Toothed belt profiles: essential guide to selection<\/title>\n\n <link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n <link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin=\"\">\n <link href=\"https:\/\/fonts.googleapis.com\/css2?family=Inter:wght@400;500;600;700&display=swap\" rel=\"stylesheet\">\n\n <style>\n *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }\n\n :root {\n --green: #1a6b3c;\n --green-dark: #0f4a28;\n --green-mid: #2d8a55;\n --green-light: #e8f4ed;\n --green-xlight: #f2faf5;\n --amber: #b45309;\n --amber-light: #fef3c7;\n\n --bg: #ffffff;\n --bg-soft: #f8f9fa;\n --bg-muted: #f1f3f5;\n --border: #e5e7eb;\n --border-mid: #d1d5db;\n\n --text-primary: #111827;\n --text-secondary: #4b5563;\n --text-muted: #9ca3af;\n\n --radius-sm: 6px;\n --radius-md: 8px;\n --radius-lg: 12px;\n --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);\n --shadow-md: 0 4px 12px rgba(0,0,0,.08), 0 2px 4px rgba(0,0,0,.04);\n }\n\n body { min-height: 100vh; 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}\n\n .badge {\n display: inline-block;\n font-size: 12px;\n font-weight: 600;\n padding: 2px 8px;\n border-radius: 20px;\n background: var(--green-light);\n color: var(--green-dark);\n }\n\n \/* ============================================================\n RESPONSIVE\n ============================================================ *\/\n @media (max-width: 900px) {\n .article-body { flex-direction: column; padding: 20px 20px 48px; }\n }\n \n \/* Glossary tooltips *\/\n .glossary-term {\n border-bottom: 1px dotted var(--green);\n color: var(--green);\n font-style: italic;\n cursor: help;\n }\n .glossary-tooltip {\n position: fixed;\n z-index: 9999;\n background: #fff;\n border: 1px solid var(--border-mid);\n border-radius: var(--radius-md);\n box-shadow: var(--shadow-md);\n padding: 10px 14px;\n max-width: 300px;\n font-family: 'Inter', sans-serif;\n font-size: 13px;\n }\n .glossary-tooltip__title {\n font-weight: 600;\n color: var(--text-primary);\n margin-bottom: 4px;\n }\n .glossary-tooltip__def {\n font-size: 12.5px;\n color: var(--text-secondary);\n line-height: 1.6;\n }\n .glossary-tooltip__tag {\n display: inline-block;\n margin-top: 6px;\n font-size: 9px;\n font-weight: 600;\n padding: 2px 7px;\n border-radius: 20px;\n background: var(--green-light);\n color: var(--green-dark);\n text-transform: uppercase;\n letter-spacing: 0.04em;\n }\n\n <\/style>\n<\/head>\n<body>\n\n<div id=\"tt-gioco-di-flanchi-backlash\" class=\"glossary-tooltip\" hidden=\"\">\n <div class=\"glossary-tooltip__title\">Backlash<\/div>\n <div class=\"glossary-tooltip__def\">Free clearance between the flanks of two mating teeth, measured at the pitch circle. It prevents jamming due to thermal expansion or assembly errors.<\/div>\n <span class=\"glossary-tooltip__tag\">Glossary<\/span>\n<\/div>\n\n <div class=\"article-page\">\n <div class=\"article-body\">\n <div class=\"article-body__main\"><script type=\"application\/ld+json\">\n{\n \"@context\": \"https:\/\/schema.org\",\n \"@graph\": [\n {\n \"@type\": \"TechArticle\",\n \"@id\": \"#article\",\n \"headline\": \"Toothed belt profiles: essential guide to selection\",\n \"description\": \"You have a toothed belt that skips teeth under load, or a noisy transmission you can't quiet. Often the problem isn't the sizing, but the chosen profile: each series has a geometry optimized for specific conditions, and using one out of context means wasting potential or failing earlier than expected.\",\n \"inLanguage\": \"en\",\n \"mentions\": [\n {\n \"@id\": \"#term-gioco-di-flanchi-backlash\"\n }\n ]\n },\n {\n \"@type\": \"DefinedTermSet\",\n \"@id\": \"#glossario\",\n \"name\": \"Glossario - Toothed belt profiles: essential guide to selection\",\n \"hasDefinedTerm\": [\n {\n \"@type\": \"DefinedTerm\",\n \"@id\": \"#term-gioco-di-flanchi-backlash\",\n \"name\": \"Backlash\",\n \"description\": \"Free clearance between the flanks of two mating teeth, measured at the pitch circle. It prevents jamming due to thermal expansion or assembly errors.\",\n \"inDefinedTermSet\": \"#glossario\"\n }\n ]\n }\n ]\n}\n<\/script>\n\n\n\n <h1 class=\"article__title\">Toothed belt profiles: essential guide to selection<\/h1>\n<p class=\"article__subtitle\">You have a toothed belt that skips teeth under load, or a noisy transmission you can’t quiet. Often the problem isn’t the sizing, but the chosen profile: each series has a geometry optimized for specific conditions, and using one out of context means wasting potential or failing earlier than expected.<\/p>\n<h2 class=\"article__h2\" id=\"why-do-different-profiles-exist\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"10\"><\/circle><path d=\"M9.09 9a3 3 0 0 1 5.83 1c0 2-3 3-3 3\"><\/path><line x1=\"12\" y1=\"17\" x2=\"12.01\" y2=\"17\"><\/line><\/svg><\/span>\n Why do different profiles exist?\n<\/h2>\n<p class=\"article__p\">Toothed-belt profiles differ in tooth geometry to optimize load distribution, reduce vibration and handle different powers. The first distinction you have to make is between metric pitch and inch pitch. Metric profiles (T, AT, HTD, GT) are the European standard; the inch ones (XL, L, H, XH) derive from North American standards and you find them mainly on imported machines or legacy installations.<\/p>\n<div class=\"article__table-wrap\">\n<table class=\"article__table\">\n<thead><tr><th>Profile<\/th><th>Indicative pitch<\/th><th>Tooth geometry<\/th><th>Load capacity<\/th><th>Precision\/Noise<\/th><th>Typical applications<\/th><\/tr><\/thead>\n<tbody><tr><td>T<\/td><td>T2.5, T5, T10<\/td><td>Trapezoidal 40\u00b0<\/td><td>Standard<\/td><td>Good precision, medium noise<\/td><td>Basic automation, packaging<\/td><\/tr>\n<tr><td>AT<\/td><td>AT3, AT5, AT8<\/td><td>Reinforced trapezoidal<\/td><td>Superior to T<\/td><td>Greater stability under load<\/td><td>Linear axes, medium loads<\/td><\/tr>\n<tr><td>GT<\/td><td>GT2, GT3, GT4<\/td><td>Evolved curvilinear<\/td><td>High<\/td><td>Low noise, low <dfn id=\"def-gioco-di-flanchi-backlash\"><span class=\"glossary-term\" data-tooltip=\"tt-gioco-di-flanchi-backlash\" title=\"Free clearance between the flanks of two mating teeth, measured at the pitch circle. It prevents jamming due to thermal expansion or assembly errors.\">backlash<\/span><\/dfn><\/td><td>Robotics, CNC, 3D printing<\/td><\/tr>\n<tr><td>XL<\/td><td>0.200″ \/ 5.08 mm<\/td><td>Trapezoidal inch<\/td><td>Light<\/td><td>High speed, reduced loads<\/td><td>USA machines, spares<\/td><\/tr>\n<tr><td>L \/ H<\/td><td>0.375″\/0.500″<\/td><td>Trapezoidal inch<\/td><td>Medium\/High<\/td><td>Robust, less compact<\/td><td>General transmissions<\/td><\/tr>\n<tr><td>XH<\/td><td>0.875″<\/td><td>Trapezoidal inch<\/td><td>Very high<\/td><td>For high power<\/td><td>Heavy transmissions<\/td><\/tr>\n<tr><td>HTD<\/td><td>3M, 5M, 8M, 14M<\/td><td>Arc curvilinear<\/td><td>High<\/td><td>Lower stress concentrations<\/td><td>High torque, industrial automation<\/td><\/tr><\/tbody>\n<\/table>\n<\/div>\n<h2 class=\"article__h2\" id=\"metric-pitch-profiles\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><line x1=\"4\" y1=\"21\" x2=\"4\" y2=\"14\"><\/line><line x1=\"4\" y1=\"10\" x2=\"4\" y2=\"3\"><\/line><line x1=\"12\" y1=\"21\" x2=\"12\" y2=\"12\"><\/line><line x1=\"12\" y1=\"8\" x2=\"12\" y2=\"3\"><\/line><line x1=\"20\" y1=\"21\" x2=\"20\" y2=\"16\"><\/line><line x1=\"20\" y1=\"12\" x2=\"20\" y2=\"3\"><\/line><line x1=\"1\" y1=\"14\" x2=\"7\" y2=\"14\"><\/line><line x1=\"9\" y1=\"8\" x2=\"15\" y2=\"8\"><\/line><line x1=\"17\" y1=\"16\" x2=\"23\" y2=\"16\"><\/line><\/svg><\/span>\n Metric-pitch profiles\n<\/h2>\n<p class=\"article__p\">The T series is the simplest and most economical: trapezoidal geometry at 40\u00b0, suited to moderate loads and standard automation. If you have higher loads or linear axes, switch to the AT series, which has wider teeth and superior strength.<\/p>\n<p class=\"article__p\">The GT series uses an evolved curvilinear profile that reduces backlash (the gap between the tooth flanks) and lowers noise significantly. It’s the standard choice for robotics, CNC and 3D printing, where positioning precision is critical.<\/p>\n<p class=\"article__p\">An advantage common to all metric profiles is the absence of lubrication. In food and medical environments, where cleanliness is a design requirement, this characteristic is decisive. In these sectors you often find polyurethane belts paired with technopolymer pulleys, such as PA6 reinforced with 30% glass fiber (PA6+30%GF).<\/p>\n<h2 class=\"article__h2\" id=\"inch-pitch-profiles\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"10\"><\/circle><line x1=\"2\" y1=\"12\" x2=\"22\" y2=\"12\"><\/line><path d=\"M12 2a15.3 15.3 0 0 1 4 10 15.3 15.3 0 0 1-4 10 15.3 15.3 0 0 1-4-10 15.3 15.3 0 0 1 4-10z\"><\/path><\/svg><\/span>\n Inch-pitch profiles\n<\/h2>\n<p class=\"article__p\">If you work on a machine imported from the USA or on a legacy installation, you probably already have inch profiles in the catalog. The XL series (5.08 mm pitch) covers light high-speed applications. The L and H series move up to medium and heavy loads. The XH is designed for high-power transmissions.<\/p>\n<div class=\"warnbox\">\n <div class=\"warnbox__title\">\n <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M10.29 3.86L1.82 18a2 2 0 0 0 1.71 3h16.94a2 2 0 0 0 1.71-3L13.71 3.86a2 2 0 0 0-3.42 0z\"><\/path><line x1=\"12\" y1=\"9\" x2=\"12\" y2=\"13\"><\/line><line x1=\"12\" y1=\"17\" x2=\"12.01\" y2=\"17\"><\/line><\/svg>\n Warning\n <\/div>\n <p class=\"warnbox__text\">Don’t mix belts and pulleys of different series, even if the pitch seems similar. Metric and inch aren’t interchangeable: different geometries cause accelerated wear and a risk of failure.<\/p>\n<\/div>\n<h2 class=\"article__h2\" id=\"htd-high-torque-drive-profile\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><polygon points=\"13 2 3 14 12 14 11 22 21 10 12 10 13 2\"><\/polygon><\/svg><\/span>\n HTD (High Torque Drive) profile\n<\/h2>\n<p class=\"article__p\">The HTD is the circular-arc tooth profile designed to transmit high torques. The curvilinear geometry distributes the load more uniformly than the trapezoidal profile, reducing stress concentrations and improving durability. The pitches range from 3M to 20M.<\/p>\n<div class=\"infobox infobox--grey\">\n <div class=\"infobox__title\">\n <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M14.7 6.3a1 1 0 0 0 0 1.4l1.6 1.6a1 1 0 0 0 1.4 0l3.77-3.77a6 6 0 0 1-7.94 7.94l-6.91 6.91a2.12 2.12 0 0 1-3-3l6.91-6.91a6 6 0 0 1 7.94-7.94l-3.76 3.76z\"><\/path><\/svg>\n Technical note\n <\/div>\n <p class=\"infobox__text\">HTD pulleys are made in aluminum, cast iron, steel or reinforced technopolymer. For mounting, Taper-Lock systems allow precise centering and fast disassembly without special tools.<\/p>\n<\/div>\n<h2 class=\"article__h2\" id=\"profile-selection-based-on-the-application\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"10\"><\/circle><circle cx=\"12\" cy=\"12\" r=\"6\"><\/circle><circle cx=\"12\" cy=\"12\" r=\"2\"><\/circle><\/svg><\/span>\n Profile selection based on the application\n<\/h2>\n<ul class=\"article__list\">\n <li><strong>Automation and robotics<\/strong>: GT2, GT3 or HTD 3M\/5M for precision and quietness.<\/li>\n <li><strong>Food packaging<\/strong>: T or AT series with polyurethane belts and PA6+30%GF pulleys, without lubrication.<\/li>\n <li><strong>High speed<\/strong>: HTD 3M, 5M or GT for smooth rotation with reduced moving masses.<\/li>\n <li><strong>Heavy applications<\/strong>: HTD 8M, 14M or H\/XH profiles for high power and long durability.<\/li>\n<\/ul>\n<h2 class=\"article__h2\" id=\"technopolymer-pulleys\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><line x1=\"16.5\" y1=\"9.4\" x2=\"7.5\" y2=\"4.21\"><\/line><path d=\"M21 16V8a2 2 0 0 0-1-1.73l-7-4a2 2 0 0 0-2 0l-7 4A2 2 0 0 0 3 8v8a2 2 0 0 0 1 1.73l7 4a2 2 0 0 0 2 0l7-4A2 2 0 0 0 21 16z\"><\/path><polyline points=\"3.27 6.96 12 12.01 20.73 6.96\"><\/polyline><line x1=\"12\" y1=\"22.08\" x2=\"12\" y2=\"12\"><\/line><\/svg><\/span>\n Technopolymer pulleys\n<\/h2>\n<p class=\"article__p\">Compared with metal pulleys, technopolymer ones reduce weight, lower noise and resist corrosion better. Metal replacement with materials such as glass-fiber, carbon or PTFE-reinforced PA improves overall performance without adding mass. CAD\/CAM design lets you optimize the pulley geometry and guarantee dimensional reproducibility across pieces. Once you’ve chosen the profile, on <a href=\"https:\/\/www.traceparts.com\/it\/search\/stagnoli?CatalogPath=STAGNOLI%3AF_STAGNOLI\" target=\"_blank\" rel=\"noopener\" class=\"cta-link\">TraceParts<\/a> you’ll find the dedicated category for Stagnoli pulleys with all the 3D models: download the geometry and integrate it directly into your project.<\/p>\n<div class=\"infobox\">\n <div class=\"infobox__title\">\n <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M4 4h16c1.1 0 2 .9 2 2v12c0 1.1-.9 2-2 2H4c-1.1 0-2-.9-2-2V6c0-1.1.9-2 2-2z\"><\/path><polyline points=\"22,6 12,13 2,6\"><\/polyline><\/svg>\n Ask us\n <\/div>\n <p class=\"infobox__text\">If your operating conditions (torque, speed, environment) fall outside the standard cases described here, <a href=\"https:\/\/shop.stagnoligears.com\/en\/contacts\/\" target=\"_blank\" rel=\"noopener\" class=\"cta-link\">write<\/a> to the technical office. We assess the most suitable profile and material for your application together.<\/p>\n<\/div>\n\n <\/div>\n <\/div>\n <\/div>\n\n\n<script>\n (function () {\n var hideTimers = {};\n function positionTooltip(trigger, tooltip) {\n var margin = 8;\n tooltip.style.visibility = 'hidden';\n tooltip.style.top = '-9999px';\n tooltip.style.left = '-9999px';\n tooltip.removeAttribute('hidden');\n var ttRect = tooltip.getBoundingClientRect();\n var trRect = trigger.getBoundingClientRect();\n var vw = window.innerWidth, vh = window.innerHeight;\n var top = trRect.bottom + margin;\n var left = trRect.left;\n if (top + ttRect.height + margin > vh) {\n var above = trRect.top - ttRect.height - margin;\n top = above >= margin ? above : Math.max(margin, vh - ttRect.height - margin);\n }\n if (left + ttRect.width + margin > vw) left = vw - ttRect.width - margin;\n if (left < margin) left = margin;\n tooltip.style.top = top + 'px';\n tooltip.style.left = left + 'px';\n tooltip.style.visibility = '';\n }\n 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{"id":25611,"date":"2026-06-30T12:34:12","date_gmt":"2026-06-30T10:34:12","guid":{"rendered":"https:\/\/shop.stagnoligears.com\/?post_type=centro-tecnico&p=25611"},"modified":"2026-07-10T13:54:16","modified_gmt":"2026-07-10T11:54:16","slug":"toothed-belt-profiles-essential-guide-to-selection","status":"publish","type":"centro-tecnico","link":"https:\/\/shop.stagnoligears.com\/en\/technical-hub\/toothed-belt-profiles-essential-guide-to-selection\/","title":{"rendered":"Toothed belt profiles: essential guide to selection"},"content":{"rendered":"\n\n \n \n \n Toothed belt profiles: essential guide to selection<\/title>\n\n <link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n <link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin=\"\">\n <link href=\"https:\/\/fonts.googleapis.com\/css2?family=Inter:wght@400;500;600;700&display=swap\" rel=\"stylesheet\">\n\n <style>\n *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }\n\n :root {\n --green: #1a6b3c;\n --green-dark: #0f4a28;\n --green-mid: #2d8a55;\n --green-light: #e8f4ed;\n --green-xlight: #f2faf5;\n --amber: #b45309;\n --amber-light: #fef3c7;\n\n --bg: #ffffff;\n --bg-soft: #f8f9fa;\n --bg-muted: #f1f3f5;\n --border: #e5e7eb;\n --border-mid: #d1d5db;\n\n --text-primary: #111827;\n --text-secondary: #4b5563;\n --text-muted: #9ca3af;\n\n --radius-sm: 6px;\n --radius-md: 8px;\n --radius-lg: 12px;\n --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);\n --shadow-md: 0 4px 12px rgba(0,0,0,.08), 0 2px 4px rgba(0,0,0,.04);\n }\n\n body { min-height: 100vh; 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It prevents jamming due to thermal expansion or assembly errors.<\/div>\n <span class=\"glossary-tooltip__tag\">Glossary<\/span>\n<\/div>\n\n <div class=\"article-page\">\n <div class=\"article-body\">\n <div class=\"article-body__main\"><script type=\"application\/ld+json\">\n{\n \"@context\": \"https:\/\/schema.org\",\n \"@graph\": [\n {\n \"@type\": \"TechArticle\",\n \"@id\": \"#article\",\n \"headline\": \"Toothed belt profiles: essential guide to selection\",\n \"description\": \"You have a toothed belt that skips teeth under load, or a noisy transmission you can't quiet. 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It prevents jamming due to thermal expansion or assembly errors.\",\n \"inDefinedTermSet\": \"#glossario\"\n }\n ]\n }\n ]\n}\n<\/script>\n\n\n\n <h1 class=\"article__title\">Toothed belt profiles: essential guide to selection<\/h1>\n<p class=\"article__subtitle\">You have a toothed belt that skips teeth under load, or a noisy transmission you can’t quiet. Often the problem isn’t the sizing, but the chosen profile: each series has a geometry optimized for specific conditions, and using one out of context means wasting potential or failing earlier than expected.<\/p>\n<h2 class=\"article__h2\" id=\"why-do-different-profiles-exist\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"10\"><\/circle><path d=\"M9.09 9a3 3 0 0 1 5.83 1c0 2-3 3-3 3\"><\/path><line x1=\"12\" y1=\"17\" x2=\"12.01\" y2=\"17\"><\/line><\/svg><\/span>\n Why do different profiles exist?\n<\/h2>\n<p class=\"article__p\">Toothed-belt profiles differ in tooth geometry to optimize load distribution, reduce vibration and handle different powers. The first distinction you have to make is between metric pitch and inch pitch. Metric profiles (T, AT, HTD, GT) are the European standard; the inch ones (XL, L, H, XH) derive from North American standards and you find them mainly on imported machines or legacy installations.<\/p>\n<div class=\"article__table-wrap\">\n<table class=\"article__table\">\n<thead><tr><th>Profile<\/th><th>Indicative pitch<\/th><th>Tooth geometry<\/th><th>Load capacity<\/th><th>Precision\/Noise<\/th><th>Typical applications<\/th><\/tr><\/thead>\n<tbody><tr><td>T<\/td><td>T2.5, T5, T10<\/td><td>Trapezoidal 40\u00b0<\/td><td>Standard<\/td><td>Good precision, medium noise<\/td><td>Basic automation, packaging<\/td><\/tr>\n<tr><td>AT<\/td><td>AT3, AT5, AT8<\/td><td>Reinforced trapezoidal<\/td><td>Superior to T<\/td><td>Greater stability under load<\/td><td>Linear axes, medium loads<\/td><\/tr>\n<tr><td>GT<\/td><td>GT2, GT3, GT4<\/td><td>Evolved curvilinear<\/td><td>High<\/td><td>Low noise, low <dfn id=\"def-gioco-di-flanchi-backlash\"><span class=\"glossary-term\" data-tooltip=\"tt-gioco-di-flanchi-backlash\" title=\"Free clearance between the flanks of two mating teeth, measured at the pitch circle. It prevents jamming due to thermal expansion or assembly errors.\">backlash<\/span><\/dfn><\/td><td>Robotics, CNC, 3D printing<\/td><\/tr>\n<tr><td>XL<\/td><td>0.200″ \/ 5.08 mm<\/td><td>Trapezoidal inch<\/td><td>Light<\/td><td>High speed, reduced loads<\/td><td>USA machines, spares<\/td><\/tr>\n<tr><td>L \/ H<\/td><td>0.375″\/0.500″<\/td><td>Trapezoidal inch<\/td><td>Medium\/High<\/td><td>Robust, less compact<\/td><td>General transmissions<\/td><\/tr>\n<tr><td>XH<\/td><td>0.875″<\/td><td>Trapezoidal inch<\/td><td>Very high<\/td><td>For high power<\/td><td>Heavy transmissions<\/td><\/tr>\n<tr><td>HTD<\/td><td>3M, 5M, 8M, 14M<\/td><td>Arc curvilinear<\/td><td>High<\/td><td>Lower stress concentrations<\/td><td>High torque, industrial automation<\/td><\/tr><\/tbody>\n<\/table>\n<\/div>\n<h2 class=\"article__h2\" id=\"metric-pitch-profiles\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><line x1=\"4\" y1=\"21\" x2=\"4\" y2=\"14\"><\/line><line x1=\"4\" y1=\"10\" x2=\"4\" y2=\"3\"><\/line><line x1=\"12\" y1=\"21\" x2=\"12\" y2=\"12\"><\/line><line x1=\"12\" y1=\"8\" x2=\"12\" y2=\"3\"><\/line><line x1=\"20\" y1=\"21\" x2=\"20\" y2=\"16\"><\/line><line x1=\"20\" y1=\"12\" x2=\"20\" y2=\"3\"><\/line><line x1=\"1\" y1=\"14\" x2=\"7\" y2=\"14\"><\/line><line x1=\"9\" y1=\"8\" x2=\"15\" y2=\"8\"><\/line><line x1=\"17\" y1=\"16\" x2=\"23\" y2=\"16\"><\/line><\/svg><\/span>\n Metric-pitch profiles\n<\/h2>\n<p class=\"article__p\">The T series is the simplest and most economical: trapezoidal geometry at 40\u00b0, suited to moderate loads and standard automation. If you have higher loads or linear axes, switch to the AT series, which has wider teeth and superior strength.<\/p>\n<p class=\"article__p\">The GT series uses an evolved curvilinear profile that reduces backlash (the gap between the tooth flanks) and lowers noise significantly. It’s the standard choice for robotics, CNC and 3D printing, where positioning precision is critical.<\/p>\n<p class=\"article__p\">An advantage common to all metric profiles is the absence of lubrication. In food and medical environments, where cleanliness is a design requirement, this characteristic is decisive. In these sectors you often find polyurethane belts paired with technopolymer pulleys, such as PA6 reinforced with 30% glass fiber (PA6+30%GF).<\/p>\n<h2 class=\"article__h2\" id=\"inch-pitch-profiles\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"10\"><\/circle><line x1=\"2\" y1=\"12\" x2=\"22\" y2=\"12\"><\/line><path d=\"M12 2a15.3 15.3 0 0 1 4 10 15.3 15.3 0 0 1-4 10 15.3 15.3 0 0 1-4-10 15.3 15.3 0 0 1 4-10z\"><\/path><\/svg><\/span>\n Inch-pitch profiles\n<\/h2>\n<p class=\"article__p\">If you work on a machine imported from the USA or on a legacy installation, you probably already have inch profiles in the catalog. The XL series (5.08 mm pitch) covers light high-speed applications. The L and H series move up to medium and heavy loads. The XH is designed for high-power transmissions.<\/p>\n<div class=\"warnbox\">\n <div class=\"warnbox__title\">\n <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M10.29 3.86L1.82 18a2 2 0 0 0 1.71 3h16.94a2 2 0 0 0 1.71-3L13.71 3.86a2 2 0 0 0-3.42 0z\"><\/path><line x1=\"12\" y1=\"9\" x2=\"12\" y2=\"13\"><\/line><line x1=\"12\" y1=\"17\" x2=\"12.01\" y2=\"17\"><\/line><\/svg>\n Warning\n <\/div>\n <p class=\"warnbox__text\">Don’t mix belts and pulleys of different series, even if the pitch seems similar. Metric and inch aren’t interchangeable: different geometries cause accelerated wear and a risk of failure.<\/p>\n<\/div>\n<h2 class=\"article__h2\" id=\"htd-high-torque-drive-profile\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><polygon points=\"13 2 3 14 12 14 11 22 21 10 12 10 13 2\"><\/polygon><\/svg><\/span>\n HTD (High Torque Drive) profile\n<\/h2>\n<p class=\"article__p\">The HTD is the circular-arc tooth profile designed to transmit high torques. The curvilinear geometry distributes the load more uniformly than the trapezoidal profile, reducing stress concentrations and improving durability. The pitches range from 3M to 20M.<\/p>\n<div class=\"infobox infobox--grey\">\n <div class=\"infobox__title\">\n <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M14.7 6.3a1 1 0 0 0 0 1.4l1.6 1.6a1 1 0 0 0 1.4 0l3.77-3.77a6 6 0 0 1-7.94 7.94l-6.91 6.91a2.12 2.12 0 0 1-3-3l6.91-6.91a6 6 0 0 1 7.94-7.94l-3.76 3.76z\"><\/path><\/svg>\n Technical note\n <\/div>\n <p class=\"infobox__text\">HTD pulleys are made in aluminum, cast iron, steel or reinforced technopolymer. For mounting, Taper-Lock systems allow precise centering and fast disassembly without special tools.<\/p>\n<\/div>\n<h2 class=\"article__h2\" id=\"profile-selection-based-on-the-application\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"10\"><\/circle><circle cx=\"12\" cy=\"12\" r=\"6\"><\/circle><circle cx=\"12\" cy=\"12\" r=\"2\"><\/circle><\/svg><\/span>\n Profile selection based on the application\n<\/h2>\n<ul class=\"article__list\">\n <li><strong>Automation and robotics<\/strong>: GT2, GT3 or HTD 3M\/5M for precision and quietness.<\/li>\n <li><strong>Food packaging<\/strong>: T or AT series with polyurethane belts and PA6+30%GF pulleys, without lubrication.<\/li>\n <li><strong>High speed<\/strong>: HTD 3M, 5M or GT for smooth rotation with reduced moving masses.<\/li>\n <li><strong>Heavy applications<\/strong>: HTD 8M, 14M or H\/XH profiles for high power and long durability.<\/li>\n<\/ul>\n<h2 class=\"article__h2\" id=\"technopolymer-pulleys\">\n <span class=\"article__h2-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><line x1=\"16.5\" y1=\"9.4\" x2=\"7.5\" y2=\"4.21\"><\/line><path d=\"M21 16V8a2 2 0 0 0-1-1.73l-7-4a2 2 0 0 0-2 0l-7 4A2 2 0 0 0 3 8v8a2 2 0 0 0 1 1.73l7 4a2 2 0 0 0 2 0l7-4A2 2 0 0 0 21 16z\"><\/path><polyline points=\"3.27 6.96 12 12.01 20.73 6.96\"><\/polyline><line x1=\"12\" y1=\"22.08\" x2=\"12\" y2=\"12\"><\/line><\/svg><\/span>\n Technopolymer pulleys\n<\/h2>\n<p class=\"article__p\">Compared with metal pulleys, technopolymer ones reduce weight, lower noise and resist corrosion better. Metal replacement with materials such as glass-fiber, carbon or PTFE-reinforced PA improves overall performance without adding mass. CAD\/CAM design lets you optimize the pulley geometry and guarantee dimensional reproducibility across pieces. Once you’ve chosen the profile, on <a href=\"https:\/\/www.traceparts.com\/it\/search\/stagnoli?CatalogPath=STAGNOLI%3AF_STAGNOLI\" target=\"_blank\" rel=\"noopener\" class=\"cta-link\">TraceParts<\/a> you’ll find the dedicated category for Stagnoli pulleys with all the 3D models: download the geometry and integrate it directly into your project.<\/p>\n<div class=\"infobox\">\n <div class=\"infobox__title\">\n <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M4 4h16c1.1 0 2 .9 2 2v12c0 1.1-.9 2-2 2H4c-1.1 0-2-.9-2-2V6c0-1.1.9-2 2-2z\"><\/path><polyline points=\"22,6 12,13 2,6\"><\/polyline><\/svg>\n Ask us\n <\/div>\n <p class=\"infobox__text\">If your operating conditions (torque, speed, environment) fall outside the standard cases described here, <a href=\"https:\/\/shop.stagnoligears.com\/en\/contacts\/\" target=\"_blank\" rel=\"noopener\" class=\"cta-link\">write<\/a> to the technical office. We assess the most suitable profile and material for your application together.<\/p>\n<\/div>\n\n <\/div>\n <\/div>\n <\/div>\n\n\n<script>\n (function () {\n var hideTimers = {};\n function positionTooltip(trigger, tooltip) {\n var margin = 8;\n tooltip.style.visibility = 'hidden';\n tooltip.style.top = '-9999px';\n tooltip.style.left = '-9999px';\n tooltip.removeAttribute('hidden');\n var ttRect = tooltip.getBoundingClientRect();\n var trRect = trigger.getBoundingClientRect();\n var vw = window.innerWidth, vh = window.innerHeight;\n var top = trRect.bottom + margin;\n var left = trRect.left;\n if (top + ttRect.height + margin > vh) {\n var above = trRect.top - ttRect.height - margin;\n top = above >= margin ? above : Math.max(margin, vh - ttRect.height - margin);\n }\n if (left + ttRect.width + margin > vw) left = vw - ttRect.width - margin;\n if (left < margin) left = margin;\n tooltip.style.top = top + 'px';\n tooltip.style.left = left + 'px';\n tooltip.style.visibility = '';\n }\n 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