{"product_id":"timing-belt-8yu-30mm-closed-loop-synchronous-belt","title":"Timing Belt 8YU 30mm Wide Closed Loop Synchronous Belt — 520mm to 2000mm","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003c!-- ① OVERVIEW --\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e8YU Closed Loop Synchronous Timing Belt — Precise Power Transmission in 30mm Width\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping V-belt or worn drive chain causes your CNC router, 3D printer gantry, conveyor, or automated machine to lose position accuracy, the fix is a properly sized synchronous timing belt. This 8YU closed loop synchronous timing belt is engineered for engineers, makers, and maintenance professionals who need repeatable, slip-free motion transfer without the noise and stretch of chain drives.\u003c\/p\u003e\n\u003cp\u003eEach belt in this listing is a single closed-loop 8YU synchronous belt, 30mm (≈1.18\") wide, with an 8mm tooth pitch and a curvilinear tooth profile. Belts are available in circumference lengths from 520mm (≈20.5\") to 2000mm (≈78.7\") — select your exact length from the variant dropdown above. The construction typically consists of a neoprene or EPDM rubber body reinforced with a fiberglass or steel cord tension member, providing low elongation under load.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include CNC machine X\/Y axis drives, laser cutter gantry systems, 3D printer motion systems, light-duty conveyor indexing, and industrial automation linear actuators — anywhere a closed loop synchronous timing belt with 8mm pitch is specified. The 30mm width suits medium-torque applications where a narrower belt would be undersized.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- ② COMPATIBILITY BAR --\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003eℹ️\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits any 8YU \/ HTD-8M pulley or sprocket with a 30mm-wide groove. Verify your pulley profile, groove width, and required belt circumference before ordering. Not interchangeable with GT2, T5, T10, or other pitch profiles.\u003c\/div\u003e\n\u003c!-- ③ KEY FEATURES --\u003e\n\u003ch2\u003e✅ Key Features of These 8YU Closed Loop Synchronous Timing Belts\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🦷\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e8mm Curvilinear Tooth Profile\u003c\/strong\u003e — The 8YU \/ HTD-8M tooth geometry distributes load across a larger contact area than trapezoidal profiles, reducing tooth shear stress and the likelihood of tooth jump under shock loads in CNC and automation drives.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Length Selection (520–2000mm)\u003c\/strong\u003e — With 55 discrete circumference options in increments as small as 8mm, you can match the exact center distance of your machine without modifying the frame or using an idler as a workaround.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e↔️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e30mm Consistent Belt Width\u003c\/strong\u003e — A uniform 30mm width across all length variants ensures the belt tracks correctly in flanged pulleys and maintains consistent tension distribution, important for linear motion accuracy in gantry systems.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFiber-Reinforced Tension Member\u003c\/strong\u003e — The embedded fiberglass or steel cord tension member keeps elongation low under sustained load, helping maintain positional accuracy in closed-loop servo and stepper motor drive systems.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔇\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eQuieter Operation Than Chain Drives\u003c\/strong\u003e — The rubber body absorbs vibration and runs without lubrication, making this synchronous timing belt suitable for enclosed machines, lab equipment, and environments where chain noise or oil contamination is unacceptable.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eClosed-Loop Construction\u003c\/strong\u003e — Manufactured as a continuous loop with no mechanical joint or clip, eliminating the weak point that spliced or laced belts introduce and ensuring consistent tooth spacing around the full circumference.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- ④ TECHNICAL SPECIFICATIONS --\u003e\n\u003ch2\u003e📐 Technical Specifications — 8YU Synchronous Timing Belt\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Profile \/ Standard\u003c\/th\u003e\n\u003ctd\u003e8YU (HTD-8M curvilinear tooth profile)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Pitch\u003c\/th\u003e\n\u003ctd\u003e8mm (0.315\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Width\u003c\/th\u003e\n\u003ctd\u003e30mm (≈1.18\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Circumference\u003c\/th\u003e\n\u003ctd\u003e520mm (≈20.5\") to 2000mm (≈78.7\") — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Height\u003c\/th\u003e\n\u003ctd\u003eTypically 3.4mm (standard HTD-8M profile)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBody Material\u003c\/th\u003e\n\u003ctd\u003eNeoprene or EPDM rubber (contact us to confirm specific compound)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTension Member\u003c\/th\u003e\n\u003ctd\u003eFiberglass or steel cord (contact us to confirm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eConstruction\u003c\/th\u003e\n\u003ctd\u003eClosed loop — no joint or splice\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically −20°C to +80°C (−4°F to +176°F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLubrication Required\u003c\/th\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Pulley Profile\u003c\/th\u003e\n\u003ctd\u003e8YU \/ HTD-8M, 30mm groove width\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 belt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e \u003cstrong\u003eSpec Note:\u003c\/strong\u003e Tooth height, body compound, and tension member material are based on standard 8YU \/ HTD-8M manufacturing norms. If your application requires certified material data sheets or specific compound confirmation, please contact us before ordering.\u003c\/div\u003e\n\u003c!-- ⑤ FAQ --\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right belt length for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the center-to-center distance between your two pulleys, then calculate the required belt circumference using the standard formula: \u003cstrong\u003eL = 2C + π(D₁+D₂)\/2\u003c\/strong\u003e. This belt is available in lengths from 520mm (≈20.5\") to 2000mm (≈78.7\") in increments as small as 8mm (one tooth pitch). When in doubt, size up — a slightly longer belt can typically be accommodated by adjusting tensioner position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does \"8YU\" mean and what is the tooth pitch?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e\"8YU\" designates the belt profile: \"8\" refers to the 8mm tooth pitch (center-to-center distance between teeth), and \"YU\" (also written as \"HTD-8M\" in some catalogs) indicates the curvilinear tooth profile. This profile generally provides higher torque capacity and reduced tooth jump compared to trapezoidal profiles of the same pitch.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat load or torque can this belt handle?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eTorque capacity depends on the number of teeth in mesh, pulley diameter, and operating speed. For a 30mm-wide 8mm-pitch belt, typical continuous torque ratings are generally in the range of 20–80 Nm depending on pulley size and RPM. Consult your drive design software or contact us with your application details to confirm suitability for your specific load.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan this timing belt be used outdoors or in wet environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe rubber compound used in most 8YU synchronous belts offers moderate resistance to water, dust, and mild oils. However, prolonged exposure to UV radiation, ozone, or harsh chemicals can accelerate degradation. For outdoor or washdown applications, inspect the belt periodically and consider a cover or guard where feasible.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat pulley or sprocket do I need to match this belt?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYou need an 8YU (or HTD-8M) pulley with a 30mm belt-width groove. The pulley tooth count determines the pitch diameter — common tooth counts range from 20T to 80T for this pitch. Verify the pulley's bore size and keyway match your shaft before ordering. This belt is \u003cstrong\u003enot\u003c\/strong\u003e compatible with GT2, T5, T10, or other pitch profiles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this a standard size I can find locally, or is it a specialty belt?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe 8YU \/ HTD-8M profile is an internationally recognized standard, so matching pulleys are widely available. However, the specific circumference lengths offered here (520mm–2000mm) cover many machine sizes that are not typically stocked at local hardware stores. Ordering online ensures you get the exact length your machine requires without custom fabrication costs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I install and tension this closed-loop timing belt correctly?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSlip the belt over both pulleys with the drive disengaged. Adjust the center distance or tensioner until the belt has minimal slack — typically 2–5mm of deflection at the midpoint of the longest span under light finger pressure. Avoid over-tensioning, which accelerates bearing and belt wear. Re-check tension after the first few hours of operation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003c!-- ⑥ CTA BAR --\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your length above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"520 mm","offer_id":52368184836370,"sku":"WXB5208YU30x1","price":33.86,"currency_code":"USD","in_stock":true},{"title":"600 mm","offer_id":52368184869138,"sku":"WXB6008YU30x1","price":38.22,"currency_code":"USD","in_stock":true},{"title":"616 mm","offer_id":52368184901906,"sku":"WXB6168YU30x1","price":38.49,"currency_code":"USD","in_stock":true},{"title":"640 mm","offer_id":52368184934674,"sku":"WXB6408YU30x1","price":41.59,"currency_code":"USD","in_stock":true},{"title":"680 mm","offer_id":52368184967442,"sku":"WXB6808YU30x1","price":43.76,"currency_code":"USD","in_stock":true},{"title":"720 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