{"product_id":"htd3m-20mm-idler-timing-drive-pulleys","title":"HTD3M 20mm Idler Timing Drive Pulleys - 15 20 25 30 35 60 Tooth - 4 to 25mm Bore","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eHTD3M 20mm Idler Timing Drive Pulleys — Reliable Belt Guidance for CNC, 3D Printers \u0026amp; Automation\u003c\/h2\u003e\n\u003cp\u003eWhen a misaligned or slipping timing belt derails your CNC router mid-cut or causes layer shifts in a 3D print, the culprit is often a poorly fitted idler pulley. Engineers, makers, and automation builders who demand repeatable motion need idler pulleys that hold their position, grip the belt profile cleanly, and accept a wide range of shaft sizes without custom machining. These HTD3M 20mm idler timing drive pulleys are designed exactly for that use case.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from aluminum alloy with a flanged outer rim to keep the HTD 3M belt tracking true. The tooth width is 20mm (approximately 0.79 in), and the overall flange width is 21mm (approximately 0.83 in). Bore options span 4mm to 25mm (approximately 0.16 in to 0.98 in), and tooth counts range from 20 to 60 teeth, giving you precise pitch-diameter control across a wide range of drive ratios and belt-wrap angles.\u003c\/p\u003e\n\u003cp\u003eTypical applications include idler and tensioner positions on HTD 3M belt-driven CNC gantries, CoreXY and Cartesian 3D printer motion systems, light-duty conveyor tensioners, and robotic arm joint drives where smooth, low-backlash belt routing is critical.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for \u003cstrong\u003eHTD 3M timing belts\u003c\/strong\u003e with a 20mm width. Verify your belt pitch (3mm) and width before ordering. Bore must match your shaft or use a set-screw to secure on a smaller shaft.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These HTD3M Idler Timing Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eWide Bore Range\u003c\/strong\u003e\n\u003cp\u003eAvailable from 4mm to 25mm bore diameter, covering the most common motor and idler shaft sizes used in CNC and 3D printing builds without additional machining.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eHTD 3M Tooth Profile\u003c\/strong\u003e\n\u003cp\u003eThe curved HTD tooth form distributes belt load across a larger contact area than trapezoidal profiles, reducing tooth stress and extending belt life in continuous-duty applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003e20–60 Tooth Selection\u003c\/strong\u003e\n\u003cp\u003eChoose from 20, 22, 24, 25, 26, 28, 30, 32, 34, 35, 36, 38, 40, 50, or 60 teeth to dial in the exact pitch diameter and belt-wrap angle your drive system requires.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cstrong\u003eFlanged Rim Design\u003c\/strong\u003e\n\u003cp\u003eIntegrated flanges on both sides of the tooth face keep the HTD 3M belt centered on the pulley under lateral loads, preventing belt walk and unplanned derailment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e \u003cstrong\u003eAluminum Alloy Construction\u003c\/strong\u003e\n\u003cp\u003eMachined aluminum body keeps rotating mass low for responsive acceleration in servo and stepper-driven axes while providing adequate strength for light-to-medium duty loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eIdler \/ Tensioner Ready\u003c\/strong\u003e\n\u003cp\u003eDesigned for use without a drive key — ideal for idler and tensioner positions where the pulley spins freely on a fixed shaft or bearing, maintaining belt tension without transmitting torque.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003e📐 Technical Specifications — HTD3M Idler Timing Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Type\u003c\/th\u003e\n\u003ctd\u003eHTD 3M (3mm pitch)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Width\u003c\/th\u003e\n\u003ctd\u003e20mm (0.79 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFlange Width\u003c\/th\u003e\n\u003ctd\u003e21mm (0.83 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e20 \/ 22 \/ 24 \/ 25 \/ 26 \/ 28 \/ 30 \/ 32 \/ 34 \/ 35 \/ 36 \/ 38 \/ 40 \/ 50 \/ 60 (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e4 \/ 5 \/ 6 \/ 6.35 \/ 8 \/ 10 \/ 12 \/ 12.7 \/ 14 \/ 15 \/ 17 \/ 19 \/ 20 \/ 25mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eAluminum alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural \/ anodized (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 piece\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Securing Method\u003c\/th\u003e\n\u003ctd\u003eSet screw (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Length\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right number of teeth for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe number of teeth determines the pitch diameter of the pulley (pitch diameter = teeth × pitch \/ π). For idler and tensioner use, the tooth count affects belt-wrap angle and the minimum bend radius the belt experiences. A higher tooth count means a larger diameter and gentler belt curvature, which is better for belt longevity. Match the tooth count to the space available in your drive system and ensure the pitch diameter is large enough to avoid over-bending the belt.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore size should I select?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSelect the bore that matches your idler shaft or bearing outer diameter. Common choices are 5mm and 8mm for 3D printer idler pins, and 6mm, 8mm, or 10mm for CNC gantry idler shafts. If you plan to mount the pulley on a bearing, measure the bearing's outer diameter and choose the matching bore. For shaft-mounted use with a set screw, the bore should match the shaft diameter exactly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these pulleys compatible with standard HTD 3M timing belts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. These pulleys are machined to the HTD 3M tooth profile with a 3mm pitch and a 20mm tooth width. They are compatible with any standard HTD 3M timing belt that is 20mm wide. Do not use with MXL, GT2, or other belt profiles — the tooth geometry is not interchangeable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are these pulleys for continuous-duty use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe aluminum alloy construction provides adequate strength for light-to-medium duty idler and tensioner applications such as CNC routers, 3D printers, and small robotic joints. For heavy industrial conveyor or high-torque drive applications, verify the load against the material's yield strength. As idler pulleys, they do not transmit torque, so the primary load is radial belt tension.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these pulleys resist corrosion?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy naturally forms a thin oxide layer that provides moderate corrosion resistance in typical indoor workshop and lab environments. For humid or outdoor environments, an anodized finish variant offers improved surface protection. Avoid prolonged exposure to salt spray or strong acids without additional protective coating.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these as drive pulleys instead of idlers?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese pulleys are designed primarily for idler and tensioner use. They can be used as drive pulleys if secured firmly to a shaft with the set screw, but they do not include a keyway. For high-torque drive applications, a keyed drive pulley is recommended to prevent slipping under load. For low-torque or light-duty drives, the set screw may be sufficient — assess your torque requirements before use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the 6mm and 6.35mm bore options?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe 6.35mm bore corresponds to 1\/4 inch, which is a common shaft size in imperial-standard hardware and some stepper motors. If your shaft is metric 6mm, choose the 6mm bore. If your shaft is 1\/4 inch (imperial), choose 6.35mm. Using the wrong bore will result in either a loose fit or an inability to mount the pulley.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your \u003cstrong\u003etooth count, bore size, and tooth width \u0026amp; amount\u003c\/strong\u003e above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"20Teeth \/ 4mm \/ 21mm \u0026 1","offer_id":52444910321938,"sku":"GLFBLFF3M20TC21D4AFx1","price":12.82,"currency_code":"USD","in_stock":true},{"title":"20Teeth \/ 5mm \/ 21mm \u0026 1","offer_id":52444910354706,"sku":"GLFBLFF3M20TC21D5AFx1","price":12.82,"currency_code":"USD","in_stock":true},{"title":"20Teeth \/ 6mm \/ 21mm \u0026 1","offer_id":52444910387474,"sku":"GLFBLFF3M20TC21D6AFx1","price":12.82,"currency_code":"USD","in_stock":true},{"title":"20Teeth \/ 6.35mm \/ 21mm \u0026 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