{"id":2450,"date":"2025-11-29T02:01:00","date_gmt":"2025-11-28T22:31:00","guid":{"rendered":"https:\/\/tfstrading.com\/rebar\/"},"modified":"2026-10-28T12:22:21","modified_gmt":"2026-10-28T08:52:21","slug":"rebar","status":"publish","type":"page","link":"https:\/\/tfstrading.com\/en\/rebar\/","title":{"rendered":"Rebar"},"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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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}.tfs-a .tfs-duo{display:grid;grid-template-columns:1fr 1fr;gap:12px}.tfs-a .tfs-duo img{width:100%;height:100%;aspect-ratio:3\/2;object-fit:cover}.tfs-a .tfs-duo figcaption{grid-column:1\/-1}@media(max-width:560px){.tfs-a .tfs-duo{grid-template-columns:1fr}}<\/style>\n<div class=\"tfs-a\" dir=\"ltr\">\n<p class=\"tfs-lead\"><strong>Rebar<\/strong> (reinforcing bar) is a solid round steel bar placed inside concrete to carry the tensile forces that concrete alone cannot resist. This guide covers rebar types, standard grades, rib patterns, the rebar weight chart, and practical notes on use and storage.<\/p>\n<div class=\"tfs-facts\">\n<div class=\"tfs-fact\"><b>7850 kg\/m\u00b3<\/b><span>Steel density<\/span><\/div>\n<div class=\"tfs-fact\"><b>12 m<\/b><span>Common bar length<\/span><\/div>\n<div class=\"tfs-fact\"><b>8 to 40 mm<\/b><span>Common diameters<\/span><\/div>\n<div class=\"tfs-fact\"><b>S240 to S500<\/b><span>Standard grades<\/span><\/div>\n<\/div>\n<nav class=\"tfs-toc\"><b>On this page<\/b><a href=\"#what\">What is rebar?<\/a><a href=\"#types\">Types of rebar<\/a><a href=\"#grades\">Rebar grades and mechanical properties<\/a><a href=\"#weight\">Rebar weight chart<\/a><a href=\"#production\">How rebar is made<\/a><a href=\"#uses\">Applications of rebar<\/a><a href=\"#storage\">Storage and handling<\/a><a href=\"#faq\">Frequently asked questions about rebar<\/a><a href=\"#related\">Related steel sections<\/a><a href=\"#sources\">References and standards<\/a><\/nav>\n<h2 id=\"what\">What is rebar?<\/h2>\n<p>Rebar is a steel product made by hot rolling steel billets and supplied as straight bars or coils. Concrete is strong in compression, but its tensile strength is only a small fraction of its compressive strength. Placing rebar in the tension zone of a concrete member lets the steel carry tension; together the two materials form reinforced concrete.<\/p>\n<p>Two properties make this partnership work. First, steel and concrete have similar coefficients of thermal expansion, so temperature changes do not create significant internal stress between them. Second, the alkaline environment of concrete forms a protective layer on the steel surface that slows corrosion.<\/p>\n<figure class=\"tfs-fig\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3099\" src=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-1.webp\" alt=\"Ribbed rebar\" width=\"1200\" height=\"800\" loading=\"lazy\" srcset=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-1.webp 1200w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-1-300x200.webp 300w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-1-1024x683.webp 1024w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-1-768x512.webp 768w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-1-64x43.webp 64w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-1-108x72.webp 108w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-1-118x79.webp 118w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-1-105x70.webp 105w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-1-207x138.webp 207w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Ribbed rebar: the surface ribs improve the bond between steel and concrete.<\/figcaption><\/figure>\n<h2 id=\"types\">Types of rebar<\/h2>\n<div class=\"tfs-cards\">\n<div class=\"tfs-card\"><b>Plain bar<\/b><span>A smooth bar with no ribs, produced in grade S240. It is highly ductile and easy to bend, and is mostly used for spirals, industrial work and fabricated parts.<\/span><\/div>\n<div class=\"tfs-card\"><b>Ribbed (deformed) bar<\/b><span>Raised ribs on the surface create a mechanical interlock with concrete. The main reinforcement of concrete structures is of this type.<\/span><\/div>\n<div class=\"tfs-card\"><b>Coiled bar<\/b><span>Small diameters are wound into coils, then straightened and cut before use. Coils are used for stirrups, mesh and wire products.<\/span><\/div>\n<div class=\"tfs-card\"><b>Quenched and tempered bar<\/b><span>After hot rolling, the bar surface is rapidly water-cooled and the heat of the core tempers the outer layer, giving a hard surface and a ductile core.<\/span><\/div>\n<div class=\"tfs-card\"><b>Micro-alloyed bar<\/b><span>Strength is achieved by adding micro-alloying elements to the melt, so properties are more uniform across the section.<\/span><\/div>\n<div class=\"tfs-card\"><b>Coated and stainless bar<\/b><span>For corrosive environments, galvanized, epoxy-coated or stainless steel bars are used.<\/span><\/div>\n<\/div>\n<figure class=\"tfs-fig\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3101\" src=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-2.webp\" alt=\"Rebar coils\" width=\"1200\" height=\"800\" loading=\"lazy\" srcset=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-2.webp 1200w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-2-300x200.webp 300w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-2-1024x683.webp 1024w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-2-768x512.webp 768w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-2-64x43.webp 64w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-2-108x72.webp 108w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-2-118x79.webp 118w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-2-105x70.webp 105w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-2-207x138.webp 207w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Coiled rebar: small diameters are supplied in coils.<\/figcaption><\/figure>\n<h2 id=\"grades\">Rebar grades and mechanical properties<\/h2>\n<p>Iranian National Standard INSO 3132 classifies rebar by minimum yield strength. The number in each grade is the minimum yield strength in megapascals. The names A1 to A4 are an older designation that is still common in everyday technical use.<\/p>\n<div class=\"tfs-tw\">\n<table>\n<thead>\n<tr>\n<th>Grade<\/th>\n<th>Common name<\/th>\n<th>Surface<\/th>\n<th>Min. yield strength (MPa)<\/th>\n<th>Min. tensile strength (MPa)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>S240<\/td>\n<td>A1<\/td>\n<td>Plain (no ribs)<\/td>\n<td>240<\/td>\n<td>360<\/td>\n<\/tr>\n<tr>\n<td>S340<\/td>\n<td>A2<\/td>\n<td>Spiral (uniform) ribs<\/td>\n<td>340<\/td>\n<td>500<\/td>\n<\/tr>\n<tr>\n<td>S400<\/td>\n<td>A3<\/td>\n<td>Herringbone ribs<\/td>\n<td>400<\/td>\n<td>600<\/td>\n<\/tr>\n<tr>\n<td>S500<\/td>\n<td>A4<\/td>\n<td>Composite ribs<\/td>\n<td>500<\/td>\n<td>650<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"tfs-small\">Values are the minimums required by the standard. Recent editions of the standard also define further grades such as S350, S420 and S520.<\/p>\n<p>As the grade increases, strength rises and ductility falls. For this reason, the choice of grade in earthquake-resisting members is governed by the design code and must follow the structural drawings.<\/p>\n<h3>Rib pattern of each grade<\/h3>\n<figure class=\"tfs-fig\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2900\" src=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-rebar-ribs.webp\" alt=\"Rib patterns of S240, S340, S400 and S500 rebar\" width=\"1200\" height=\"600\" loading=\"lazy\" srcset=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-rebar-ribs.webp 1200w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-rebar-ribs-300x150.webp 300w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-rebar-ribs-1024x512.webp 1024w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-rebar-ribs-768x384.webp 768w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-rebar-ribs-64x32.webp 64w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-rebar-ribs-108x54.webp 108w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-rebar-ribs-118x59.webp 118w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-rebar-ribs-140x70.webp 140w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-rebar-ribs-276x138.webp 276w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Schematic view of the bar surface: plain (S240), uniform spiral ribs (S340), herringbone ribs (S400) and composite ribs (S500).<\/figcaption><\/figure>\n<ul>\n<li><strong>S240:<\/strong> completely smooth surface.<\/li>\n<li><strong>S340:<\/strong> transverse ribs all inclined the same way, forming a spiral around the bar.<\/li>\n<li><strong>S400:<\/strong> ribs on the two sides are inclined in opposite directions, forming a herringbone pattern.<\/li>\n<li><strong>S500:<\/strong> a combination of ribs at different angles, known as a composite pattern.<\/li>\n<\/ul>\n<figure class=\"tfs-fig\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3103\" src=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-3.webp\" alt=\"Close-up of rebar ribs\" width=\"1200\" height=\"800\" loading=\"lazy\" srcset=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-3.webp 1200w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-3-300x200.webp 300w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-3-1024x683.webp 1024w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-3-768x512.webp 768w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-3-64x43.webp 64w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-3-108x72.webp 108w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-3-118x79.webp 118w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-3-105x70.webp 105w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-3-207x138.webp 207w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Close-up of the ribs on the bar surface.<\/figcaption><\/figure>\n<h2 id=\"weight\">Rebar weight chart<\/h2>\n<p>The nominal mass of a bar depends on its diameter and is calculated from the density of steel. The table below lists common diameters:<\/p>\n<div class=\"tfs-tw\">\n<table>\n<thead>\n<tr>\n<th>Nominal diameter (mm)<\/th>\n<th>Cross-section (mm\u00b2)<\/th>\n<th>Mass per metre (kg)<\/th>\n<th>Mass of a 12 m bar (kg)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>8<\/td>\n<td>50.3<\/td>\n<td>0.395<\/td>\n<td>4.74<\/td>\n<\/tr>\n<tr>\n<td>10<\/td>\n<td>78.5<\/td>\n<td>0.617<\/td>\n<td>7.40<\/td>\n<\/tr>\n<tr>\n<td>12<\/td>\n<td>113<\/td>\n<td>0.888<\/td>\n<td>10.66<\/td>\n<\/tr>\n<tr>\n<td>14<\/td>\n<td>154<\/td>\n<td>1.21<\/td>\n<td>14.50<\/td>\n<\/tr>\n<tr>\n<td>16<\/td>\n<td>201<\/td>\n<td>1.58<\/td>\n<td>18.94<\/td>\n<\/tr>\n<tr>\n<td>18<\/td>\n<td>254<\/td>\n<td>2.00<\/td>\n<td>23.97<\/td>\n<\/tr>\n<tr>\n<td>20<\/td>\n<td>314<\/td>\n<td>2.47<\/td>\n<td>29.59<\/td>\n<\/tr>\n<tr>\n<td>22<\/td>\n<td>380<\/td>\n<td>2.98<\/td>\n<td>35.81<\/td>\n<\/tr>\n<tr>\n<td>25<\/td>\n<td>491<\/td>\n<td>3.85<\/td>\n<td>46.24<\/td>\n<\/tr>\n<tr>\n<td>28<\/td>\n<td>616<\/td>\n<td>4.83<\/td>\n<td>58.00<\/td>\n<\/tr>\n<tr>\n<td>32<\/td>\n<td>804<\/td>\n<td>6.31<\/td>\n<td>75.76<\/td>\n<\/tr>\n<tr>\n<td>36<\/td>\n<td>1018<\/td>\n<td>7.99<\/td>\n<td>95.88<\/td>\n<\/tr>\n<tr>\n<td>40<\/td>\n<td>1257<\/td>\n<td>9.86<\/td>\n<td>118.38<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"tfs-small\">The actual mass of a bar may differ from the nominal value within the tolerance permitted by the standard.<\/p>\n<div class=\"tfs-pcalc\" data-cfg=\"{&quot;type&quot;: &quot;rebar&quot;, &quot;len&quot;: 12, &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;}}\"><b class=\"tfs-pc-title\">Rebar 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>Rebar weight formula<\/h3>\n<p>With the bar diameter (d) in millimetres, the mass per metre in kilograms is:<\/p>\n<p class=\"tfs-formula\">W = d\u00b2 \u00f7 162<\/p>\n<p>For example, a 16 mm bar weighs 16 \u00d7 16 \u00f7 162, or about 1.58 kg per metre. The formula is a simplified form of the circular cross-section area multiplied by the density of steel.<\/p>\n<figure class=\"tfs-fig\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3107\" src=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-5.webp\" alt=\"Bundle of ribbed rebar\" width=\"1200\" height=\"745\" loading=\"lazy\" srcset=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-5.webp 1200w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-5-300x186.webp 300w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-5-1024x636.webp 1024w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-5-768x477.webp 768w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-5-64x40.webp 64w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-5-108x67.webp 108w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-5-118x73.webp 118w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-5-113x70.webp 113w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-5-222x138.webp 222w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>The ends of ribbed bars in a bundle.<\/figcaption><\/figure>\n<h2 id=\"production\">How rebar is made<\/h2>\n<p>The raw material is a steel billet. The billet is heated in a furnace to roughly 1100 to 1200 \u00b0C and passed through a series of rolling stands that reduce its cross-section. In the final stand, grooved rolls form the ribs and the identification marks on the surface. The bar then cools on a cooling bed and is cut to standard length and bundled.<\/p>\n<p class=\"tfs-note\"><strong>Identification marks:<\/strong> standard ribbed bars carry rolled-in marks that identify the producer and the grade, which makes the product traceable.<\/p>\n<figure class=\"tfs-fig\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3151\" src=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-6.webp\" alt=\"Ribbed rebar lengths\" width=\"1200\" height=\"797\" loading=\"lazy\" srcset=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-6.webp 1200w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-6-300x199.webp 300w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-6-1024x680.webp 1024w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-6-768x510.webp 768w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-6-64x43.webp 64w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-6-108x72.webp 108w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-6-118x78.webp 118w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-6-105x70.webp 105w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-6-208x138.webp 208w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Bars after rolling and cutting to standard length.<\/figcaption><\/figure>\n<h2 id=\"uses\">Applications of rebar<\/h2>\n<ul>\n<li><strong>Foundations:<\/strong> top and bottom rebar mats carry the tension caused by bending.<\/li>\n<li><strong>Columns and shear walls:<\/strong> longitudinal bars carry axial load and bending, while ties restrain them against buckling.<\/li>\n<li><strong>Beams and slabs:<\/strong> longitudinal bars in the tension zone and stirrups to resist shear.<\/li>\n<li><strong>Infrastructure:<\/strong> bridges, tunnels, dams, tanks and quay walls.<\/li>\n<li><strong>Industry:<\/strong> plain bars are used for parts, anchor bolts and fabricated steel items.<\/li>\n<\/ul>\n<figure class=\"tfs-fig\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3155\" src=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-8.webp\" alt=\"Surface of stacked bars\" width=\"1200\" height=\"900\" loading=\"lazy\" srcset=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-8.webp 1200w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-8-300x225.webp 300w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-8-1024x768.webp 1024w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-8-768x576.webp 768w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-8-64x48.webp 64w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-8-108x81.webp 108w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-8-118x89.webp 118w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-8-93x70.webp 93w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-8-184x138.webp 184w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Bars of one diameter side by side; the ribs are uniform along the length.<\/figcaption><\/figure>\n<h2 id=\"storage\">Storage and handling<\/h2>\n<ul>\n<li>Store bars on supports, clear of the ground, away from soil and standing water.<\/li>\n<li>A thin, tightly adhering layer of rust normally does not reduce bond, but flaking rust, oil, grease and mud must be removed before use.<\/li>\n<li>Keep different grades and diameters apart to avoid mix-ups on site.<\/li>\n<li>Bend bars cold and to the permitted bend diameter; heating a bar to bend it changes its properties.<\/li>\n<\/ul>\n<figure class=\"tfs-fig\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3153\" src=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-7.webp\" alt=\"Bundles of rebar\" width=\"1200\" height=\"771\" loading=\"lazy\" srcset=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-7.webp 1200w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-7-300x193.webp 300w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-7-1024x658.webp 1024w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-7-768x493.webp 768w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-7-64x41.webp 64w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-7-108x69.webp 108w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-7-118x76.webp 118w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-7-109x70.webp 109w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-7-215x138.webp 215w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Rebar ready for fixing.<\/figcaption><\/figure>\n<figure class=\"tfs-fig\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3105\" src=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-4.webp\" alt=\"Rebar in different diameters\" width=\"1200\" height=\"800\" loading=\"lazy\" srcset=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-4.webp 1200w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-4-300x200.webp 300w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-4-1024x683.webp 1024w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-4-768x512.webp 768w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-4-64x43.webp 64w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-4-108x72.webp 108w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-4-118x79.webp 118w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-4-105x70.webp 105w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-rebar-4-207x138.webp 207w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Ribbed rebar in a range of diameters, from thin to thick.<\/figcaption><\/figure>\n<h2 id=\"faq\">Frequently asked questions about rebar<\/h2>\n<details>\n<summary>What is the difference between A2 and A3 rebar?<\/summary>\n<p>A2 rebar (grade S340) has a minimum yield strength of 340 MPa and spiral ribs, while A3 rebar (grade S400) has a minimum yield strength of 400 MPa and herringbone ribs. A2 is more ductile; A3 is stronger.<\/p>\n<\/details>\n<details>\n<summary>How is rebar weight calculated?<\/summary>\n<p>Square the diameter in millimetres and divide by 162 to get the mass per metre in kilograms. Multiply by 12 for the nominal mass of a 12 m bar.<\/p>\n<\/details>\n<details>\n<summary>Why are ribbed bars used in concrete?<\/summary>\n<p>The ribs lock the bar mechanically into the concrete and prevent slip, so force is transferred effectively between the two materials.<\/p>\n<\/details>\n<details>\n<summary>Can rusty rebar be used?<\/summary>\n<p>A thin, adherent surface rust is usually not a problem. If the rust is flaking or has reduced the cross-section, the bar should be cleaned and checked for diameter and mass.<\/p>\n<\/details>\n<details>\n<summary>What is the standard length of a rebar?<\/summary>\n<p>The common bar length is 12 m. Small diameters are also produced in coils.<\/p>\n<\/details>\n<h2 id=\"related\">Related steel sections<\/h2>\n<p class=\"tfs-rel\"><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><a href=\"https:\/\/tfstrading.com\/en\/channel\/\">Channel<\/a><\/p>\n<h2 id=\"sources\">References and standards<\/h2>\n<ul class=\"tfs-src\">\n<li>INSO 3132 (Iranian National Standard): Hot-rolled steel bars for reinforcement of concrete, specifications and test methods<\/li>\n<li>ISO 6935-2: Steel for the reinforcement of concrete, Part 2: Ribbed bars<\/li>\n<li>ASTM A615\/A615M: Standard specification for deformed and plain carbon-steel bars for concrete reinforcement<\/li>\n<li>Iranian National Building Regulations, Part 9: Design and construction of reinforced concrete 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 A2 and A3 rebar?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A2 rebar (grade S340) has a minimum yield strength of 340 MPa and spiral ribs, while A3 rebar (grade S400) has a minimum yield strength of 400 MPa and herringbone ribs. A2 is more ductile; A3 is stronger.\"}}, {\"@type\": \"Question\", \"name\": \"How is rebar weight calculated?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Square the diameter in millimetres and divide by 162 to get the mass per metre in kilograms. Multiply by 12 for the nominal mass of a 12 m bar.\"}}, {\"@type\": \"Question\", \"name\": \"Why are ribbed bars used in concrete?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The ribs lock the bar mechanically into the concrete and prevent slip, so force is transferred effectively between the two materials.\"}}, {\"@type\": \"Question\", \"name\": \"Can rusty rebar be used?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A thin, adherent surface rust is usually not a problem. If the rust is flaking or has reduced the cross-section, the bar should be cleaned and checked for diameter and mass.\"}}, {\"@type\": \"Question\", \"name\": \"What is the standard length of a rebar?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The common bar length is 12 m. Small diameters are also produced in coils.\"}}]}<\/script><script>(function(){var F={rebar:{f:[['d',16],['L',12]],c:function(v){return v.d*v.d\/162}},sheet:{f:[['t',2],['B',1.25],['L',2.5]],c:function(v){return v.B*v.t*7.85}},pipe:{f:[['OD',60.3],['t',3.91],['L',6]],c:function(v){return (v.OD-v.t)*v.t*0.02466}},box:{f:[['a',40],['b',40],['t',2],['L',6]],c:function(v){return (2*(v.a+v.b)-4*v.t)*v.t*0.00785}},angle:{f:[['a',50],['t',5],['L',6]],c:function(v){return (2*v.a-v.t)*v.t*0.00785}},table:{f:[['S',0],['L',12]],c:function(v){return v.S}}};[].forEach.call(document.querySelectorAll('.tfs-pcalc'),function(root){if(root.dataset.ready){return}root.dataset.ready='1';var cfg=JSON.parse(root.dataset.cfg),T=F[cfg.type],box=root.querySelector('.tfs-pc-fields'),inputs={};function fmt(x){if(isFinite(x)){if(x>0){return x.toLocaleString(cfg.loc,{maximumFractionDigits:2,minimumFractionDigits:2})}}return '\\u2013'}function run(){var v={};T.f.forEach(function(f){v[f[0]]=parseFloat(inputs[f[0]].value)});var w=T.c(v);root.querySelector('.tfs-pc-perm').textContent=fmt(w);root.querySelector('.tfs-pc-total').textContent=fmt(w*v.L)}T.f.forEach(function(f){var lab=document.createElement('label');lab.appendChild(document.createTextNode(cfg.labels[f[0]]));var i;if(f[0]==='S'){i=document.createElement('select');cfg.sizes.forEach(function(s){var o=document.createElement('option');o.value=s[1];o.textContent=s[0];i.appendChild(o)});i.addEventListener('change',run)}else{i=document.createElement('input');i.type='number';i.step='any';i.min='0';i.value=(f[0]==='L')?cfg.len:f[1];i.inputMode='decimal';i.addEventListener('input',run)}lab.appendChild(i);box.appendChild(lab);inputs[f[0]]=i});run()})})();<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Rebar (reinforcing bar) is a solid round steel bar placed inside concrete to carry the tensile forces that concrete alone cannot resist. This guide covers rebar types, standard grades, rib patterns, the rebar weight chart, and practical notes on use and storage. 7850 kg\/m\u00b3Steel density 12 mCommon bar length 8 to 40 mmCommon diameters S240&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-2450","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/tfstrading.com\/en\/wp-json\/wp\/v2\/pages\/2450","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=2450"}],"version-history":[{"count":9,"href":"https:\/\/tfstrading.com\/en\/wp-json\/wp\/v2\/pages\/2450\/revisions"}],"predecessor-version":[{"id":3230,"href":"https:\/\/tfstrading.com\/en\/wp-json\/wp\/v2\/pages\/2450\/revisions\/3230"}],"wp:attachment":[{"href":"https:\/\/tfstrading.com\/en\/wp-json\/wp\/v2\/media?parent=2450"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}