembly tools for screws and nuts—Hexagon socket screw keys"<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></li> <li>External hex drive: ISO 4014, 4016, 4017, and 4018<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></li></ul> <table class="wikitable"> <tbody><tr> <th>ISO 262 sizes </th> <th>Internal hex<br />cap head </th> <th>Internal hex<br />button head </th> <th>Internal hex<br />flat head screws </th> <th>Internal hex<br />set screws </th> <th>External hex<br />ISO standard </th> <th>External hex<br />DIN standard </th></tr> <tr> <td>M2.5 </td> <td>2.0 mm </td> <td> </td> <td> </td> <td>2.0 mm </td> <td>5 mm </td> <td>5 mm </td></tr> <tr> <td>M3 </td> <td>2.5 mm </td> <td>2.0 mm </td> <td>2.0 mm </td> <td>2.0 mm </td> <td>5.5mm </td> <td>5.5mm </td></tr> <tr> <td>M4 </td> <td>3.0 mm </td> <td>2.5 mm </td> <td>2.5 mm </td> <td>2.5 mm </td> <td>7 mm </td> <td>7 mm </td></tr> <tr> <td>M5 </td> <td>4.0 mm </td> <td>3.0 mm </td> <td>3.0 mm </td> <td>3.0 mm </td> <td>8 mm </td> <td>8 mm </td></tr> <tr> <td>M6 </td> <td>5.0 mm </td> <td>4.0 mm </td> <td>4.0 mm </td> <td>3.5 mm </td> <td>10 mm </td> <td>10 mm </td></tr> <tr> <td>M8 </td> <td>6.0 mm </td> <td>5.0 mm </td> <td>5.0 mm </td> <td>5.0 mm </td> <td>13 mm </td> <td>13 mm </td></tr> <tr> <td>M10 </td> <td>8.0 mm </td> <td>6.0 mm </td> <td>6.0 mm </td> <td>6.0 mm </td> <td>16 mm </td> <td>17 mm </td></tr> <tr> <td>M12 </td> <td>10.0 mm </td> <td>8.0 mm </td> <td>8.0 mm </td> <td>8.0 mm </td> <td>18 mm </td> <td>19 mm </td></tr> <tr> <td>M16 </td> <td>14.0 mm </td> <td>10.0 mm </td> <td>10.0 mm </td> <td>10.0 mm </td> <td>24 mm </td> <td>24 mm </td></tr> <tr> <td>M20 </td> <td>17.0 mm </td> <td> </td> <td>12.0 mm </td> <td>12.0 mm </td> <td>30 mm </td> <td>30 mm </td></tr> <tr> <td>M24 </td> <td>19.0 mm </td> <td> </td> <td> </td> <td> </td> <td>36 mm </td> <td>36 mm </td></tr> <tr> <td>M30 </td> <td>22.0 mm </td> <td> </td> <td> </td> <td> </td> <td>46 mm </td> <td>46 mm </td></tr></tbody></table> <p>For Torx bolts, there is a corresponding size driver prescribed by Acument, the designer of the Torx drive system. As of 2018<sup class="plainlinks noexcerpt noprint asof-tag update" style="display:none;"><a class="external text" href="https://en.wikipedia.org/w/index.php?title=Preferred_metric_sizes&action=edit">[update]</a></sup>, there are no ISO standards for hexalobular drive sizes.<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> </p> <table class="wikitable"> <tbody><tr> <th>ISO 262 sizes </th> <th>Pan head </th> <th>Flat head </th> <th>Socket head </th> <th>Socket Button </th> <th>Truss </th> <th>External Torx </th></tr> <tr> <td>M2.5 </td> <td>T8 </td> <td>T8 </td> <td>T8 </td> <td> </td> <td> </td> <td> </td></tr> <tr> <td>M3 </td> <td>T10 </td> <td>T10 </td> <td>T10 </td> <td>T8 </td> <td> </td> <td>E4 </td></tr> <tr> <td>M4 </td> <td>T20 </td> <td>T20 </td> <td>T25 </td> <td>T15 </td> <td>T15 </td> <td>E5 </td></tr> <tr> <td>M5 </td> <td>T25 </td> <td>T25 </td> <td>T27 </td> <td>T25 </td> <td>T20 </td> <td>E6 </td></tr> <tr> <td>M6 </td> <td>T30 </td> <td>T30 </td> <td>T30 </td> <td>T27 </td> <td>T30 </td> <td>E8 </td></tr> <tr> <td>M8 </td> <td>T40 </td> <td>T40 </td> <td>T45 </td> <td>T40 </td> <td>T40 </td> <td>E10 </td></tr> <tr> <td>M10 </td> <td>T50 </td> <td>T50 </td> <td>T50 </td> <td>T45 </td> <td>T50 </td> <td>E12 </td></tr> <tr> <td>M12 </td> <td> </td> <td> </td> <td>T55 </td> <td>T55 </td> <td>T55 </td> <td>E14 </td></tr> <tr> <td>M16 </td> <td> </td> <td> </td> <td>T70 </td> <td>T60 </td> <td> </td> <td>E20 </td></tr> <tr> <td>M20 </td> <td> </td> <td> </td> <td>T90 </td> <td> </td> <td> </td> <td>E24 </td></tr> <tr> <td>M24 </td> <td> </td> <td> </td> <td>T100 </td> <td> </td> <td> </td> <td>E32 </td></tr> <tr> <td>M30 </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td>E36 </td></tr></tbody></table> <p>Similarly, for Torx Plus bolts, there is a corresponding size driver prescribed by Acument, the designer of the Torx Plus drive system. As of 2018<sup class="plainlinks noexcerpt noprint asof-tag update" style="display:none;"><a class="external text" href="https://en.wikipedia.org/w/index.php?title=Preferred_metric_sizes&action=edit">[update]</a></sup>, there are no ISO standards for hexalobular drive sizes.<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> </p> <table class="wikitable"> <tbody><tr> <th>ISO 262 sizes </th> <th>Pan head </th> <th>Flat head </th> <th>Socket head </th> <th>Socket Button </th> <th>Truss </th> <th>External Torx </th></tr> <tr> <td>M2.5 </td> <td>8IP </td> <td>8IP </td> <td>8IP </td> <td> </td> <td> </td> <td>4EP </td></tr> <tr> <td>M3 </td> <td>10IP </td> <td>10IP </td> <td>10IP </td> <td>8IP </td> <td> </td> <td>5EP </td></tr> <tr> <td>M4 </td> <td>20IP </td> <td>15IP </td> <td>20IP </td> <td>15IP </td> <td>15IP </td> <td>7EP </td></tr> <tr> <td>M5 </td> <td>25IP </td> <td>20IP </td> <td>27IP </td> <td>25IP </td> <td>20IP </td> <td>8EP </td></tr> <tr> <td>M6 </td> <td>30IP </td> <td>27IP </td> <td>30IP </td> <td>27IP </td> <td>30IP </td> <td>10EP </td></tr> <tr> <td>M8 </td> <td>45IP </td> <td>30IP </td> <td>45IP </td> <td>40IP </td> <td>40IP </td> <td>14EP </td></tr> <tr> <td>M10 </td> <td>50IP </td> <td>50IP </td> <td>50IP </td> <td>45IP </td> <td>50IP </td> <td>16EP </td></tr> <tr> <td>M12 </td> <td>55IP </td> <td>55IP </td> <td>55IP </td> <td>55IP </td> <td>55IP </td> <td>20EP </td></tr> <tr> <td>M16 </td> <td> </td> <td> </td> <td>70IP </td> <td>60IP </td> <td> </td> <td>26EP </td></tr> <tr> <td>M20 </td> <td> </td> <td> </td> <td>90IP </td> <td> </td> <td> </td> <td>32EP </td></tr> <tr> <td>M24 </td> <td> </td> <td> </td> <td>100IP </td> <td> </td> <td> </td> <td>40EP </td></tr> <tr> <td>M30 </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td></tr></tbody></table> <div class="mw-heading mw-heading3"><h3 id="ISO_1307_plastic_hose_sizes">ISO 1307 plastic hose sizes</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Preferred_metric_sizes&action=edit&section=10" title="Edit section: ISO 1307 plastic hose sizes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Garden_hose_pistol.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/92/Garden_hose_pistol.JPG/220px-Garden_hose_pistol.JPG" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/92/Garden_hose_pistol.JPG/330px-Garden_hose_pistol.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/92/Garden_hose_pistol.JPG/440px-Garden_hose_pistol.JPG 2x" data-file-width="3264" data-file-height="2448" /></a><figcaption>Garden hose with mouthpiece</figcaption></figure> <p>See also: </p> <ul><li><a href="#ISO_6708_Nominal_Diameter">ISO 6708 Nominal Diameter</a> (for garden hose sizes)</li></ul> <p>ISO 1307:2006, Rubber and plastics hoses—Hose sizes, minimum and maximum inside diameters, and tolerances on cut-to-length hoses specifies nominal diameters for four different types of plastic hoses, including "Type C", which includes the typical <a href="/wiki/Garden_hose" title="Garden hose">garden hose</a>. Each nominal diameter specifies different ID minimum and maximum values. The nominal size is a <a href="/wiki/Renard_series" title="Renard series">Renard series</a>. </p> <table class="wikitable"> <tbody><tr> <th>Nominal Size <p>ID </p> </th> <th colspan="2">Type C <p>Non-mandrel-built </p><p>ID range </p> </th> <th>Inch <p>equivalent </p><p>ID </p> </th></tr> <tr> <th> </th> <th>min </th> <th>max </th> <th> </th></tr> <tr> <td>3.2 </td> <td>n/a </td> <td>n/a </td> <td> </td></tr> <tr> <td>4 </td> <td>3.4 </td> <td>4.6 </td> <td> </td></tr> <tr> <td>5 </td> <td>4.2 </td> <td>5.4 </td> <td> </td></tr> <tr> <td>6.3 </td> <td>5.6 </td> <td>7.2 </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac"><span class="num">1</span>⁄<span class="den">8</span></span> in </td></tr> <tr> <td>8 </td> <td>7.2 </td> <td>8.8 </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac"><span class="num">1</span>⁄<span class="den">4</span></span> in </td></tr> <tr> <td>10 </td> <td>8.7 </td> <td>10.3 </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac"><span class="num">3</span>⁄<span class="den">8</span></span> in </td></tr> <tr> <td>12.5 </td> <td>11.9 </td> <td>13.5 </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac"><span class="num">1</span>⁄<span class="den">2</span></span> in </td></tr> <tr> <td>16 </td> <td>15.1 </td> <td>16.7 </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac"><span class="num">5</span>⁄<span class="den">8</span></span> in </td></tr> <tr> <td>19 </td> <td>18.3 </td> <td>19.9 </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac"><span class="num">3</span>⁄<span class="den">4</span></span> in </td></tr> <tr> <td>20 </td> <td>19.3 </td> <td>20.9 </td> <td> </td></tr> <tr> <td>25 </td> <td>24.2 </td> <td>26.6 </td> <td>1 in </td></tr> <tr> <td>31.5 </td> <td>30.2 </td> <td>33.4 </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac">1<span class="sr-only">+</span><span class="num">1</span>⁄<span class="den">4</span></span> in </td></tr> <tr> <td>38 </td> <td>36.5 </td> <td>39.7 </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac">1<span class="sr-only">+</span><span class="num">1</span>⁄<span class="den">2</span></span> in </td></tr></tbody></table> <div class="mw-heading mw-heading3"><h3 id="ISO_6708_nominal_pipe_diameter">ISO 6708 nominal pipe diameter</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Preferred_metric_sizes&action=edit&section=11" title="Edit section: ISO 6708 nominal pipe diameter"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><span class="anchor" id="ISO_6708"></span> </p> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Butterfly-valve--The-Alloy-Valve-Stockist.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5b/Butterfly-valve--The-Alloy-Valve-Stockist.JPG/220px-Butterfly-valve--The-Alloy-Valve-Stockist.JPG" decoding="async" width="220" height="330" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5b/Butterfly-valve--The-Alloy-Valve-Stockist.JPG/330px-Butterfly-valve--The-Alloy-Valve-Stockist.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5b/Butterfly-valve--The-Alloy-Valve-Stockist.JPG/440px-Butterfly-valve--The-Alloy-Valve-Stockist.JPG 2x" data-file-width="2336" data-file-height="3504" /></a><figcaption><a href="/wiki/Butterfly_valve" title="Butterfly valve">Butterfly valve</a> in a large <a href="/wiki/Nominal_Pipe_Size" title="Nominal Pipe Size">DN-size</a>.</figcaption></figure> <p>Nominal diameter, abbreviated DN (diamètre nominal/Durchmesser nach Norm), is the designation system specified by ISO 6708 for specifying the diameter of trade sizes of metric pipework components, and is the metric equivalent to <a href="/wiki/Nominal_Pipe_Size" title="Nominal Pipe Size">Nominal Pipe Size</a>.<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> It is among several ISO specifications that formalize <a href="/wiki/Preferred_number" title="Preferred number">preferred numbers</a>, and is referred to by numerous other international standards, including ISO 7598 and EN 10255. The complete set of DN values allowed by the standard are: </p> <table class="wikitable"> <tbody><tr> <th>DN designation </th> <th>DN designation </th> <th>DN designation </th></tr> <tr> <td>DN 10 </td> <td>DN 250 </td> <td>DN 1 500 </td></tr> <tr> <td>DN 15 </td> <td>DN 300 </td> <td>DN 1 600 </td></tr> <tr> <td>DN 20 </td> <td>DN 350 </td> <td>DN 1 800 </td></tr> <tr> <td>DN 25 </td> <td>DN 400 </td> <td>DN 2 000 </td></tr> <tr> <td>DN 32 </td> <td>DN 450 </td> <td>DN 2 200 </td></tr> <tr> <td>DN 40 </td> <td>DN 500 </td> <td>DN 2 400 </td></tr> <tr> <td>DN 50 </td> <td>DN 600 </td> <td>DN 2 600 </td></tr> <tr> <td>DN 60 </td> <td>DN 700 </td> <td>DN 2 800 </td></tr> <tr> <td>DN 65 </td> <td>DN 800 </td> <td>DN 3000 </td></tr> <tr> <td>DN 80 </td> <td>DN 900 </td> <td>DN 3200 </td></tr> <tr> <td>DN 100 </td> <td>DN 1 000 </td> <td>DN 3 400 </td></tr> <tr> <td>DN 125 </td> <td>DN 1 100 </td> <td>DN 3 600 </td></tr> <tr> <td>DN 150 </td> <td>DN 1 200 </td> <td>DN 3 800 </td></tr> <tr> <td>DN 200 </td> <td>DN 1 400 </td> <td>DN 4 000 </td></tr></tbody></table> <p>The number following the DN is a <a href="/wiki/Real_versus_nominal_value" title="Real versus nominal value">nominal value</a> that is roughly the number of millimeters of a circular feature on the connection point of the pipe, fitting, coupling, etc., but often differing by a noticeable amount. If the DN value is related to the internal bore diameter of the feature, the size should be represented by DN/ID (for Inside Diameter), and if the DN value is related to the outside diameter, the size should be represented by DN/OD (for Outside Diameter). </p><p>The relationship between DN and <a href="/wiki/Nominal_Pipe_Size" title="Nominal Pipe Size">NPS</a> pipe sizes are as follows. Note that the actual internal diameter varies depending on the pipe wall thickness.<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> </p> <table class="wikitable"> <tbody><tr> <th>DN </th> <th>Actual OD </th> <th>NPS<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> </th></tr> <tr> <th>designation </th> <th>mm </th> <th>designation </th></tr> <tr> <td>DN 10 </td> <td>17.2 </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac"><span class="num">3</span>⁄<span class="den">8</span></span> </td></tr> <tr> <td>DN 15 </td> <td>21.3 </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac"><span class="num">1</span>⁄<span class="den">2</span></span> </td></tr> <tr> <td>DN 20 </td> <td>26.9 </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac"><span class="num">3</span>⁄<span class="den">4</span></span> </td></tr> <tr> <td>DN 25 </td> <td>33.7 </td> <td>1 </td></tr> <tr> <td>DN 32 </td> <td>42.4 </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac">1<span class="sr-only">+</span><span class="num">1</span>⁄<span class="den">4</span></span> </td></tr> <tr> <td>DN 40 </td> <td>48.3 </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac">1<span class="sr-only">+</span><span class="num">1</span>⁄<span class="den">2</span></span> </td></tr> <tr> <td>DN 50 </td> <td>60.3 </td> <td>2 </td></tr> <tr> <td>DN 65 </td> <td>76.1 </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac">2<span class="sr-only">+</span><span class="num">1</span>⁄<span class="den">2</span></span> </td></tr> <tr> <td>DN 80 </td> <td>88.9 </td> <td>3 </td></tr> <tr> <td>DN 100 </td> <td>114.3 </td> <td>4 </td></tr> <tr> <td>DN 125 </td> <td>139.7 </td> <td>- </td></tr> <tr> <td>DN 150 </td> <td>168.3 </td> <td>6 </td></tr> <tr> <td>DN 200 </td> <td>219.1 </td> <td>8 </td></tr> <tr> <td>DN 250 </td> <td>273 </td> <td>10 </td></tr> <tr> <td>DN 300 </td> <td>323.9 </td> <td>12 </td></tr> <tr> <td>DN 350 </td> <td>355.6 </td> <td>14 </td></tr> <tr> <td>DN 400 </td> <td>406.4 </td> <td>16 </td></tr> <tr> <td>DN 450 </td> <td>457 </td> <td>18 </td></tr> <tr> <td>DN 500 </td> <td>508 </td> <td>20 </td></tr> <tr> <td>DN 600 </td> <td>610 </td> <td>24 </td></tr> <tr> <td>DN 700 </td> <td>711 </td> <td>28 </td></tr> <tr> <td>DN 750 </td> <td>762 </td> <td>32 </td></tr> <tr> <td>DN 800 </td> <td>813 </td> <td>34 </td></tr> <tr> <td>DN 900 </td> <td>914 </td> <td>36 </td></tr> <tr> <td>DN 1 000 </td> <td>1016 </td> <td>40 </td></tr> <tr> <td>DN 1 200 </td> <td>1220 </td> <td>48 </td></tr></tbody></table> <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=Preferred_metric_sizes&action=edit&section=12" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Adjustable_shelving" title="Adjustable shelving">Adjustable shelving</a>, used in logistics with items and carriers of various standardised and non-standardised sizes</li> <li><a href="/wiki/Eurocontainer" class="mw-redirect" title="Eurocontainer">Eurocontainer</a>, a system for boxes that can be used for reusable packaging for transport and storage</li> <li><a href="/wiki/Gastronorm" title="Gastronorm">Gastronorm</a>, a standard for professional kitchenware tray and container sizes</li> <li><a href="/wiki/ISO_metric_screw_thread" title="ISO metric screw thread">ISO metric screw thread</a>, the international standard for machine screw threads</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=Preferred_metric_sizes&action=edit&section=13" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-references-wrap mw-references-columns"><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"><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.welmec.org/fileadmin/user_files/publications/6-1.pdf">"Application of Directives 75/106/EEC and 76/211/EEC concerning the marking 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