{"id":2424,"date":"2025-12-16T15:18:33","date_gmt":"2025-12-16T11:48:33","guid":{"rendered":"https:\/\/tfstrading.com\/channel\/"},"modified":"2026-10-12T00:56:00","modified_gmt":"2026-10-11T21:26:00","slug":"channel","status":"publish","type":"page","link":"https:\/\/tfstrading.com\/en\/channel\/","title":{"rendered":"Channel"},"content":{"rendered":"<style>.tfs-a{font-size:15.5px;line-height:2;color:#1d2b36}.tfs-a *{box-sizing:border-box}.tfs-a p{margin:0 0 14px;font-size:15.5px;line-height:2}.tfs-a strong{color:#0b2a4a}.tfs-a .tfs-lead{font-size:16.5px;background:#f5f8fc;border-inline-start:4px solid #f43904;border-radius:12px;padding:18px 22px;margin:0 0 20px}.tfs-a .tfs-facts{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:0 0 22px}.tfs-a .tfs-fact{background:linear-gradient(135deg,#0b2a4a,#14467a);color:#fff;border-radius:12px;padding:16px 10px;text-align:center}.tfs-a .tfs-fact b{display:block;font-size:18px;line-height:1.6;color:#fff}.tfs-a .tfs-fact 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tr:hover td{background:#fff1ec}.tfs-a td:first-child{font-weight:700;color:#0b2a4a}.tfs-a .tfs-small{font-size:13px!important;color:#5b6b7a;margin:6px 0 18px}.tfs-a .tfs-note{background:#fff6f2;border:1px solid #ffd9cc;border-radius:12px;padding:14px 18px;margin:16px 0}.tfs-a .tfs-formula{direction:ltr;text-align:center;font-size:17px!important;font-weight:700;color:#0b2a4a;background:#f5f8fc;border:1px dashed #b9c8da;border-radius:12px;padding:14px;margin:12px 0}.tfs-a .tfs-fig{margin:22px 0;text-align:center}.tfs-a .tfs-fig img{max-width:100%;height:auto;border-radius:12px;box-shadow:0 2px 10px rgba(11,42,74,.06);display:block;margin:0 auto}.tfs-a .tfs-fig figcaption{font-size:13px;color:#5b6b7a;margin-top:8px;line-height:1.8}.tfs-a details{border:1px solid #e3e9f1;border-radius:12px;margin:0 0 10px;background:#fff;overflow:hidden}.tfs-a summary{cursor:pointer;font-weight:700;font-size:15.5px;color:#0b2a4a;padding:14px 18px;list-style-position:inside}.tfs-a details[open] summary{background:#f5f8fc;border-bottom:1px solid #e3e9f1}.tfs-a details p{padding:12px 18px 4px;margin:0 0 10px}.tfs-a .tfs-rel{margin:8px 0 0}.tfs-a .tfs-src{background:#f5f8fc;border-radius:12px;padding:14px 38px}.tfs-a .tfs-src li{font-size:13.5px;line-height:1.9;color:#3c4b59}@media(max-width:700px){.tfs-a .tfs-facts{grid-template-columns:repeat(2,1fr)}.tfs-a .tfs-cards{grid-template-columns:1fr}.tfs-a h2{font-size:19px!important}}.tfs-a[dir=ltr],.tfs-a[dir=ltr] *{font-family:\"Segoe UI\",Roboto,\"Helvetica Neue\",Arial,sans-serif!important}.tfs-a[dir=ltr],.tfs-a[dir=ltr] h2,.tfs-a[dir=ltr] h3{text-align:left}.tfs-a[dir=ltr] th{white-space:normal}.tfs-a[dir=ltr] p,.tfs-a[dir=ltr] li{line-height:1.8}.tfs-a td:first-child{white-space:nowrap}.tfs-a .tfs-pcalc{background:#0b2a4a;color:#fff;border-radius:12px;padding:22px;margin:18px 0 22px}.tfs-a .tfs-pc-title{display:block;font-size:17px;font-weight:800;color:#fff;margin-bottom:14px}.tfs-a .tfs-pc-fields{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:12px}.tfs-a .tfs-pc-fields label{display:flex;flex-direction:column;gap:4px;font-size:13px;color:#cfdcea;margin:0;min-width:0}.tfs-a .tfs-pc-fields input,.tfs-a .tfs-pc-fields select{font:inherit;font-size:16px;direction:ltr;text-align:center;border:0;border-radius:8px;height:40px;padding:0 10px;background:#fff;color:#1d2b36;width:100%;margin:0;box-shadow:none}.tfs-a .tfs-pc-result{display:grid;grid-template-columns:1fr 1fr;gap:12px;text-align:center;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);border-radius:12px;padding:16px;margin-top:14px}.tfs-a .tfs-pc-result b{display:block;font-size:24px;font-weight:800;line-height:1.4;color:#fff}.tfs-a .tfs-pc-result span{font-size:13px;color:#cfdcea}.tfs-a .tfs-pcalc .tfs-pc-note{font-size:12.5px!important;color:#cfdcea;margin:12px 0 0;line-height:1.8}<\/style>\n<div class=\"tfs-a\" dir=\"ltr\">\n<p class=\"tfs-lead\">A <strong>steel channel<\/strong> is a section with a U-shaped cross-section, made up of a web and two flanges on the same side of it. It is widely used for built-up columns, roof purlins, chassis and steel frames. This guide covers channel types, the parts of the section, the UNP channel size and weight chart, steel grades and applications.<\/p>\n<div class=\"tfs-facts\">\n<div class=\"tfs-fact\"><b>6 and 12 m<\/b><span>Common length<\/span><\/div>\n<div class=\"tfs-fact\"><b>50 to 300 mm<\/b><span>UNP section depth<\/span><\/div>\n<div class=\"tfs-fact\"><b>S235JR (St37)<\/b><span>Common steel<\/span><\/div>\n<div class=\"tfs-fact\"><b>EN 10365<\/b><span>Dimension standard<\/span><\/div>\n<\/div>\n<nav class=\"tfs-toc\"><b>On this page<\/b><a href=\"#what\">What is a steel channel and what are its parts?<\/a><a href=\"#types\">Types of steel channel<\/a><a href=\"#compare\">Hot-rolled versus press-formed channel<\/a><a href=\"#size\">Designation and section dimensions<\/a><a href=\"#weight\">UNP channel size and weight chart<\/a><a href=\"#steel\">Steel grades for channels<\/a><a href=\"#production\">How channels are made<\/a><a href=\"#uses\">Applications of steel channels<\/a><a href=\"#storage\">Storage notes<\/a><a href=\"#faq\">Frequently asked questions about steel channels<\/a><a href=\"#related\">Related steel sections<\/a><a href=\"#sources\">References and standards<\/a><\/nav>\n<h2 id=\"what\">What is a steel channel and what are its parts?<\/h2>\n<p>A channel has three parts: the <strong>web<\/strong>, the vertical plate of the section, and two <strong>flanges<\/strong> at the top and bottom, both on the same side of the web. This gives a section shaped like the letter U or C. The flat back of a channel provides a convenient surface for connecting to other members, walls or plates, which is what sets it apart from an I-beam.<\/p>\n<p>Like an I-beam, a channel resists bending about its strong axis well, but because the section has only one axis of symmetry, its behaviour in torsion is different.<\/p>\n<h2 id=\"types\">Types of steel channel<\/h2>\n<div class=\"tfs-cards\">\n<div class=\"tfs-card\"><b>Tapered-flange channel (UNP)<\/b><span>The inner faces of the flanges are tapered, so flange thickness increases toward the web. It is the most common hot-rolled channel and is also written UPN.<\/span><\/div>\n<div class=\"tfs-card\"><b>Parallel-flange channel (UPE)<\/b><span>The inner and outer flange faces are parallel and flange thickness is constant. Bolting to the flange is easier, and it is usually lighter than a UNP of the same depth.<\/span><\/div>\n<div class=\"tfs-card\"><b>Hot-rolled channel<\/b><span>Produced by hot rolling a steel billet, with dimensions according to the standard table. Used for structural members.<\/span><\/div>\n<div class=\"tfs-card\"><b>Press-formed channel<\/b><span>Made by cold bending steel strip. The thickness is uniform across the section, the corners are rounded, and it can be made to custom sizes.<\/span><\/div>\n<div class=\"tfs-card\"><b>Galvanized channel<\/b><span>Protected by a zinc coating and used in outdoor structures, building services and cable tray supports.<\/span><\/div>\n<div class=\"tfs-card\"><b>Double channel<\/b><span>Two channels joined back to back or toe to toe to form a symmetrical section for columns and beams.<\/span><\/div>\n<\/div>\n<h2 id=\"compare\">Hot-rolled versus press-formed channel<\/h2>\n<div class=\"tfs-tw\">\n<table>\n<thead>\n<tr>\n<th>Property<\/th>\n<th>Hot-rolled channel<\/th>\n<th>Press-formed channel (bent from sheet)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Process<\/td>\n<td>Hot rolling of a steel billet<\/td>\n<td>Slitting sheet and cold bending<\/td>\n<\/tr>\n<tr>\n<td>Web and flange thickness<\/td>\n<td>Different; flanges thicker than the web<\/td>\n<td>Uniform, equal to the sheet thickness<\/td>\n<\/tr>\n<tr>\n<td>Outer corners<\/td>\n<td>Sharp, square<\/td>\n<td>Rounded<\/td>\n<\/tr>\n<tr>\n<td>Dimensions<\/td>\n<td>According to the standard table<\/td>\n<td>Can be made to custom sizes<\/td>\n<\/tr>\n<tr>\n<td>Typical use<\/td>\n<td>Structural, load-bearing members<\/td>\n<td>Light fabrication, frames, tracks and trims<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2 id=\"size\">Designation and section dimensions<\/h2>\n<p>The size number of a channel is the nominal depth of the section in millimetres. For example, UNP 140 has a depth of 140 mm.<\/p>\n<figure class=\"tfs-fig\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2962\" src=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-channel-section.webp\" alt=\"Parts of UNP and UPE channel sections\" width=\"1200\" height=\"600\" loading=\"lazy\" srcset=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-channel-section.webp 1200w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-channel-section-300x150.webp 300w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-channel-section-1024x512.webp 1024w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-channel-section-768x384.webp 768w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-channel-section-64x32.webp 64w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-channel-section-108x54.webp 108w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-channel-section-118x59.webp 118w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-channel-section-140x70.webp 140w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-channel-section-276x138.webp 276w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Tapered-flange (UNP) and parallel-flange (UPE) channels compared, with dimension symbols: depth (h), flange width (b), web thickness (tw) and flange thickness (tf).<\/figcaption><\/figure>\n<h2 id=\"weight\">UNP channel size and weight chart<\/h2>\n<div class=\"tfs-tw\">\n<table>\n<thead>\n<tr>\n<th>Size<\/th>\n<th>Depth h (mm)<\/th>\n<th>Flange width b (mm)<\/th>\n<th>Web tw (mm)<\/th>\n<th>Flange tf (mm)<\/th>\n<th>Mass per metre (kg)<\/th>\n<th>Mass of a 6 m length (kg)<\/th>\n<th>Mass of a 12 m length (kg)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>UNP 50<\/td>\n<td>50<\/td>\n<td>38<\/td>\n<td>5.0<\/td>\n<td>7.0<\/td>\n<td>5.59<\/td>\n<td>33.5<\/td>\n<td>67.1<\/td>\n<\/tr>\n<tr>\n<td>UNP 65<\/td>\n<td>65<\/td>\n<td>42<\/td>\n<td>5.5<\/td>\n<td>7.5<\/td>\n<td>7.09<\/td>\n<td>42.5<\/td>\n<td>85.1<\/td>\n<\/tr>\n<tr>\n<td>UNP 80<\/td>\n<td>80<\/td>\n<td>45<\/td>\n<td>6.0<\/td>\n<td>8.0<\/td>\n<td>8.64<\/td>\n<td>51.8<\/td>\n<td>103.7<\/td>\n<\/tr>\n<tr>\n<td>UNP 100<\/td>\n<td>100<\/td>\n<td>50<\/td>\n<td>6.0<\/td>\n<td>8.5<\/td>\n<td>10.6<\/td>\n<td>63.6<\/td>\n<td>127.2<\/td>\n<\/tr>\n<tr>\n<td>UNP 120<\/td>\n<td>120<\/td>\n<td>55<\/td>\n<td>7.0<\/td>\n<td>9.0<\/td>\n<td>13.4<\/td>\n<td>80.4<\/td>\n<td>160.8<\/td>\n<\/tr>\n<tr>\n<td>UNP 140<\/td>\n<td>140<\/td>\n<td>60<\/td>\n<td>7.0<\/td>\n<td>10.0<\/td>\n<td>16.0<\/td>\n<td>96.0<\/td>\n<td>192.0<\/td>\n<\/tr>\n<tr>\n<td>UNP 160<\/td>\n<td>160<\/td>\n<td>65<\/td>\n<td>7.5<\/td>\n<td>10.5<\/td>\n<td>18.8<\/td>\n<td>112.8<\/td>\n<td>225.6<\/td>\n<\/tr>\n<tr>\n<td>UNP 180<\/td>\n<td>180<\/td>\n<td>70<\/td>\n<td>8.0<\/td>\n<td>11.0<\/td>\n<td>22.0<\/td>\n<td>132.0<\/td>\n<td>264.0<\/td>\n<\/tr>\n<tr>\n<td>UNP 200<\/td>\n<td>200<\/td>\n<td>75<\/td>\n<td>8.5<\/td>\n<td>11.5<\/td>\n<td>25.3<\/td>\n<td>151.8<\/td>\n<td>303.6<\/td>\n<\/tr>\n<tr>\n<td>UNP 220<\/td>\n<td>220<\/td>\n<td>80<\/td>\n<td>9.0<\/td>\n<td>12.5<\/td>\n<td>29.4<\/td>\n<td>176.4<\/td>\n<td>352.8<\/td>\n<\/tr>\n<tr>\n<td>UNP 240<\/td>\n<td>240<\/td>\n<td>85<\/td>\n<td>9.5<\/td>\n<td>13.0<\/td>\n<td>33.2<\/td>\n<td>199.2<\/td>\n<td>398.4<\/td>\n<\/tr>\n<tr>\n<td>UNP 260<\/td>\n<td>260<\/td>\n<td>90<\/td>\n<td>10.0<\/td>\n<td>14.0<\/td>\n<td>37.9<\/td>\n<td>227.4<\/td>\n<td>454.8<\/td>\n<\/tr>\n<tr>\n<td>UNP 280<\/td>\n<td>280<\/td>\n<td>95<\/td>\n<td>10.0<\/td>\n<td>15.0<\/td>\n<td>41.8<\/td>\n<td>250.8<\/td>\n<td>501.6<\/td>\n<\/tr>\n<tr>\n<td>UNP 300<\/td>\n<td>300<\/td>\n<td>100<\/td>\n<td>10.0<\/td>\n<td>16.0<\/td>\n<td>46.2<\/td>\n<td>277.2<\/td>\n<td>554.4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"tfs-small\">Nominal dimensions and masses according to EN 10365. Actual mass may vary within the tolerance permitted by the standard.<\/p>\n<div class=\"tfs-pcalc\" data-cfg=\"{&quot;type&quot;: &quot;table&quot;, &quot;len&quot;: 6, &quot;loc&quot;: &quot;en-US&quot;, &quot;labels&quot;: {&quot;d&quot;: &quot;Diameter (mm)&quot;, &quot;L&quot;: &quot;Length (m)&quot;, &quot;t&quot;: &quot;Thickness (mm)&quot;, &quot;B&quot;: &quot;Width (m)&quot;, &quot;OD&quot;: &quot;Outside diameter (mm)&quot;, &quot;a&quot;: &quot;Side a (mm)&quot;, &quot;b&quot;: &quot;Side b (mm)&quot;, &quot;S&quot;: &quot;Size&quot;}, &quot;sizes&quot;: [[&quot;UNP 50&quot;, 5.59], [&quot;UNP 65&quot;, 7.09], [&quot;UNP 80&quot;, 8.64], [&quot;UNP 100&quot;, 10.6], [&quot;UNP 120&quot;, 13.4], [&quot;UNP 140&quot;, 16.0], [&quot;UNP 160&quot;, 18.8], [&quot;UNP 180&quot;, 22.0], [&quot;UNP 200&quot;, 25.3], [&quot;UNP 220&quot;, 29.4], [&quot;UNP 240&quot;, 33.2], [&quot;UNP 260&quot;, 37.9], [&quot;UNP 280&quot;, 41.8], [&quot;UNP 300&quot;, 46.2]]}\"><b class=\"tfs-pc-title\">Channel weight calculator<\/b><\/p>\n<div class=\"tfs-pc-fields\"><\/div>\n<div class=\"tfs-pc-result\">\n<div><b class=\"tfs-pc-perm\">\u2013<\/b><span>Mass per metre (kg)<\/span><\/div>\n<div><b class=\"tfs-pc-total\">\u2013<\/b><span>Total mass (kg)<\/span><\/div>\n<\/div>\n<p class=\"tfs-pc-note\">Theoretical mass based on a density of 7850 kg\/m\u00b3; actual mass may differ slightly within the tolerance of the standard.<\/p>\n<\/div>\n<h3>Calculating channel weight<\/h3>\n<p>The mass of a length of channel is the mass per metre (from the table) multiplied by the length. For example, UNP 120 at 13.4 kg per metre weighs about 80.4 kg for a 6 m length and about 160.8 kg for a 12 m length.<\/p>\n<h2 id=\"steel\">Steel grades for channels<\/h2>\n<p>Structural channels are normally made from non-alloy structural steels. The common grades according to EN 10025-2 are:<\/p>\n<div class=\"tfs-tw\">\n<table>\n<thead>\n<tr>\n<th>Grade (EN 10025-2)<\/th>\n<th>Former DIN name<\/th>\n<th>Min. yield strength (MPa)<\/th>\n<th>Tensile strength (MPa)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>S235JR<\/td>\n<td>St37-2<\/td>\n<td>235<\/td>\n<td>360 \u2013 510<\/td>\n<\/tr>\n<tr>\n<td>S275JR<\/td>\n<td>St44-2<\/td>\n<td>275<\/td>\n<td>410 \u2013 560<\/td>\n<\/tr>\n<tr>\n<td>S355JR<\/td>\n<td>St52-3<\/td>\n<td>355<\/td>\n<td>470 \u2013 630<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"tfs-small\">Values apply to nominal thicknesses up to 16 mm.<\/p>\n<h2 id=\"production\">How channels are made<\/h2>\n<p>Hot-rolled channels are produced by hot rolling. A steel billet is reheated to rolling temperature and passed repeatedly through rolling stands, gradually taking the U shape. The product then cools on a cooling bed, is straightened and is cut to standard length. Press-formed channels are made by slitting sheet and bending it cold with a press brake or rolls.<\/p>\n<h2 id=\"uses\">Applications of steel channels<\/h2>\n<ul>\n<li><strong>Built-up columns and beams:<\/strong> two channels joined by batten plates or plates form a double column or beam.<\/li>\n<li><strong>Purlins and roof members:<\/strong> roof purlins of industrial buildings and truss members.<\/li>\n<li><strong>Stairs:<\/strong> the stringers of steel staircases.<\/li>\n<li><strong>Lintels and frames:<\/strong> beams over openings and frames for large doors.<\/li>\n<li><strong>Bracing:<\/strong> bracing members in steel frames.<\/li>\n<li><strong>Chassis and machinery:<\/strong> truck and trailer chassis, equipment structures and conveyors.<\/li>\n<\/ul>\n<p class=\"tfs-note\"><strong>Design note:<\/strong> the shear centre of a channel lies outside the section, behind the web. If the load does not pass through this point, the member twists as well as bends. A single channel therefore needs adequate lateral restraint or should be used as a double section.<\/p>\n<h2 id=\"storage\">Storage notes<\/h2>\n<ul>\n<li>Stack lengths on level supports, clear of the ground, to prevent bending and contact with moisture.<\/li>\n<li>Preferably stack channels so that water cannot collect inside the U shape.<\/li>\n<li>Before use, check straightness, section dimensions and the absence of twist.<\/li>\n<\/ul>\n<h2 id=\"faq\">Frequently asked questions about steel channels<\/h2>\n<details>\n<summary>What is the difference between a channel and an I-beam?<\/summary>\n<p>In an I-beam the flanges extend on both sides of the web, giving an I shape, while in a channel both flanges are on one side of the web, giving a U shape. A channel has a flat back for connections.<\/p>\n<\/details>\n<details>\n<summary>What does the size number of a channel mean?<\/summary>\n<p>It is the nominal depth of the section. For example, UNP 140 has a depth of 140 mm.<\/p>\n<\/details>\n<details>\n<summary>What is the difference between UNP and UPE channels?<\/summary>\n<p>In a UNP the inner flange faces are tapered, while in a UPE the flanges are parallel with constant thickness. UPE is usually lighter and easier to bolt through the flange.<\/p>\n<\/details>\n<details>\n<summary>How is the weight of a channel calculated?<\/summary>\n<p>Read the mass per metre from the standard table and multiply by the length. For example, UNP 100 at 10.6 kg per metre weighs about 63.6 kg for a 6 m length.<\/p>\n<\/details>\n<details>\n<summary>What is a double channel?<\/summary>\n<p>Two channels joined back to back or toe to toe to obtain a symmetrical, stronger section for a column or beam.<\/p>\n<\/details>\n<h2 id=\"related\">Related steel sections<\/h2>\n<p class=\"tfs-rel\"><a href=\"https:\/\/tfstrading.com\/en\/rebar\/\">Rebar<\/a><a href=\"https:\/\/tfstrading.com\/en\/i-beam\/\">I-beam<\/a><a href=\"https:\/\/tfstrading.com\/en\/sheet\/\">Sheet<\/a><a href=\"https:\/\/tfstrading.com\/en\/profile\/\">Profile<\/a><a href=\"https:\/\/tfstrading.com\/en\/pipe\/\">Pipe<\/a><a href=\"https:\/\/tfstrading.com\/en\/angle-bar\/\">Angle bar<\/a><\/p>\n<h2 id=\"sources\">References and standards<\/h2>\n<ul class=\"tfs-src\">\n<li>EN 10365: Hot rolled steel channels, I and H sections, dimensions and masses<\/li>\n<li>DIN 1026-1 and DIN 1026-2: Dimensions of tapered-flange (UPN) and parallel-flange (UPE) channels<\/li>\n<li>EN 10279: Hot rolled steel channels, tolerances on shape, dimensions and mass<\/li>\n<li>EN 10025-2: Hot rolled products of non-alloy structural steels, technical delivery conditions<\/li>\n<li>Iranian National Building Regulations, Part 10: Design and construction of steel buildings<\/li>\n<\/ul>\n<\/div>\n<p><script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the difference between a channel and an I-beam?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"In an I-beam the flanges extend on both sides of the web, giving an I shape, while in a channel both flanges are on one side of the web, giving a U shape. 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It is widely used for built-up columns, roof purlins, chassis and steel frames. This guide covers channel types, the parts of the section, the UNP channel size and weight chart, steel&#8230;<\/p>\n","protected":false},"author":2,"featured_media":2812,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-2424","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/tfstrading.com\/en\/wp-json\/wp\/v2\/pages\/2424","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tfstrading.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/tfstrading.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/tfstrading.com\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/tfstrading.com\/en\/wp-json\/wp\/v2\/comments?post=2424"}],"version-history":[{"count":3,"href":"https:\/\/tfstrading.com\/en\/wp-json\/wp\/v2\/pages\/2424\/revisions"}],"predecessor-version":[{"id":3059,"href":"https:\/\/tfstrading.com\/en\/wp-json\/wp\/v2\/pages\/2424\/revisions\/3059"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tfstrading.com\/en\/wp-json\/wp\/v2\/media\/2812"}],"wp:attachment":[{"href":"https:\/\/tfstrading.com\/en\/wp-json\/wp\/v2\/media?parent=2424"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}