{"id":21403,"date":"2026-10-09T06:35:44","date_gmt":"2026-10-08T22:35:44","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=21403"},"modified":"2026-10-09T07:34:03","modified_gmt":"2026-10-08T23:34:03","slug":"aluminum-extrusion-die-bearing-length","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/es\/aluminum-extrusion-die-bearing-length\/","title":{"rendered":"Longitud de apoyo en un dado de extrusi\u00f3n de aluminio"},"content":{"rendered":"\n<style>\n\n:root{\n    --aobo-accent:#2563eb; --aobo-accent-dark:#1e1e2e; --aobo-blue:#0c56d0; --aobo-blue-dark:#073b91;\n    --aobo-text:#333; --aobo-muted:#888; --aobo-border:#e5e7eb; --aobo-border-dark:#ddd;\n    --aobo-stripe:#f7f7f9; --aobo-hover:#e8f0fe; --aobo-radius:8px; --aobo-radius-sm:6px;\n    --aobo-orange:#f59e0b; --aobo-fill:#e9ecef;\n  }\n  *{box-sizing:border-box;}\n  html{-webkit-text-size-adjust:100%;}\n  body{margin:0;background:#fff;color:var(--aobo-text);\n    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!important}.entry-content[class] h2{font-size: 25px !important}.entry-content[class] h3{font-size: 20px !important}.entry-content[class] h4{font-size: 17px !important}.entry-content[class] p,.entry-content[class] li{font-size: 16px !important}.entry-content[class] table th,.entry-content[class] table td{font-size: 14px !important;padding: 11px 12px !important}.entry-content[class] .aobo-hero{padding: 30px 22px}.entry-content[class] .aobo-final-cta{padding: 26px 22px}.entry-content[class] .aobo-final-cta .aobo-btn{width: 100%}}\n<\/style>\n<section class=\"aobo-ht-ref ts-props\">\n<div class=\"aobo-wrap\">\n\n<div class=\"ts-hero\">\n<div class=\"ts-hero-top\">\n<div class=\"ts-kicker\"><span><\/span>Tool Steel | Aluminum Extrusion | Die Design<\/div>\n<h1 style=\"--h1-max:38px\">Bearing Length in an Aluminum Extrusion Die<\/h1>\n<p>The bearing, or die land, is the short parallel land the metal passes through at the very exit of the die. It is a few millimetres long and it decides almost everything about the extrusion. It sets the size, the shape, the surface finish and the speed, and it is the part of the die that wears. Getting the bearing length right is the core of die design, and the rule behind it is the same in every shop. The bearing is long where the metal flows fast and short where it flows slowly. This page sets out what the bearing controls, what decides its length, and the two cuts, choke and relief, that are used to trim it.<\/p>\n<\/div>\n<\/div>\n\n<div class=\"ts-tool-area\">\n\n<h2 class=\"ts-h2\">What the bearing controls<\/h2>\n<p class=\"ts-p\">The die designer treats the bearing as the one variable that can be adjusted after the opening itself is fixed. The opening sets the shape. The bearing sets how the metal arrives at that shape. Because the metal is pushed, not pulled, the flow is not even across the die face, and the bearing is what corrects it.<\/p>\n<div class=\"ts-table-wrap\">\n<table class=\"ts-table\">\n<thead>\n<tr>\n<th style=\"width:30%\">What the bearing sets<\/th><th>How it does it<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr><td class=\"ts-grade\">Size<\/td><td class=\"ts-safe\">It holds the final cross section while the metal leaves the die, so a longer land on one side pulls that side back<\/td><\/tr>\n<tr><td class=\"ts-grade\">Shape<\/td><td class=\"ts-safe\">It balances the flow between thick and thin parts of the profile, and an unbalanced bearing distorts the shape<\/td><\/tr>\n<tr><td class=\"ts-grade\">Surface finish<\/td><td class=\"ts-safe\">It controls how much the hot metal rubs on the die steel as it passes, so it sets die lines and pick up<\/td><\/tr>\n<tr><td class=\"ts-grade\">Extrusion speed<\/td><td class=\"ts-safe\">Friction at the land is what retards the metal, so the total bearing length caps the ram speed the die will run at<\/td><\/tr>\n<tr><td class=\"ts-grade\">Die life<\/td><td class=\"ts-safe\">The bearing is the part of the die in sliding contact with hot aluminum, so it is the part that wears out<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"ts-tcap\"><em>The functions of the die bearing. Size, shape, finish and speed are the four the source names first, and die life follows because the bearing is the surface that slides against hot aluminum.<\/em><\/p>\n\n<h2 class=\"ts-h2\">Why the bearing length changes across one die<\/h2>\n<p class=\"ts-p\">A bearing is never one length. In direct extrusion the metal drags on the container wall as the billet moves, so the metal at the centre of the billet runs ahead of the metal at the edge. Near the die opening the centre is faster and the edge is slower. To make the two arrive together, the bearing has to be shorter where the metal is slow and longer where it is fast, which in practice means the bearing is longest at the outside of the die and shortest near the centre. The same logic runs across a thin section. A thin leg of a profile flows slowly, so its bearing is shortened until the leg keeps pace with the heavier parts of the shape. Three things set the length at any one point.<\/p>\n<div class=\"ts-table-wrap\">\n<table class=\"ts-table\">\n<thead>\n<tr>\n<th style=\"width:34%\">Parameter<\/th><th style=\"width:22%\">Effect on bearing length<\/th><th>Reason<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr><td class=\"ts-grade\">Distance of the opening from the centre of the billet<\/td><td class=\"ts-safe\">Longer bearing further out<\/td><td class=\"ts-safe\">Friction at the billet and container interface slows the metal near the surface, so the bearing has to be longer near the edge to hold that metal back and even out the flow<\/td><\/tr>\n<tr><td class=\"ts-grade\">Section thickness at that point<\/td><td class=\"ts-safe\">Shorter bearing in a thin section<\/td><td class=\"ts-safe\">A thin section leaves the die through a small opening and flows slowly, so its bearing is reduced to let it catch up<\/td><\/tr>\n<tr><td class=\"ts-grade\">Pocket shape and size in front of the opening<\/td><td class=\"ts-safe\">Bearing set to match the pocket<\/td><td class=\"ts-safe\">The pocket is what feeds the opening, and how it is shaped decides how much metal arrives at each part of the bearing<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"ts-tcap\"><em>The three parameters that set the bearing length at a point on the die opening. The first two are properties of the shape and its position in the die, and the third is the designer&#8217;s main tool for changing the flow.<\/em><\/p>\n\n<h2 class=\"ts-h2\">Choke and relief, the two cuts that trim the bearing<\/h2>\n<p class=\"ts-p\">Once the die is made, the bearing is adjusted from the front or the back. A choke is cut on the entry side and slows the metal down. A relief is cut on the exit side and speeds it up. Both are normally produced by electrical discharge machining, so the amount taken off can be measured and passed back to the die designer or the die maker. The angles below are the values the source gives for hard 2000 and 7000 series alloys, and they are the practical range rather than a rule for every die.<\/p>\n<div class=\"ts-table-wrap\">\n<table class=\"ts-table\">\n<thead>\n<tr>\n<th style=\"width:18%\">Feature<\/th><th style=\"width:26%\">Where it is cut<\/th><th style=\"width:22%\">Usual amount<\/th><th>What it does<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr><td class=\"ts-grade\">Choke<\/td><td class=\"ts-safe\">Front of the bearing, on the billet side<\/td><td class=\"ts-safe\">An angle of up to 3 degrees<\/td><td class=\"ts-safe\">The metal is slowed as it enters, which fills out the die aperture and holds the dimensions. It is used on hard 2000 and 7000 series alloys<\/td><\/tr>\n<tr><td class=\"ts-grade\">Relief<\/td><td class=\"ts-safe\">Back of the bearing, on the exit side<\/td><td class=\"ts-safe\">An angle up to 7 degrees<\/td><td class=\"ts-safe\">The effective bearing gets shorter, so the metal speeds up as it leaves. It is the opposite adjustment to a choke<\/td><\/tr>\n<tr><td class=\"ts-grade\">Bearing width at a junction<\/td><td class=\"ts-safe\">Where one bearing length meets another<\/td><td class=\"ts-safe\">Blended, never left as a sharp step<\/td><td class=\"ts-safe\">A sharp change in bearing length makes the metal flow unevenly, and the result is a streak on the extrusion<\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"ts-tcap\"><em>Choke, relief and the blending of a bearing. Choking the front of the bearing is the standard treatment for hard alloys, where the aim is to fill the aperture and hold the dimensions. Relief at the back does the opposite, shortening the effective bearing and letting the metal run faster.<\/em><\/p>\n<div class=\"ts-dl\"><div class=\"ts-dl-txt\"><strong>Bearing length in an aluminum extrusion die, printable PDF<\/strong> What the bearing sets, the three parameters that decide its length at any point on the opening, and the choke and relief cuts used to trim it, in one reference sheet with our contact details.<\/div> <a class=\"ts-dl-btn\" href=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/10\/Aobo-Steel-Aluminum-Extrusion-Die-Bearing-Length.pdf\" download> <svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M12 3v12m0 0 4.5-4.5M12 15l-4.5-4.5M4 20h16\"\/><\/svg> Download PDF <\/a><\/div>\n\n<h2 class=\"ts-h2\">The single-bearing die<\/h2>\n<p class=\"ts-p\">In a recess die the cavity in front of the opening is a single stage. In a single-bearing die, also called an equal-bearing die, the cavity is made in several converging stages, and the flow is balanced by the area of those stages rather than by the bearing, so the bearing can stay the same all round the opening. The advantage is speed. The metal picks up velocity as it passes through each stage of a converging cavity, and because the volume of metal is constant at every stage, a cavity whose mean area is larger than the final opening delivers the metal faster than a plain feeder plate does. The source reports single-bearing dies built for three stages.<\/p>\n<p class=\"ts-p\">A sharp change in bearing length from one point to the next is one of the common causes of streaking, because the metal crossing a junction cannot follow the step. Where the change cannot be avoided it is blended, either with a progressive taper, a straight taper, or a radius.<\/p>\n\n<h2 class=\"ts-h2\">Where this leaves a die steel order<\/h2>\n<p class=\"ts-p\">The bearing is where the die steel meets the hot aluminum, so it is the part that has to hold its hardness at temperature and resist the metal sticking to it. The grade behind it is the chromium hot work steel AISI H13 and its European equivalent 1.2344, covered on the <a href=\"https:\/\/aobosteel.com\/h13-tool-steel\/\">H13 tool steel page<\/a>, and the extrusion supply programme is on the <a href=\"https:\/\/aobosteel.com\/1-2344-esr-h13-aluminum-extrusion-distributors\/\">1.2344 ESR H13 extrusion supply page<\/a>. What happens to the bearing after a few hundred billets is on the <a href=\"https:\/\/aobosteel.com\/aluminum-extrusion-die-wear\/\">aluminum extrusion die wear page<\/a>, the stack the bearing sits in is on the <a href=\"https:\/\/aobosteel.com\/aluminum-extrusion-die-types-and-tooling\/\">die types and tooling page<\/a>, and the range of shapes a given press can carry is on the <a href=\"https:\/\/aobosteel.com\/extrusion-die-circumscribing-circle-diameter\/\">circumscribing circle diameter page<\/a>. Hardening the bearing surface is covered on the <a href=\"https:\/\/aobosteel.com\/tool-steel-nitriding-guide\/\">tool steel nitriding page<\/a>, and the grade choice by component on the <a href=\"https:\/\/aobosteel.com\/best-tool-steels-for-aluminum-extrusion-dies\/\">best tool steels for aluminum extrusion dies page<\/a>.<\/p>\n\n<div class=\"ts-disclaimer\">\n<h3>Before you set a bearing length from this page<\/h3>\n<p>This page is a reference summary of published practice and it is not an Aobo Steel specification. The bearing length on a real die is set by the die designer from the shape, the alloy, the press and the extrusion ratio, and it is corrected at the press after the first run. The choke and relief angles above are the values the source gives for hard alloys and they are a starting range, not a rule. Final design and correction are confirmed on the job.<\/p>\n<\/div>\n\n<p class=\"ts-source\">Source, Aluminum Extrusion Technology, P. K. Saha, ASM International, 2000.<\/p>\n\n<\/div><\/div><\/section>\n\n","protected":false},"excerpt":{"rendered":"<p>Tool Steel | Aluminum Extrusion | Die Design Bearing Length in an Aluminum Extrusion Die The bearing, or die land, is the short parallel land the metal passes through at the very exit of the die. It is a few millimetres long and it decides almost everything about the extrusion. It sets the size, the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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Steel | Aluminum Extrusion | Die Design Bearing Length in an Aluminum Extrusion Die The bearing, or die land, is the short parallel land the metal passes through at the very exit of the die. 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